NASA Planetary Data System Microwave Subnode of the Geosciences Node Software Interface Specification PDS-GEO-SCVDRCD Magellan Surface Characteristics Vector Data Record on Compact Disk Read-Only Memory prepared by Center for Space Research Massachusetts Institute of Technology 70 Vassar Street Cambridge, MA 02139-4307 617-253-6485 from data supplied by Center for Radar Astronomy Stanford University Durand Building, Room 232 Stanford, CA 94305-4055 415-423-3525 Version 1.0 January 1, 1995 CONTENTS 1. OVERVIEW ........................................................ 1 1.1. Scope ................................................... 1 1.2. Applicable Documents .................................... 1 1.3. System Siting ........................................... 1 1.3.1. Interface Location and Medium ................... 1 1.3.2. Data Sources and Destinations ................... 2 1.3.3. Generation Method and Frequency ................. 2 1.4. Assumptions and Constraints ............................. 2 1.4.1. Usage Constraints ............................... 2 1.4.2. Documentation Conventions ....................... 2 1.4.3. Time Standards .................................. 3 2. INTERFACE CHARACTERISTICS ....................................... 4 2.1. Hardware Characteristics and Limitations ................ 4 2.1.1. Special Equipment and Device Interfaces ......... 4 2.1.2. Special Set-Up Requirements ..................... 4 2.2. Volume and Size ......................................... 4 2.3. Labeling and Identification ............................. 4 2.3.1. External Labels ................................. 4 2.3.2. Internal Labels ................................. 4 2.3.3. Interface Medium Characteristics ................ 4 2.4. Backup and Duplicates ................................... 4 3. STRUCTURE AND ORGANIZATION OVERVIEW ............................. 6 3.1. Disk Organization ....................................... 6 3.1.1. Root Directory .................................. 6 3.1.2. CATALOG Directory ............................... 6 3.1.3. DOCUMENT Directory .............................. 7 3.1.4. GEOMETRY Directory .............................. 7 3.1.5. INDEX Directory ................................. 7 3.1.6. LABEL Directory ................................. 8 3.1.7. SOFTWARE Directory .............................. 8 3.1.8. Data Directories ................................ 9 3.2. Formats ................................................. 9 3.3. File Naming Conventions ................................. 9 3.3.1. PDS Labels ...................................... 10 3.3.2. Document files .................................. 11 3.3.3. Tabular Files ................................... 11 3.3.4. Catalog files ................................... 11 3.3.5. Data files ...................................... 11 4. DETAILED INTERFACE SPECIFICATIONS ............................... 13 4.1. Root Files .............................................. 13 4.1.1. AAREADME.TXT File ............................... 13 4.1.2. ERRATA.TXT File ................................. 13 4.1.3. VOLDESC.CAT File ................................ 14 4.2. Static Directories ...................................... 16 4.2.1. CATALOG Directory ............................... 16 4.2.2. DOCUMENT Directory .............................. 18 PDS-GEO-SCVDRCD v 1.0 Page i 4.2.3. INDEX Directory ................................. 19 4.2.4. LABEL Directory ................................. 20 4.2.5. SOFTWARE Directory .............................. 23 4.3. Data Directories ........................................ 25 4.3.1. ANFnnnnn.v ...................................... 26 4.3.2. ANFnnnnn.LBL .................................... 26 4.3.3. EDFnnnnn.v ...................................... 26 4.3.4. EDFnnnnn.LBL .................................... 26 4.3.5. NFFnnnnn.v ...................................... 27 4.3.6. NFFnnnnn.LBL .................................... 27 4.3.7. OHFnnnnn.v ...................................... 27 4.3.8. OHFnnnnn.LBL .................................... 27 4.3.9. OIFnnnnn.v ...................................... 27 4.3.10. OIFnnnnn.LBL .................................... 27 4.3.11. SIFnnnnn.v ...................................... 28 4.3.12. SIFnnnnn.LBL .................................... 28 5. SUPPORT STAFF AND COGNIZANT PERSONNEL ........................... 29 A. EXAMPLE PDS LABELS .............................................. 31 A.1. ANF00376.LBL Example .................................... 31 A.2. CUMINDEX.LBL Example .................................... 32 A.3. EDF00376.LBL Example .................................... 34 A.4. GMF00376.LBL Example .................................... 35 A.5. INDEX.LBL Example ....................................... 36 A.6. NFF00376.LBL Example .................................... 38 A.7. OHF00376.LBL Example .................................... 39 A.8. OIF00376.LBL Example .................................... 40 A.9. SIF00376.LBL Example .................................... 41 B. FORMAT FILES .................................................... 44 B.1. SCVDRANF.FMT Example .................................... 44 B.2. SCVDRANH.FMT Example .................................... 59 B.3. SCVDREDF.FMT Example .................................... 65 B.4. SCVDREDH.FMT Example .................................... 75 B.5. SCVDRGMF.FMT Example .................................... 82 B.6. SCVDRGMH.FMT Example .................................... 88 B.7. SCVDRIMF.FMT Example .................................... 90 B.8. SCVDRIMH.FMT Example .................................... 101 B.9. SCVDRNFF.FMT Example .................................... 104 B.10. SCVDRNFH.FMT Example .................................... 108 B.11. SCVDROHF.FMT Example .................................... 113 C. EXAMPLES OF OTHER FILES ......................................... 120 C.1. AAREADME.TXT Example .................................... 120 C.2. CATINFO.TXT Example ..................................... 125 C.3. DATASET.CAT Example ..................................... 126 C.4. DOCINFO.TXT Example ..................................... 134 C.5. GEOMINFO.TXT Example .................................... 134 C.6. INDEX.TAB Example ....................................... 135 C.7. INDXINFO.TXT Example .................................... 135 C.8. INST.CAT Example ........................................ 136 C.9. INSTHOST.CAT Example .................................... 140 C.10. LABINFO.TXT Example ..................................... 143 C.11. MISSION.CAT Example ..................................... 145 C.12. PERSONEL.CAT Example .................................... 156 PDS-GEO-SCVDRCD v 1.0 Page ii C.13. REFS.CAT Example ........................................ 158 C.14. VOLDESC.CAT Example ..................................... 164 FIGURES Figure 3-1. Example SCVDRCD Directory Structure ........................ 6 Figure 4-1. Example Label for *.TXT Files .............................. 13 Figure 4-2. Example VOLDESC.CAT File ................................... 14 Figure 4-3. Example SCVDRCD Data Directory Structure ................... 26 PDS-GEO-SCVDRCD v 1.0 Page iii PREFACE __________________________________________________________________________ | | | DOCUMENT CHANGE LOG | |_________________________________________________________________________| | REVISION | REVISION | SECTION | | | NUMBER | DATE | AFFECTED | REMARKS | |________________|_________________|_________________|____________________| | | | | | | 1.0 | 01/01/95 | All | New document | |________________|_________________|_________________|____________________| __________________________________________________________________________ | | | ITEMS TO BE DETERMINED | |_________________________________________________________________________| | REVISION | SECTION | | | | NUMBER | AFFECTED | ITEM DESCRIPTION | RESOLUTION | |______________|________________|_______________________|_________________| | | | | | | none | | | | |______________|________________|_______________________|_________________| PDS-GEO-SCVDRCD v 1.0 Page iv DISTRIBUTION JPL/Magellan Thompson, T.W...........230-260 Thomas.W.Thompson@jpl.nasa.gov Saunders, R.S...........230-260 ssaunders@sl.ms.ossa.hq.nasa.gov Conner, D.L.............230-260 dconner@gllsvc.jpl.nasa.gov Senske, D...............230-260 David.A.Senske@ccmail.jpl.nasa.gov JPL/SFDU Control Authority Grimes, J...............301-345 jimg@bongo.jpl.nasa.gov Khatchadourian, J.......301-345 jacob@binky.jpl.nasa.gov PDS/JPL Joyner, R..............525/3610 rjoyner@jplpds.jpl.nasa.gov PDS/Washington University Arvidson, R.E...Campus Box 1169 arvidson@wuddy.wustl.edu Stanford University Simpson, R...........Durand 232 rsimpson@nova.stanford.edu PDS-GEO-SCVDRCD v 1.0 Page v ACRONYMS AND ABBREVIATIONS ALT-EDR Altimetry Experiment Data Record (tape) ANF Altimetry Inversion File of the SCVDR ANSI American National Standards Institute ARCDR Altimetry and Radiometry Composite Data Record ASCII American Standard Code for Information Interchange BPI Bits Per Inch C-BIDR Compressed Basic Image Data Record (tape) CCSDS Consultative Committee for Space Data Systems CCT Computer Compatible Tape CD-WO Compact Disk - Write Once CD Compact Disk dB Decibel DMAT Data Management and Archive Team DOS Disk Operating System EDF Emissivity Data File of the SCVDR EDR Experiment Data Record EOF End of File F-BIDR Full Resolution Basic Image Data Record (tape) GMF G-Matrix File of the SCVDR IAU International Astronomical Union IEEE Institute of Electrical and Electronic Engineering ISO International Standards Organization J2000 IAU Official Time Epoch JPL Jet Propulsion Laboratory K Degrees Kelvin km Kilometers LSB Least Significant Byte MB Megabytes MGN Magellan (formerly Venus Radar Mapper) MIT Massachusetts Institute of Technology MSB Most Significant Byte NAIF Navigation and Ancillary Information Facility NASA National Aeronautics and Space Administration NFF Altimetry Inversion Fit File of the SCVDR NSI NASA Science Internet NSSDC National Space Science Data Center ODL Object Definition Language (PDS) OHF Orbit Header File of the SCVDR OIF Oblique Sinusoidal Equal Area Image Data File of the SCVDR PDS Planetary Data System PSG Project Science Group ROM Read-Only Memory SAB SAR/Altimeter Burst SAR Synthetic Aperture Radar SCET Spacecraft Event Time (TDB or UTC) SCLK Spacecraft Clock (time) SCVDR Surface Characteristics Vector Data Record SFDU Standard Formatted Data Unit SFOC Space Flight Operations Center (JPL) SIF Sinusoidal Equal Area Image Data File of the SCVDR SIS Software Interface Specification SPARC Sun Scalable Processor Architecture PDS-GEO-SCVDRCD v 1.0 Page vi SU Stanford University tar (UNIX) tape archiver utility TBD To Be Determined TDB Baricentric Dynamical (Ephemeris) Time UNIX operating system UTL Universal Resource Locator (World Wide Web) UTC Coordinated Universal Time VBF85 Venus Body Fixed Coordinates, adopted by the IAU in 1985 VBF Venus Body-Fixed coordinate system VME Venus Mean Equator coordinate system VRM Venus Radar Mapper (now Magellan) VTF Volume Trailer File of the SCVDR PDS-GEO-SCVDRCD v 1.0 Page vii PDS-GEO-SCVDRCD v 1.0 Page viii CHAPTER 1 OVERVIEW This Software Interface Specification (SIS) describes the format and content of the Magellan Surface Characteristics Vector Data Record on Compact-Disk Read-Only Memory Product (SCVDRCD). This product is the permanent archive ver- sion of the Surface Characteristics Vector Data Record (SCVDR) product that was written to 8mm computer tape during the radar mapping phase of the Magel- lan mission. The SCVDRCD combines the data files from the SCVDR tapes with PDS labels, catalog files, and tables. The SCVDRCD is a deliverable product to the Planetary Data System (PDS) and to the National Space Science Data Center (NSSDC). The formats of all files in the SCVDRCD are based on PDS standards (Version 3). 1.1. Scope The specifications in this document apply to all volumes containing SCVDRCD data produced at MIT. This document provides a detailed description of the SCVDRCD interface. 1.2. Applicable Documents (1) ISO 9660-1988. Information Processing - Volume and File Structure on CD- ROM for Information Exchange, April 15, 1988. (2) Planetary Data System Standards Reference, JPL D-7669, version 3.1, August 3, 1994 (3) Planetary Science Data Dictionary, JPL D-7116, Rev. C, November 20, 1992 (4) Planetary Data System, Data Preparation Workbook, JPL Publication D-7669, Part 1, Version 3.0, April 21, 1993. (5) Simpson, R.A., M.J. Maurer, and E. Holmann, Stanford Magellan Data Pro- cessing System, (in preparation). (6) SU-MGN-SCVDR. Surface Characteristics Vector Data Record Software Inter- face Specification, Simpson, R.A., Twicken, J.D., and Maurer, M.J., Center for Radar Astronomy, Stanford University, v 1.0, October 1, 1992. Copies of this document exist in the DOCUMENT directory of all SCVDRCD volumes; in ASCII text as SCVDR.ASC and in PostScript as SCVDR.PS. 1.3. System Siting 1.3.1. Interface Location and Medium SCVDRCD volumes are created at MIT using hardware belonging to the Microwave Subnode of the PDS Geosciences Node, with a Young Minds CD-Studio compact disk authoring subsystem. All volumes intended for delivery to PDS shall be on CD-WO media. PDS-GEO-SCVDRCD v 1.0 Page 1 1.3.2. Data Sources and Destinations Each SCVDRCD volume is a collection of products representing, derived from, or needed to analyze a range of orbits of Magellan surface characteristics vector data. These data were derived from Magellan ALT-EDR, C-BIDR, and F-BIDR pro- ducts by the Surface Property Data Processing Team at Stanford University [5], and were published on SCVDR product tapes [6]. The SCVDR files have been sorted by ascending orbit number, replaced files have been omitted, and the remainder written to CD-WO by ascending volume number. The number of orbits on each SCVDRCD disk is therefore variable. One copy of each CD-WO archive volume is delivered using the most appropriate means to the National Space Science Data Center (NSSDC), a second copy is sent to Stanford University Center for Radar Astronomy, and a third copy is retained at the MIT Microwave Subnode of the Planetary Data System (PDS). 1.3.3. Generation Method and Frequency Each SCVDRCD volume is produced in several stages. First, the SCVDR data files are copied from 8mm archive tape into magnetic disk using the UNIX "tar" pro- gram. Then a PDS detached label is created for each data file using the UNIX perl script "write_cbidr_cd". Next, the CD-WO is pre-mastered using the Young Minds "makedisc" command. Finally, the CD-Studio hardware is commanded to write one or more CD-WO disks. 1.4. Assumptions and Constraints 1.4.1. Usage Constraints Access to the SCVDRCD volumes will be determined by the Planetary Data System (PDS) and by the National Space Science Data Center (NSSDC). 1.4.2. Documentation Conventions 1.4.2.1. Data Format Descriptions Data are stored in fields of 8-, 16-, and 32-bit signed and unsigned integers, 32-bit and 64-bit floats, and as character strings. Integers are stored in most-significant-byte (MSB) format [2]; the first byte contains the most sig- nificant bits, while the last contains the least significant bits. Refer to the applicable documents for details. Floats use IEEE-754 format and are are stored in MSB order (i.e., the most significant mantissa bytes precede the less significant bytes.) If a field is described as containing "n" bytes of ASCII character string data, this implies that the leftmost (lowest numbered) byte contains the first character, the next lowest byte contains the next character, and so forth. Character strings are written to CD-WO with lower numbered bytes preceding higher numbered bytes. 1.4.2.2. Limits of This Document This document applies only to SCVDRCD volumes. 1.4.2.3. Typographic Conventions This document has been formatted for simple electronic file transfer and display. Line lengths are limited to 80 ASCII characters, including line del- imiters. The last two characters on each line are the carriage-return (ASCII PDS-GEO-SCVDRCD v 1.0 Page 2 13) and the line-feed (ASCII 10). No special fonts or structures are included within the file. Constant width characters are assumed for display. Hard copy pagination at the rate of 66 lines per page is assumed. For page numbers consistent with those shown in the Table of Contents, a break in page number- ing immediately before "Chapter 1. OVERVIEW" will be required. 1.4.3. Time Standards Within SCVDRCD label files, times are expressed as a string of 19 or 23 ASCII characters YYYY-MM-DDThh:mm:ss[.fff] where "-", "T", ":", and "." are fixed delimiters; "YYYY" is the year "19nn" or "20nn"; "MM" is a two-digit month of year; "DD" is a two-digit day of month; "T" separates the date and time segments of the string; "hh" is hour of day; "mm" is the minutes of hour (00-59); "ss" is the seconds of minute (00- 59); and ".fff" gives the fractional seconds. The data type "TIME" is assigned to this format. When only the date is required the 10-character string YYYY-MM-DD may be substituted. The data type "DATE" is assigned to this format. PDS-GEO-SCVDRCD v 1.0 Page 3 CHAPTER 2 INTERFACE CHARACTERISTICS 2.1. Hardware Characteristics and Limitations 2.1.1. Special Equipment and Device Interfaces SCVDRCD volumes conform to ISO 9660 standards for CD-ROM [1]. Users of the volumes must have access to systems which can read these media. 2.1.2. Special Set-Up Requirements None. 2.2. Volume and Size Each SCVDRCD volume contains a set of data and ancillary files representing one or more Magellan orbits. The maximum size of SCVDRCD data files will be approximately 600 Mbytes. SCVDRCD disks may be slightly larger than this due to the additional PDS index table and label files. 2.3. Labeling and Identification 2.3.1. External Labels Each SCVDRCD volume bears a label using the following format: ACRONYM.SEQUENCE;VERSION where ACRONYM _ SCVDRCD SEQUENCE _ a three digit number indicating the order in which the CD-WO volumes were produced. VERSION _ A single digit determining version number of the CD-WO volume. "1" is the original version. For example, SCVDRCD.004;2 is the second version of the fourth SCVDRCD volume. 2.3.2. Internal Labels The contents of each SCVDRCD volume will be labeled in accordance with PDS standards. Labeling is described further in subsequent sections. 2.3.3. Interface Medium Characteristics Each SCVDRCD volume conforms to ISO 9660 standards [1]. The quantity of data stored is no more than 650 MB per disk. 2.4. Backup and Duplicates Three copies will be made of each SCVDRCD volume. One copy will be retained at the PDS Microwave Subnode at MIT; a second will be sent to the Center for PDS-GEO-SCVDRCD v 1.0 Page 4 Radar Astronomy at Stanford University; the third copy will be sent to NSSDC for archival. PDS-GEO-SCVDRCD v 1.0 Page 5 CHAPTER 3 STRUCTURE AND ORGANIZATION OVERVIEW 3.1. Disk Organization Each SCVDRCD volume contains a CATALOG directory, a DOCUMENT directory, a GEOMETRY directory, an INDEX directory, a LABEL directory, a SOFTWARE direc- tory, and one or more data directories (Figure 3-1). ROOT | +--+--+----------------+--+-------+------+--+----------------+ | | | | | | | | | | [CATALOG] | [DOCUMENT] | [LABEL] [SOFTWARE] | | | | | | | | | | |- CATINFO.TXT | |- DOCINFO.TXT | |- LABINFO.TXT |- MAKEFILE.MAK | | |- DATASET.CAT | |- SCVDR.ASC | |- SCVDRANF.FMT |- SCV_RDR.C | | |- INSTHOST.CAT | |- SCVDR.PS | |- SCVDRANH.FMT |- SCV_RDR.I | | |- MISSION.CAT | |- SCVDRCD.ASC | |- SCVDREDF.FMT |- SCVDR.H | | |- PERSONEL.CAT | +- SCVDRCD.PS | |- SCVDREDF.FMT |- SCVCDSCN.PL | | |- REFS.CAT | | |- SCVDRGMF.FMT |- SCVPARSE.C | | +- INST.DAT | | |- SCVDRGMH.FMT |- SCVPARSE.H | | | | |- SCVDRIMF.FMT |- SCVPARSE.I | [INDEX] [GEOMETRY] | |- SCVDRIMH.FMT |- SOFTINFO.TXT | | | | |- SCVDRNFF.FMT |- TESTANF.C | |- CUMINDEX.LBL |- GEOMINFO.TXT | |- SCVDRNFH.FMT |- TESTEDF.C | |- CUMINDEX.TAB |- GMFnnnnn.v | +- SCVDROHF.FMT |- TESTGMF.C | |- INDEX.LBL +- GMFnnnnn.LBL | |- TESTIF.C | |- INDEX.TAB | |- TESTNFF.C | +- INDXINFO.TXT | TYPES.H -+- TESTOHF.C | | |- AAREADME.TXT +-------------+-------------+------------+ |- ERRATA.TXT | | | | +- VOLDESC.TXT [Snnnn_vv] [Snnnn_vv] [Snnnn_vv] ... Figure 3-1. Example SCVDRCD Directory Structure 3.1.1. Root Directory The root directory contains the following files: AAREADME.TXT terse description of volume contents [2]. ERRATA.TXT cumulative list of errors on this and on previous SCVDRCD volumes. VOLDESC.CAT volume object definition [2]. 3.1.2. CATALOG Directory The CATALOG directory contains the following files: PDS-GEO-SCVDRCD v 1.0 Page 6 CATINFO.TXT text description of the directory contents [2]. DATASET.CAT PDS data set template. INST.CAT PDS instrument template. INSTHOST.CAT PDS instrument host template. MISSION.CAT PDS mission template. PERSONEL.CAT PDS personnel template. REFS.CAT PDS reference template. 3.1.3. DOCUMENT Directory The DOCUMENT directory contains the following files: SCVDR.ASC a copy of the SCVDR SIS document in ASCII characters, suitable for display or printing at 66 lines per page with up to 78 constant-width characters per line. SCVDR.LBL PDS label for the text of the SCVDR SIS (SCVDR.ASC) and for its PostScript version (SCVDR.PS). SCVDR.PS a copy of the SCVDR SIS document in PostScript format, suitable for previewing on a high-resolution graphics terminal or direct printing on a laser printer or photo-typesetter. SCVDRCD.ASC a copy of this SIS document in ASCII characters, suitable for display or printing at 66 lines per page with up to 78 constant-width characters per line. SCVDRCD.LBL PDS label for the text of this SIS (SCVDRCD.ASC) and for its PostScript version (SCVDRCD.PS). SCVDRCD.PS a copy of this SIS document in PostScript format, suitable for previewing on a high-resolution graphics terminal or direct printing on a laser printer or photo-typesetter. DOCINFO.TXT text description of the directory contents [2]. 3.1.4. GEOMETRY Directory The GEOMETRY directory contains the following files: GEOMINFO.TXT text description of the directory contents [2]. GMFnnnnn.LBL PDS label for the G-matrix data file GMFnnnnn.v. GMFnnnnn.v A data file containing geometrical inversion matrices (G- matrices) that were used to generate one or more ANF data files on this volume. The specific ANF files are those listed in the INDEX.TAB file in the INDEX directory with a GEOMETRY_FILE_NAME column entry of this value. 3.1.5. INDEX Directory The INDEX directory contains the following files: PDS-GEO-SCVDRCD v 1.0 Page 7 CUMINDEX.LBL PDS label for the cumulative volume index (CUMINDEX.TAB) [2]. CUMINDEX.TAB index in tabular form for all volumes in the SCVDRCD [2]. INDEX.LBL PDS label for the volume index (INDEX.TAB). Identifies the volume index and describes structure of the index table [2]. INDEX.TAB volume index in tabular form [2]. INDXINFO.TXT text description of the directory contents [2]. 3.1.6. LABEL Directory The LABEL directory contains the following files: SCVDRANF.FMT Description of the binary data records in the ANFnnnnn.v files. SCVDRANH.FMT Description of the binary header records in the ANFnnnnn.v files. SCVDREDF.FMT Description of the binary data records in the EDFnnnnn.v files. SCVDREDH.FMT Description of the binary header records in the EDFnnnnn.v files. SCVDRGMF.FMT Description of the binary data records in the GMFnnnnn.v files. SCVDRGMH.FMT Description of the binary header records in the GMFnnnnn.v files. SCVDRIMF.FMT Description of the binary data records in the SIFnnnnn.v and OIFnnnnn.v files. SCVDRIMH.FMT Description of the binary header records in the SIFnnnnn.v and OIFnnnnn.v files. SCVDRNFF.FMT Description of the binary data records in the NFFnnnnn.v files. SCVDRNFH.FMT Description of the binary header records in the NFFnnnnn.v files. SCVDROHF.FMT Description of the binary header records in the OHFnnnnn.v files. LABINFO.TXT text description of the directory contents [2]. 3.1.7. SOFTWARE Directory The SOFTWARE directory contains the following files: MAKEFILE.MAK Script used by the UNIX "make" command to generate executables from these source files. SCV_RDR.C Low level routines to read SCVDR data files into the structures defined in SCVDR.H SCV_RDR.I Function definition skeleton for SCV_RDR.C routines. SCVDR.H Definition of SCVDR data structures. PDS-GEO-SCVDRCD v 1.0 Page 8 SCVDRSCN.PL A Perl script to list contents of SCVDR data files. This file also functions as its own UNIX manual and can be printed by the UNIX commands "nroff -man scvdrscn.pl" and "troff -man scvdrscn.pl". SCVPARSE.C Low level routines to parse SFDU structures. SCVPARSE.H Definition of SFDU header structures. SCVPARSE.I Function definition skeleton for SCVPARSE.C routines. SOFTINFO.TXT text description of the directory contents [2]. TESTANF.C A program that illustrates how to read an ANF - altimetry inver- sion file. TESTEDF.C A program that illustrates how to read an EDF - emissivity file. TESTGMF.C A program that illustrates how to read a GMF - G-matrix file. TESTIF.C A program that illustrates how to read a SIF or OIF - image data file. TESTNFF.C A program that illustrates how to read a NFF - inversion fit file. TESTOHF.C A program that illustrates how to read an OHF - orbit header file. TYPES.H Miscellaneous SCVDR definitions. Note: all lines in these files have been padded on the right with blanks and terminated with an ASCII carriage return and linefeed in columns 79 and 80. It may be necessary to remove one or more of these characters in order to compile these sources on particular operating systems. 3.1.8. Data Directories Each SCVDRCD volume contains directories for one or more orbits of altimetry, image, and emissivity data from SCVDR tapes. Data directories are named Snnnn_vv where "nnnn" is the orbit number, and "vv" is the version number inherited from the original SCVDR product. 3.2. Formats SCVDRCD volumes conform to the ISO 9660 level 1 Interchange Standard CD-WO format [1], which is compatible with common computer systems including MS-DOS, Macintosh, SunOS, and VMS. Data that comprise the SCVDRCD volumes are formatted in accordance with Plane- tary Data System specifications [2-4]. 3.3. File Naming Conventions In this document and on the disks themselves, file and directory names are in upper case characters. This ensures compatibility with operating systems in which these names are case insensitive (e.g., VMS and DOS) and operating PDS-GEO-SCVDRCD v 1.0 Page 9 systems in which names are automatically translated into one case or the other (e.g., Unix and MacOS). Within disk directories the characters ";1" are appended to all file names. VMS excepted, most operating systems will hide these suffixes from users. 3.3.1. PDS Labels All files contained on SCVDRCD volumes are accompanied by PDS labels [2-4]. The label can either be prefixed to the associated primary file, or "detached", in which case the label becomes a file in its own right with the same name as the primary file except for the suffix ".LBL". Detached label files will be located in the same directory as the primary file. PDS labels, whether prefixed to or detached from their primary file, provide descriptive information about the associated file. The PDS label is an object-oriented structure consisting of sets of "keyword=value" declarations. The object to which the label refers (e.g. HEADER, TABLE, etc.) is denoted by a statement of the form: ^object = location in which the carat character (^, also called a pointer in this context) indi- cates where to find the object. In a prefixed label, the location is an integer representing the starting record or byte number of the object, where the counting starts from record or byte number 1. In a detached label, the location denotes the name of the file containing the object, along with the starting record or byte number if there is more than one object. For example: ^TABLE_HEADER = ("ANF00376.1",21) ^TABLE = ("ANF00376.1",1025 ) indicates that the TABLE object begins at byte 1025 of the file ANF00376.1, in the same directory as the detached label file. Below is a list of the possi- ble formats for the ^object definition. ^object = n ^object = n ^object = "filename.ext" ^object = ("filename.ext",n) ^object = ("filename.ext",n) where n is the starting record or byte number of the object, counting from the beginning of the file (record 1 or byte 1), indicates that the number given is in units of bytes; default is RECORDS, filename is the (up to) 8 character, alphanumeric upper-case file name, ext is the 3 character upper-case file extension. All lines in detached label files are 80 bytes long, padded on the right with blanks to a length of 78 bytes, and ending with a carriage return character (ASCII 13) followed by a line feed character (ASCII 10) in the last byte. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are PDS-GEO-SCVDRCD v 1.0 Page 10 offset from the start of the label by a multiple of 80 bytes. 3.3.2. Document files Document files (.TXT suffix) may exist in the root, CATALOG, DOCUMENT, GEOMETRY, INDEX, LABEL, and SOFTWARE directories. These are ASCII files with embedded PDS labels which employ the TEXT object. All records in document files are 80-bytes in length, with a carriage return character (ASCII 13) in the next-to-last byte and a line feed character (ASCII 10) in the last byte. The first two lines are an exception: the first contains a 40-byte SFDU aggre- gate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. 3.3.3. Tabular Files Tabular files (.TAB suffix) exist in the INDEX directory (where they are ASCII files formatted for direct reading into many database management systems). ASCII tabular files consist of data "fields" separated by commas. Character fields are also enclosed in double quotation marks (") and are padded with spaces to keep quotation marks in the same columns of successive records. Character fields are left justified, and numeric fields are right justified. The "start byte" and "bytes" values listed in the labels do not include the commas between fields or the quotation marks surrounding character fields. The records in tabular files have fixed length. Where necessary, a space char- acter (ASCII 32) is appended to the record to make it of even length, and the last two bytes of each record contain the ASCII carriage return and line feed characters. This allows a table to be treated as a fixed length record file on computers that support this file type and as a text file with embedded line delimiters on those that do not. All tabular files are accompanied by descriptive, detached PDS labels. The PDS label has the same name as the data file it describes, except for the extension .LBL. For example, the file INDEX.TAB is accompanied by the detached label file INDEX.LBL in the same INDEX directory. 3.3.4. Catalog files Catalog files (suffix .CAT) exist in the root and in the CATALOG directory. They are formatted in an object-oriented structure consisting of sets of "keyword=value" declarations. VOLDESC.CAT in the root provides an overview of the contents of the volume in the form of a completed PDS template. The files in the CATALOG directory provides a top-level understanding of the mission, instrument and data set. They are presented in the form of completed PDS templates [4]. See section 4.2 for further details. 3.3.5. Data files Data files (numeric suffix) exist in the per-orbit data directories and in the GEOMETRY directory. They are described in detail in section 4.3, below, and in the series of applicable documents listed in section 1.2, above. They have been copied directly from SCVDR product tapes without reformatting, except that ASCII carat characters (ASCII 94) have been appended where necessary to set their length to a multiple of 32500 bytes. PDS-GEO-SCVDRCD v 1.0 Page 11 Within the files, the data fields are written without regard for the 32,500- byte record boundaries, i.e. they are written as a data stream. All data files copied from the SCVDR tapes contain SFDU labels, and varying length data record aggregates are themselves delimited by R-type SFDU marker labels [4]. The data files are as follows: ANFnnnnn.v Altimetry Inversion File EDFnnnnn.v Emissivity Data File GMFnnnnn.v Geometry Matrix (G-Matrix) File NFFnnnnn.v Altimetry Inversion Fit File OHFnnnnn.v Orbit Header File OIFnnnnn.v Oblique Sinusoidal Image File SIFnnnnn.v Sinusoidal Image File All data files are accompanied by detached PDS label files, whose first 8 characters are identical to the data files they represent, and whose last 3 characters are LBL. PDS-GEO-SCVDRCD v 1.0 Page 12 CHAPTER 4 DETAILED INTERFACE SPECIFICATIONS 4.1. Root Files 4.1.1. AAREADME.TXT File The AAREADME.TXT file contains terse volume content and format information. The file has an attached PDS label of the form shown in Figure 4-1. This is an ASCII file with 80-byte records. Each line is terminated with a carriage- return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM SPACECRAFT_NAME = MAGELLAN TARGET_NAME = VENUS OBJECT = TEXT PUBLICATION_DATE = 1995-01-01 NOTE = "MAGELLAN SCVDR ARCHIVE CD-WO" END_OBJECT = TEXT Figure 4-1. Example Label for *.TXT Files Labeling requirements applicable to Figure 4-1 are described in [2]; keywords are defined in [3]. For this application, the only keywords that change are PUBLICATION_DATE the date in YYYY-MM-DD format on which the file was created or last modified (see Section 1.5.3). NOTE a brief description of the file, including a title if avail- able. 4.1.2. ERRATA.TXT File The ERRATA.TXT file contains general information about errors on this, and previous, volumes of the SCVDRCD product. This is an ASCII file with 80 byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. PDS-GEO-SCVDRCD v 1.0 Page 13 4.1.3. VOLDESC.CAT File VOLDESC.CAT contains a description of the contents of this volume in a PDS format readable by both humans and computers. This is an ASCII file with 80 byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a mul- tiple of 80 bytes. Figure 4-2 shows a sample VOLDESC.CAT file for the first SCVDRCD volume. CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 OBJECT = VOLUME VOLUME_SERIES_NAME = "MISSION TO VENUS" VOLUME_SET_NAME = "MAGELLAN RADAR DATA PRODUCT" VOLUME_SET_ID = "USA_NASA_PDS_MG_2101" VOLUMES = UNK VOLUME_NAME = "MAGELLAN SURFACE CHARACTERISTICS VECTOR DATA RECORD" VOLUME_ID = "MG_2101" VOLUME_VERSION_ID = "VERSION 1" PUBLICATION_DATE = 1995-01-01 DATA_SET_ID = "MGN-V-RDRS-5-SCVDR-V1.0" VOLUME_FORMAT = "ISO-9660" MEDIUM_TYPE = "CD-WO" DESCRIPTION = "This volume contains Magellan SCVDR (Surface Characteristics Vector Data Record) products. It also contains documentation files that describe the SCVDRs." MISSION_NAME = "MAGELLAN" SPACECRAFT_NAME = "MAGELLAN" SPACECRAFT_ID = MGN OBJECT = DATA_PRODUCER INSTITUTION_NAME = "STANFORD UNIVERSITY" FACILITY_NAME = "CENTER FOR RADAR ASTRONOMY" FULL_NAME = "DR. G. LEONARD TYLER" ADDRESS_TEXT = "STARLAB DURAND BLDG, ROOM 232 STANFORD, CALIFORNIA, 94305-4055, USA" END_OBJECT = DATA_PRODUCER OBJECT = CATALOG ^DATA_SET_CATALOG = "DATASET.CAT" ^INSTRUMENT_CATALOG = "INST.CAT" ^INSTRUMENT_HOST_CATALOG = "INSTHOST.CAT" ^MISSION_CATALOG = "MISSION.CAT" ^PERSONNEL_CATALOG = "PERSONEL.CAT" ^REFERENCE_CATALOG = "REFS.CAT" END_OBJECT = CATALOG END_OBJECT = VOLUME END Figure 4-2. Example VOLDESC.CAT File PDS-GEO-SCVDRCD v 1.0 Page 14 4.1.3.1. Keywords and Values Keywords in Figure 4-2 are defined in [3]. They are used in this application as follows: PDS_VERSION_ID The version of PDS standards to which this volume adheres; set to "PDS3". VOLUME_SERIES_NAME The formal name that describes a broad categorization of data products. For the SCVDRCD, set to "MISSION TO VENUS" VOLUME_SET_NAME The formal name describing one or more volumes con- taining a single data set or a collection of related data sets. For the SCVDRCD, set to "MAGELLAN RADAR DATA PRODUCT" VOLUME_SET_ID Identification of a data volume or a set of archive data volumes. For the SCVDRCD, set to "USA_NASA_JPL_ACRONYM_SEQUENCE" where ACRONYM and SEQUENCE are defined in Section 2.3.1. See also VOLUME_ID, below. VOLUMES The number of physical volumes in a volume set. Volume sets of SCVDRCD data will generally be single volumes, so this value will be set to "1". VOLUME_NAME The formal name of the individual SCVDRCD volume; a more specific identification than VOLUME_SET_NAME. For the SCVDRCD, set to "MAGELLAN SURFACE CHARAC- TERISTICS VECTOR DATA RECORD". VOLUME_ID A unique identifier for the volume. Usually the last two components of the VOLUME_SET_ID (see also Section 2.3.1). For the SCVDRCD, set to "MG_21nn". VOLUME_VERSION_ID The version of the data volume, starting with "1" for original versions and incrementing by 1 for each sub- sequent version. PUBLICATION_DATE The date in YYYY-MM-DD format on which the volume was published or released (see Section 1.4.3). DATA_SET_ID A unique alphanumeric identifier for the data set. For the SCVDRCD, set to "MGN-V-RDRS-5-SCVDR-V1.0" VOLUME_FORMAT The logical format used in writing the SCVDRCD volume. Set to "ISO-9660". MEDIUM_TYPE The physical storage medium for the SCVDRCD volume. Set to "CD-WO". DESCRIPTION A brief text description of the contents of the SCVDRCD volume. MISSION_NAME The planetary mission or project under which the data were acquired. A single mission may be associated with one or more spacecraft. For the SCVDRCD, set to "MAGELLAN" PDS-GEO-SCVDRCD v 1.0 Page 15 SPACECRAFT_NAME The full name of the spacecraft with which these data are associated. For the SCVDRCD, set to "MAGELLAN" SPACECRAFT_ID A mnemonic uniquely associated with SPACECRAFT_NAME. For the SCVDRCD, set to "MGN" INSTITUTION_NAME The name of the institution under which this SCVDRCD volume was produced. Set to "STANFORD UNIVERSITY". FACILITY_NAME The name of the department, laboratory, or subsystem under which this SCVDRCD volume was produced. Set to "CENTER FOR RADAR ASTRONOMY". FULL_NAME The name of the individual or organization responsi- ble for producing this SCVDRCD volume. For the SCVDRCD, set to "DR. G. LEONARD TYLER". ADDRESS_TEXT Mailing address for the individual or organization responsible for producing this SCVDRCD volume. For the SCVDRCD, set to "STARLAB, DURAND BLDG, ROOM 232, STANFORD, CALIFORNIA, 94305-4055, USA". ^DATA_SET_CATALOG File name in the CATALOG directory under which the PDS data set template is stored. Set to "DATASET.CAT". ^INSTRUMENT_CATALOG File name in the CATALOG directory under which the PDS instrument template is stored. Set to "INST.CAT". ^INSTRUMENT_HOST_CATALOG File name in the CATALOG directory under which the PDS instrument host template is stored. Set to "INSTHOST.CAT". ^MISSION_CATALOG File name in the CATALOG directory under which the PDS mission template is stored. Set to "MISSION.CAT". ^PERSONNEL_CATALOG File name in the CATALOG directory under which the PDS personnel template is stored. Set to "PERSONEL.CAT". ^REFERENCE_CATALOG File name in the CATALOG directory under which the PDS reference template is stored. Set to "REFS.CAT". 4.2. Static Directories Static directories are those which do not change (or change very little) from one volume to another. They appear on all volumes. 4.2.1. CATALOG Directory The CATALOG directory contains files used in cataloging the data, including files which provide a detailed description of this volume. 4.2.1.1. CATINFO.TXT File The CATINFO.TXT file contains a description of the contents of the CATALOG directory. The file has an attached PDS label of the form shown in Figure 4-1. This is an ASCII file with 80-byte records. Each line is terminated with a PDS-GEO-SCVDRCD v 1.0 Page 16 carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. 4.2.1.2. DATASET.CAT File The DATASET.CAT file contains PDS catalog information about the data set on this archive volume. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggre- gate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. 4.2.1.3. INST.CAT File The INST.CAT file contains PDS catalog information about the Magellan radar sensor. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. 4.2.1.4. INSTHOST.CAT File The INSTHOST.CAT file contains PDS catalog information about the Magellan spacecraft. This is an ASCII file with 80-byte records. Each line is ter- minated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. 4.2.1.5. MISSION.CAT File The MISSION.CAT file contains PDS catalog information about the Magellan mis- sion. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. 4.2.1.6. PERSONEL.CAT File The PERSONEL.CAT file contains PDS catalog information about personnel who contributed to this data set. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all PDS-GEO-SCVDRCD v 1.0 Page 17 remaining lines are offset 4.2.1.7. REFS.CAT File The REFS.CAT file contains PDS catalog information of references to published papers that describe this data set. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. 4.2.2. DOCUMENT Directory The DOCUMENT directory contains files which describe the data included in the SCVDRCD volume. 4.2.2.1. DOCINFO.TXT File The DOCINFO.TXT file contains a description of the contents of the DOCUMENT directory. The file has an attached PDS label of the form shown in Figure 4- 1. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. 4.2.2.2. SCVDR.ASC File The SCVDR.ASC file is the Software Interface Specification for the SCVDR (the Stanford University product from which this SCVDRCD was made). This is an ASCII file with 80-byte records, suitable for display or printing at 66 lines per page with up to 78 constant-width characters per line. Each line is ter- minated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.2.3. SCVDR.LBL File SCVDR.LBL is a detached label that completely describes SCVDR.ASC and SCVDR.PS. The length of the SCVDR.LBL file is an integral multiple of 80 bytes. All records are padded to 80 bytes with ASCII blanks. Each record ends with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. 4.2.2.4. SCVDR.PS File The SCVDR.PS file is the Software Interface Specification for the SCVDR (the Stanford University product from which this SCVDRCD was made). This is a PostScript file with varying length records, suitable for previewing with a Display PostScript application on a high-resolution graphics terminal or direct printing on a laser printer or photo-typesetter. Each line is ter- minated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. PDS-GEO-SCVDRCD v 1.0 Page 18 4.2.2.5. SCVDRCD.ASC File The SCVDRCD.ASC file is the Software Interface Specification for the SCVDRCD (this document). This is an ASCII file with 80-byte records, suitable for display or printing at 66 lines per page with up to 78 constant-width charac- ters per line. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.2.6. SCVDRCD.LBL File SCVDRCD.LBL is a detached label that completely describes SCVDRCD.ASC and SCVDRCD.PS. The length of the SCVDRCD.LBL file is an integral multiple of 80 bytes. All records are padded to 80 bytes with ASCII blanks. Each record ends with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. 4.2.2.7. SCVDRCD.PS File The SCVDRCD.PS file is the Software Interface Specification for the SCVDRCD (this document). This is a PostScript file with varying length records, suit- able for previewing with a Display PostScript application on a high-resolution graphics terminal or direct printing on a laser printer or photo-typesetter. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.3. INDEX Directory 4.2.3.1. CUMINDEX.LBL File CUMINDEX.LBL is a detached label that completely describes CUMINDEX.TAB. The length of the CUMINDEX.LBL file is an integral multiple of 80 bytes. All records are padded to 80 bytes with ASCII blanks. Each record ends with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. CUMINDEX.LBL differs from INDEX.LBL (see Appendix A) in only three ways: * DESCRIPTION refers to CUMINDEX.TAB rather than to INDEX.TAB * ^TABLE points to CUMINDEX.TAB rather than to INDEX.TAB * INDEX_TYPE = CUMULATIVE rather than SINGLE 4.2.3.2. CUMINDEX.TAB File CUMINDEX.TAB is a table listing all SCVDRCD data files published in all volumes of the volume set to date. It is an ASCII file with fixed-length 78- byte records. Each record contains 76 data bytes followed by a carriage- return (ASCII 13) line-feed (ASCII 10) pair. The detailed format and content are described by CUMINDEX.LBL. PDS-GEO-SCVDRCD v 1.0 Page 19 4.2.3.3. INDEX.LBL File INDEX.LBL is a detached label that completely describes INDEX.TAB. The length of the INDEX.LBL file is an integral multiple of 80 bytes. All records are padded to 80 bytes with ASCII blanks. Each record ends with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. An example label for a SCVDRCD index is shown in Appendix A. Keywords are defined in [3]. 4.2.3.4. INDEX.TAB File INDEX.TAB is a table listing all SCVDRCD data files published in this volume. It is an ASCII file with fixed-length 78-byte records. Each record contains 76 data bytes followed by a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The detailed format and content are described by INDEX.LBL. 4.2.3.5. INDXINFO.TXT File The INDXINFO.TXT file contains a description of the contents of the INDEX directory. The file has an attached PDS label of the form shown in Figure 4- 1. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. 4.2.4. LABEL Directory 4.2.4.1. LABINFO.TXT File The LABINFO.TXT file contains a description of the contents of the LABEL directory. The file has an attached PDS label of the form shown in Figure 4- 1. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. 4.2.4.2. SCVDRANF.FMT File This file describes the contents of the binary data records in the ANF files in the data directories [6]. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. records. Each record is delimited by a carriage-return (ASCII 13) line-feed (ASCII 10) pair. PDS-GEO-SCVDRCD v 1.0 Page 20 4.2.4.3. SCVDRANH.FMT File This file describes the contents of the binary header record in the ANF files in the data directories [6]. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. records. Each record is delimited by a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.4.4. SCVDREDF.FMT File This file describes the contents of the binary data records in the EDF files in the data directories [6]. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. records. Each record is delimited by a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.4.5. SCVDREDH.FMT File This file describes the contents of the binary header record in the EDF files in the data directories [6]. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. records. Each record is delimited by a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.4.6. SCVDRGMF.FMT File This file describes the contents of the binary data records in the GMF files in the GEOMETRY directory [6]. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. records. Each record is delimited by a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.4.7. SCVDRGMH.FMT File This file describes the contents of the binary header record in the GMF files in the GEOMETRY directory [6]. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a PDS-GEO-SCVDRCD v 1.0 Page 21 line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. records. Each record is delimited by a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.4.8. SCVDRIMF.FMT File This file describes the contents of the binary data records in the OIF and SIF files in the data directories [6]. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. records. Each record is delimited by a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.4.9. SCVDRIMH.FMT File This file describes the contents of the binary header record in the OIF and SIF files in the data directories [6]. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. records. Each record is delimited by a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.4.10. SCVDRNFF.FMT File This file describes the contents of the binary data records in the NFF files in the data directories [6]. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. records. Each record is delimited by a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.4.11. SCVDRNFH.FMT File This file describes the contents of the binary header record in the NFF files in the data directories [6]. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. records. Each record is delimited by a carriage-return (ASCII 13) line-feed (ASCII 10) pair. PDS-GEO-SCVDRCD v 1.0 Page 22 4.2.4.12. SCVDROHF.FMT File This file describes the contents of the single binary data record in the OHF files in the data directories [6]. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. records. Each record is delimited by a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.5. SOFTWARE Directory This directory contains a small number of C, C++, and Perl commands that read SCVDR data files. These commands do nothing powerful-they are intended to be employed as skeletons around which useful software can be constructed. All lines in these files have been padded on the right with blanks and ter- minated with an ASCII carriage return and linefeed in columns 79 and 80. It may be necessary to copy the files to magnetic disk, removing one or more of these characters in order to compile these sources on particular operating systems. Similarly, many of the C language source and header files embed other header files using lowercase file names. On systems such as MacOS or UNIX that are case-sensitive toward file names, it may be necessary to copy the include files onto magnetic disk and rename them to lower case letters if the CD-ROM file names are represented in uppercase. Most files in this directory do NOT contain PDS labels. 4.2.5.1. MAKEFILE.MAK File This file contains a script used by the software maintenance command "make" to generate executables from the C-language source files in this directory. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The syntax is simply "make", but it may be necessary to copy the files to magnetic disk, removing one or more of these characters in order to compile these sources on particu- lar operating systems. 4.2.5.2. SCV_RDR.C File This file contains a set of low level C-language routines to read SCVDR data files into the structures defined in SCVDR.H. SCV_RDR.C calls the routines in SCVPARSE.C to handle PDS and CCSDS labels. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.5.3. SCV_RDR.I File This file contains C-language function definition skeletons for SCV_RDR.C rou- tines. It may be used with C++ and with ANSI and K&R C compilers. This is an ASCII file with 80-byte records. Each line is terminated with a carriage- return (ASCII 13) line-feed (ASCII 10) pair. 4.2.5.4. SCVDR.H File This C language header file defines all SCVDR binary data structures. This is an ASCII file with 80-byte records. Each line is terminated with a carriage- PDS-GEO-SCVDRCD v 1.0 Page 23 return (ASCII 13) line-feed (ASCII 10) pair. 4.2.5.5. SCVDRSCN.PL File This Perl script lists the contents of SCVDR data files. The file also func- tions as its own UNIX manual and can be printed by "nroff -man" or "troff -man". This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.5.6. SCVPARSE.C File This file contains low-level C-language routines to parse PDS and CCSDS SFDU labels. It is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.5.7. SCVPARSE.H File This C language header file contains definitions of PDS and CCSDS SFDU SFDU labels. It is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.5.8. SCVPARSE.I File This file contains C-language function definition skeletons for SCVPARSE.C routines. It may be used with C++ and with ANSI and K&R C compilers. This is an ASCII file with 80-byte records. Each line is terminated with a carriage- return (ASCII 13) line-feed (ASCII 10) pair. 4.2.5.9. SOFTINFO.TXT File The SOFTINFO.TXT file contains a description of the contents of the SOFTWARE directory. The file has an attached PDS label of the form shown in Figure 4- 1. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. 4.2.5.10. TESTANF.C File This is a C language main program that reads an ANF (altimetry inversion) file (specified as its only argument). If successful, it returns without any out- put. Otherwise, it writes an error message to stderr and then exits. It may be used as a skeleton for the development of more realistic applications. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.5.11. TESTEDF.C File This is a C language main program that reads an EDF (emissivity) file (speci- fied as its only argument). If successful, it returns without any output. Otherwise, it writes an error message to stderr and then exits. It may be used as a skeleton for the development of more realistic applications. This is an ASCII file with 80-byte records. Each line is terminated with a carriage- return (ASCII 13) line-feed (ASCII 10) pair. PDS-GEO-SCVDRCD v 1.0 Page 24 4.2.5.12. TESTGMF.C File This is a C language main program that reads a GMF (G-Matrix) file (specified as its only argument). If successful, it returns without any output. Other- wise, it writes an error message to stderr and then exits. It may be used as a skeleton for the development of more realistic applications. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.5.13. TESTIF.C File This is a C language main program that reads a SIF (sinusoidal image data) or OIF (oblique sinusoidal image data) file (specified as its only argument). If successful, it returns without any output. Otherwise, it writes an error mes- sage to stderr and then exits. It may be used as a skeleton for the develop- ment of more realistic applications. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.5.14. TESTNFF.C File This is a C language main program that reads an NFF (inversion fit) file (specified as its only argument). If successful, it returns without any out- put. Otherwise, it writes an error message to stderr and then exits. It may be used as a skeleton for the development of more realistic applications. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.5.15. TESTOHF.C File This is a C language main program that reads an OHF (orbit header) file (specified as its only argument). If successful, it returns without any out- put. Otherwise, it writes an error message to stderr and then exits. It may be used as a skeleton for the development of more realistic applications. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.2.5.16. TYPES.H File This is a C-language header file containing miscellaneous SCVDR definitions. This is an ASCII file with 80-byte records. Each line is terminated with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. 4.3. Data Directories SCVDRCD volumes include directories for each orbit during which useful surface characteristics data were taken. The data inherited from the SCVDR products are recorded in 6 separate binary files: ANFnnnnn.v Altimetry Inversion File EDFnnnnn.v Emissivity Data File NFFnnnnn.v Altimetry Inversion Fit File OHFnnnnn.v Orbit Header File OIFnnnnn.v Oblique Sinusoidal Image File SIFnnnnn.v Sinusoidal Image File PDS-GEO-SCVDRCD v 1.0 Page 25 Each data file is paired with a PDS detached label file with the same name; e.g. ANF00376.1 is paired with ANF00376.LBL. The label files describe the contents of the data files in the Planetary Data System's Object Descriptor Language (ODL) as described in [2]. Examples of label files and companion format files are included in Appendices A and B, respectively. 4.3.1. ANFnnnnn.v The Altimetry Inversion File (ANF) tabulates the radar scattering cross- section for varying incidence angles at a series of footprints lying along the Magellan nadir track. It is generated from the ALT-EDR product. Its format is defined in [6]. 4.3.2. ANFnnnnn.LBL ANFnnnnn.LBL is a detached label that describes the accompanying ANFnnnnn.v file. Its length is an integral multiple of 80 bytes. All records are padded to 80 bytes with ASCII blanks, and each record ends with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. An example ANFnnnnn.LBL file is shown in Appendix A. 4.3.3. EDFnnnnn.v The Emissivity Data File (EDF) tabulates the microwave emissivity of the sur- face footprint defined by the intersection of the Magellan High Gain Antenna with the Venus surface. It is generated from radiometer measurements contained in the Magellan SAR burst header files on ALT-EDR and C-BIDR products. Its format is defined in [6]. 4.3.4. EDFnnnnn.LBL EDFnnnnn.LBL is a detached label that describes the accompanying EDFnnnnn.v file. Its length is an integral multiple of 80 bytes. All records are padded to 80 bytes with ASCII blanks, and each record ends with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) Snnnn_vv | +---------------+ | | |- ANFnnnnn.v |- ANFnnnnn.LBL |- EDFnnnnn.v |- EDFnnnnn.LBL |- NFFnnnnn.v |- NFFnnnnn.LBL |- OHFnnnnn.v |- OHFnnnnn.LBL |- OIFnnnnn.v |- OIFnnnnn.LBL +- SIFnnnnn.v +- SIFnnnnn.LBL Figure 4-3. Example SCVDRCD Data Directory Structure PDS-GEO-SCVDRCD v 1.0 Page 26 followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. An example EDFnnnnn.LBL file is shown in Appendix A. 4.3.5. NFFnnnnn.v The Altimetry Inversion Fit File (NFF) contains the results of fitting one or more scattering models to the scattering function of each footprint of the accompanying ANF file. Its format is defined in [6]. 4.3.6. NFFnnnnn.LBL NFFnnnnn.LBL is a detached label that describes the accompanying NFFnnnnn.v file. Its length is an integral multiple of 80 bytes. All records are padded to 80 bytes with ASCII blanks, and each record ends with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. An example NFFnnnnn.LBL file is shown in Appendix A. 4.3.7. OHFnnnnn.v The Orbit Header File (OHF) contains information about the other five data files in the same directory. Its format is defined in [6]. 4.3.8. OHFnnnnn.LBL OHFnnnnn.LBL is a detached label that describes the accompanying OHFnnnnn.v file. Its length is an integral multiple of 80 bytes. All records are padded to 80 bytes with ASCII blanks, and each record ends with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. An example OHFnnnnn.LBL file is shown in Appendix A. 4.3.9. OIFnnnnn.v The Oblique Sinusoidal Image File (OIF) contains the results of fitting an N- th order polynomial in incidence angle to the measurements of SAR backscatter cross-section at each line of a polar image file. It is generated from Magel- lan C-BIDR and F-BIDR products. Its format is defined in [6]. 4.3.10. OIFnnnnn.LBL OIFnnnnn.LBL is a detached label that describes the accompanying OIFnnnnn.v file. Its length is an integral multiple of 80 bytes. All records are padded to 80 bytes with ASCII blanks, and each record ends with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. An example OIFnnnnn.LBL file is shown in PDS-GEO-SCVDRCD v 1.0 Page 27 Appendix A. 4.3.11. SIFnnnnn.v The Sinusoidal Image File (SIF) contains the results of fitting an N-th order polynomial in incidence angle to the measurements of SAR backscatter cross- section at each line of a non-polar image file. It is generated from Magellan C-BIDR and F-BIDR products. Its format is defined in [6]. 4.3.12. SIFnnnnn.LBL SIFnnnnn.LBL is a detached label that describes the accompanying SIFnnnnn.v file. Its length is an integral multiple of 80 bytes. All records are padded to 80 bytes with ASCII blanks, and each record ends with a carriage-return (ASCII 13) line-feed (ASCII 10) pair. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. An example SIFnnnnn.LBL file is shown in Appendix A. PDS-GEO-SCVDRCD v 1.0 Page 28 CHAPTER 5 SUPPORT STAFF AND COGNIZANT PERSONNEL For questions concerning this volume set: Richard A. Simpson Center for Radar Astronomy Stanford University Stanford, CA 94305-4055 Telephone: 415-423-3525 Datafax: 415-723-9251 Internet: rsimpson@magellan.stanford.edu URL: http://nova.stanford.edu/ Peter G. Ford Center for Space Research Building 37, Room 601 Massachusetts Institute of Technology 70 Vassar Street Cambridge, MA 02139 Telephone: 617-253-6485 Datafax: 617-253-0861 Internet: pds-requests@space.mit.edu URL: http://delcano.mit.edu/ Planetary Data System: PDS Operator MS 525/3610 Jet Propulsion Laboratory 4800 Oak Grove Drive Pasadena, CA 91109 Phone: 818-306-6130 NSI/Decnet: JPLPDS::PDS_OPERATOR Internet: pds_operator@jplpds.jpl.nasa.gov URL: http://stardust.jpl.nasa.gov/pds_home.html PDS-GEO-SCVDRCD v 1.0 Page 29 PDS-GEO-SCVDRCD v 1.0 Page 30 APPENDIX A EXAMPLE PDS LABELS A.1. ANF00376.LBL Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 DATA_SET_ID = 'MGN-V-RDRS-5-SCVDR-V1.0' PRODUCT_ID = 'ANF00376.1' SOURCE_PRODUCT_ID = 'SCVDR.00376-00399;1' /* PHYSICAL DESCRIPTION OF THE FILE RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 32500 FILE_RECORDS = 25 /* LOCATION OF OBJECTS WITHIN THE FILE ^HEADER = ('ANF00376.1',21) ^HEADER_TABLE = ('ANF00376.1',395) ^TABLE = ('ANF00376.1',559) /* GENERAL PARAMETERS SPACECRAFT_NAME = 'MAGELLAN' MISSION_PHASE_NAME = 'MAPPING CYCLE 1' INSTRUMENT_NAME = 'RADAR SYSTEM' TARGET_NAME = 'VENUS' ORBIT_NUMBER = 376 START_TIME = 1990-09-15T16:22:21.074 STOP_TIME = 1990-09-15T16:59:27.022 PRODUCT_CREATION_TIME = 1992-08-27T22:21:46 NOTE = 'ALTIMETRY_INVERSION_FILE' DESCRIPTION = "The Altimetry Inversion Data File (ANF) contains the results of inverting the time and frequency spectra of a single orbit of Magellan altimetry, from the ALT-EDR product, by means of the accompanying Geometry Matrix File (GMF). The ANF contains a CCSD header, a keyword and value SFDU, a binary header record SFDU, and one or more binary data record SFDUs, sandwiched between starting and ending marker SFDUs." /* DESCRIPTION OF OBJECTS WITHIN THE FILE OBJECT = HEADER HEADER_TYPE = 'N/A' SFDU_FORMAT_ID = 'NJPL1K00KL00' INTERCHANGE_FORMAT = ASCII RECORD_TYPE = STREAM BYTES = 374 RECORDS = 14 DESCRIPTION = "SFDU keyword label (K-type)." END_OBJECT = HEADER OBJECT = HEADER_TABLE HEADER_TYPE = 'N/A' SFDU_FORMAT_ID = 'NJPL1I000005' INTERCHANGE_FORMAT = BINARY PDS-GEO-SCVDRCD v 1.0 Page 31 RECORD_TYPE = FIXED_LENGTH ROW_BYTES = 72 ROWS = 1 COLUMNS = 24 ^STRUCTURE = 'SCVDRANH.FMT' DESCRIPTION = "The single binary ANF header record contains constants that describe the inversion process, algorithm IDs, and the maximum sizes of arrays in the ANF data records." END_OBJECT = HEADER_TABLE OBJECT = TABLE SFDU_FORMAT_ID = 'NJPL1I000006' INTERCHANGE_FORMAT = BINARY RECORD_TYPE = UNDEFINED ROW_BYTES = 'UNK' ROWS = 712 COLUMNS = 64 ^STRUCTURE = 'SCVDRANF.FMT' DESCRIPTION = "Each varying length ANF data record contains measurements of the surface scattering cross-section at various incidence angle, obtained by inverting the altimeter's delay and frequency spectra using the geometry matrices in the file 'GMF00376.1' located in the GEOMETRY directory of this disk." END_OBJECT = TABLE END A.2. CUMINDEX.LBL Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 78 FILE_RECORDS = 13 DATA_SET_ID = 'MGN-V-RDRS-5-SCVDR-V1.0' ^TABLE = "CUMINDEX.TAB" SPACECRAFT_NAME = MAGELLAN INSTRUMENT_NAME = 'RADAR SYSTEM' TARGET_NAME = VENUS DESCRIPTION = "This table locates all SCVDR products on all archive volumes produced to date." /* DESCRIPTION OF THE COLUMNS CONTAINED IN THE TABLE */ OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROW_BYTES = 76 ROWS = 13 COLUMNS = 7 OBJECT = COLUMN NAME = ORBIT_NUMBER DESCRIPTION = "Orbit number of the data file" DATA_TYPE = 'ASCII INTEGER' START_BYTE = 1 BYTES = 4 END_OBJECT ANF00376.LBL... Page 32 OBJECT = COLUMN NAME = VERSION_NUMBER DESCRIPTION = "Version number of the data file" DATA_TYPE = 'ASCII INTEGER' START_BYTE = 6 BYTES = 2 END_OBJECT OBJECT = COLUMN NAME = FILE_NAME DESCRIPTION = "File name of the data file on its CD-ROM" DATA_TYPE = CHARACTER START_BYTE = 10 BYTES = 7 END_OBJECT OBJECT = COLUMN NAME = DIRECTORY_NAME DESCRIPTION = "Directory in which the data file resides on its CD-ROM" DATA_TYPE = CHARACTER START_BYTE = 23 BYTES = 8 END_OBJECT OBJECT = COLUMN NAME = ORIGINAL_PRODUCT DESCRIPTION = "Unique Product ID of the original SCVDR data tape assigned by the Magellan Project from which this SCVDR was generated." DATA_TYPE = CHARACTER START_BYTE = 34 BYTES = 19 END_OBJECT OBJECT = COLUMN NAME = GEOMETRY_FILE_NAME DESCRIPTION = "This field is only non-blank for ANF files, for which it denotes the file name of the geometry matrix file (GMF) used to create this product. All geometry files are located in the GEOMETRY directory of the same disk as the corresponding ANF file." DATA_TYPE = CHARACTER START_BYTE = 56 BYTES = 10 END_OBJECT OBJECT = COLUMN NAME = VOLUME_ID DESCRIPTION = "CD-ROM volume in which the data file resides" DATA_TYPE = CHARACTER START_BYTE = 69 BYTES = 7 END_OBJECT END_OBJECT END CUMINDEX.LBL... Page 33 A.3. EDF00376.LBL Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 DATA_SET_ID = 'MGN-V-RDRS-5-SCVDR-V1.0' PRODUCT_ID = 'EDF00376.1' SOURCE_PRODUCT_ID = 'SCVDR.00376-00399;1' /* PHYSICAL DESCRIPTION OF THE FILE RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 32500 FILE_RECORDS = 20 /* LOCATION OF OBJECTS WITHIN THE FILE ^HEADER = ('EDF00376.1',21) ^HEADER_TABLE = ('EDF00376.1',395) ^TABLE = ('EDF00376.1',575) /* GENERAL PARAMETERS SPACECRAFT_NAME = 'MAGELLAN' MISSION_PHASE_NAME = 'MAPPING CYCLE 1' INSTRUMENT_NAME = 'RADAR SYSTEM' TARGET_NAME = 'VENUS' ORBIT_NUMBER = 376 START_TIME = 1990-09-15T16:22:15.591 STOP_TIME = 1990-09-15T16:59:26.060 PRODUCT_CREATION_TIME = 1992-08-27T22:21:46 NOTE = 'EMISSIVITY_FILE' DESCRIPTION = "The Emissivity Data File (EDF) contains measurements of the microwave emissivity of the Venus surface, obtained from the radiometer mode of the Magellan radar sensor. The EDF contains a CCSD header, a keyword and value SFDU, a binary header record SFDU, and one or more binary data record SFDUs, sandwiched between starting and ending marker SFDUs." /* DESCRIPTION OF OBJECTS WITHIN THE FILE OBJECT = HEADER HEADER_TYPE = 'N/A' SFDU_FORMAT_ID = 'NJPL1K00KL00' INTERCHANGE_FORMAT = ASCII RECORD_TYPE = STREAM BYTES = 374 RECORDS = 14 DESCRIPTION = "SFDU keyword label (K-type)." END_OBJECT = HEADER OBJECT = HEADER_TABLE HEADER_TYPE = 'N/A' SFDU_FORMAT_ID = 'NJPL1I000021' INTERCHANGE_FORMAT = BINARY RECORD_TYPE = FIXED_LENGTH ROW_BYTES = 92 ROWS = 1 COLUMNS = 30 ^STRUCTURE = 'SCVDREDH.FMT' DESCRIPTION = "The single binary EDF header record contains constants that describe the radiometry data reduction process, the algorithm IDs, and planetary parameters." END_OBJECT = HEADER_TABLE EDF00376.LBL... Page 34 OBJECT = TABLE SFDU_FORMAT_ID = 'NJPL1I000022' INTERCHANGE_FORMAT = BINARY RECORD_TYPE = FIXED_LENGTH ROW_BYTES = 240 ROWS = 2628 COLUMNS = 42 ^STRUCTURE = 'SCVDREDF.FMT' DESCRIPTION = "Each fixed length EDF data record contains the result of processing a pair of measurements made by the radiometric mode of the Magellan radar system, one in which the receiver was coupled to the high gain antenna, the other to a load at a known temperature. The difference between these values is used to derive the surface microwave brightness, and hence its emissivity." END_OBJECT = TABLE END A.4. GMF00376.LBL Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 DATA_SET_ID = 'MGN-V-RDRS-5-SCVDR-V1.0' PRODUCT_ID = 'GMF00376.1' SOURCE_PRODUCT_ID = 'SCVDR.00376-00399;1' /* PHYSICAL DESCRIPTION OF THE FILE RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 32500 FILE_RECORDS = 149 /* LOCATION OF OBJECTS WITHIN THE FILE ^HEADER = ('GMF00376.1',21) ^HEADER_TABLE = ('GMF00376.1',329) ^TABLE = ('GMF00376.1',459) /* GENERAL PARAMETERS SPACECRAFT_NAME = 'MAGELLAN' MISSION_PHASE_NAME = 'MAPPING CYCLE 1' INSTRUMENT_NAME = 'RADAR SYSTEM' TARGET_NAME = 'VENUS' ORBIT_NUMBER = 376 PRODUCT_CREATION_TIME = 1992-08-27T22:21:46 NOTE = 'GEOMETRY_MATRIX_FILE' DESCRIPTION = "The Geometry Matrix Data File (GMF) contains the values of the G-matrices used to invert the delay and frequency spectra of the Magellan altimeter. The GMF contains a CCSD header, a keyword and value SFDU, a binary header record SFDU, and one or more binary data record SFDUs, sandwiched between starting and ending marker SFDUs." /* DESCRIPTION OF OBJECTS WITHIN THE FILE OBJECT = HEADER HEADER_TYPE = 'N/A' SFDU_FORMAT_ID = 'NJPL1K00KL00' INTERCHANGE_FORMAT = ASCII RECORD_TYPE = STREAM BYTES = 308 EDF00376.LBL... Page 35 RECORDS = 11 DESCRIPTION = "SFDU keyword label (K-type)." END_OBJECT = HEADER OBJECT = HEADER_TABLE HEADER_TYPE = 'N/A' SFDU_FORMAT_ID = 'NJPL1I000023' INTERCHANGE_FORMAT = BINARY RECORD_TYPE = FIXED_LENGTH ROW_BYTES = 44 ROWS = 1 COLUMNS = 8 ^STRUCTURE = 'SCVDRGMH.FMT' DESCRIPTION = "The single binary GMF header record contains the maximum sizes of arrays in the GMF data records." END_OBJECT = HEADER_TABLE OBJECT = TABLE SFDU_FORMAT_ID = 'NJPL1I000024' INTERCHANGE_FORMAT = BINARY RECORD_TYPE = UNDEFINED ROW_BYTES = 'UNK' ROWS = 168 COLUMNS = 23 ^STRUCTURE = 'SCVDRGMF.FMT' DESCRIPTION = "Each varying length GMF record contains the matrices used to invert the altimeter delay or frequency spectrum to yield the scattering functions in the ANF data records." END_OBJECT = TABLE END A.5. INDEX.LBL Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 78 FILE_RECORDS = 13 DATA_SET_ID = 'MGN-V-RDRS-5-SCVDR-V1.0' ^TABLE = "INDEX.TAB" SPACECRAFT_NAME = MAGELLAN INSTRUMENT_NAME = 'RADAR SYSTEM' TARGET_NAME = VENUS DESCRIPTION = "This table locates all SCVDR products on the current volume" /* DESCRIPTION OF THE COLUMNS CONTAINED IN THE TABLE */ OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROW_BYTES = 76 ROWS = 13 COLUMNS = 7 OBJECT = COLUMN NAME = ORBIT_NUMBER DESCRIPTION = "Orbit number of the data file" GMF00376.LBL... Page 36 DATA_TYPE = 'ASCII INTEGER' START_BYTE = 1 BYTES = 4 END_OBJECT OBJECT = COLUMN NAME = VERSION_NUMBER DESCRIPTION = "Version number of the data file" DATA_TYPE = 'ASCII INTEGER' START_BYTE = 6 BYTES = 2 END_OBJECT OBJECT = COLUMN NAME = FILE_NAME DESCRIPTION = "File name of the data file on this CD-ROM" DATA_TYPE = CHARACTER START_BYTE = 10 BYTES = 7 END_OBJECT OBJECT = COLUMN NAME = DIRECTORY_NAME DESCRIPTION = "Directory in which the data file resides on this CD-ROM" DATA_TYPE = CHARACTER START_BYTE = 23 BYTES = 8 END_OBJECT OBJECT = COLUMN NAME = ORIGINAL_PRODUCT DESCRIPTION = "Unique Product ID of the original SCVDR data tape assigned by the Magellan Project from which this SCVDR was generated." DATA_TYPE = CHARACTER START_BYTE = 34 BYTES = 19 END_OBJECT OBJECT = COLUMN NAME = GEOMETRY_FILE_NAME DESCRIPTION = "This field is only non-blank for ANF files, for which it denotes the file name of the geometry matrix file (GMF) used to create this product. All geometry files are located in the GEOMETRY directory of the same disk as the corresponding ANF file." DATA_TYPE = CHARACTER START_BYTE = 56 BYTES = 10 END_OBJECT OBJECT = COLUMN NAME = VOLUME_ID DESCRIPTION = "CD-ROM volume in which the data file resides" DATA_TYPE = CHARACTER START_BYTE = 69 BYTES = 7 END_OBJECT INDEX.LBL... Page 37 END_OBJECT END A.6. NFF00376.LBL Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 DATA_SET_ID = 'MGN-V-RDRS-5-SCVDR-V1.0' PRODUCT_ID = 'NFF00376.1' SOURCE_PRODUCT_ID = 'SCVDR.00376-00399;1' /* PHYSICAL DESCRIPTION OF THE FILE RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 32500 FILE_RECORDS = 5 /* LOCATION OF OBJECTS WITHIN THE FILE ^HEADER = ('NFF00376.1',21) ^HEADER_TABLE = ('NFF00376.1',393) ^TABLE = ('NFF00376.1',551) /* GENERAL PARAMETERS SPACECRAFT_NAME = 'MAGELLAN' MISSION_PHASE_NAME = 'MAPPING CYCLE 1' INSTRUMENT_NAME = 'RADAR SYSTEM' TARGET_NAME = 'VENUS' ORBIT_NUMBER = 376 START_TIME = 1990-09-15T16:22:21.074 STOP_TIME = 1990-09-15T16:59:27.022 PRODUCT_CREATION_TIME = 1992-08-27T22:21:46 NOTE = 'INVERSION_FIT_FILE' DESCRIPTION = "The Altimetry Inversion Fit File (NFF) contains the results of fitting the radar scattering cross sections contained in the accompanying Altimetry Inversion Data File to one or more theoretical models. The NFF contains a CCSD header, a keyword and value SFDU, a binary header record SFDU, and one or more binary data record SFDUs, sandwiched between starting and ending marker SFDUs." /* DESCRIPTION OF OBJECTS WITHIN THE FILE OBJECT = HEADER HEADER_TYPE = 'N/A' SFDU_FORMAT_ID = 'NJPL1K00KL00' INTERCHANGE_FORMAT = ASCII RECORD_TYPE = STREAM BYTES = 372 RECORDS = 14 DESCRIPTION = "SFDU keyword label (K-type)." END_OBJECT = HEADER OBJECT = HEADER_TABLE HEADER_TYPE = 'N/A' SFDU_FORMAT_ID = 'NJPL1I000007' INTERCHANGE_FORMAT = BINARY RECORD_TYPE = FIXED_LENGTH ROW_BYTES = 72 ROWS = 1 COLUMNS = 20 INDEX.LBL... Page 38 ^STRUCTURE = 'SCVDRNFH.FMT' DESCRIPTION = "The single binary NFF header record contains constants that describe the fitting process, algorithm IDs, and the maximum sizes of arrays in the NFF data records." END_OBJECT = HEADER_TABLE OBJECT = TABLE SFDU_FORMAT_ID = 'NJPL1I000008' INTERCHANGE_FORMAT = BINARY RECORD_TYPE = UNDEFINED ROW_BYTES = 'UNK' ROWS = 712 COLUMNS = 13 ^STRUCTURE = 'SCVDRNFF.FMT' DESCRIPTION = "Each varying length NFF data record contains the result of fitting a scattering function from the corresponding ANF data record to one or more scattering models." END_OBJECT = TABLE END A.7. OHF00376.LBL Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 DATA_SET_ID = 'MGN-V-RDRS-5-SCVDR-V1.0' PRODUCT_ID = 'OHF00376.1' SOURCE_PRODUCT_ID = 'SCVDR.00376-00399;1' /* PHYSICAL DESCRIPTION OF THE FILE RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 32500 FILE_RECORDS = 1 /* LOCATION OF OBJECTS WITHIN THE FILE ^HEADER = ('OHF00376.1',21) ^TABLE = ('OHF00376.1',371) /* GENERAL PARAMETERS SPACECRAFT_NAME = 'MAGELLAN' MISSION_PHASE_NAME = 'MAPPING CYCLE 1' INSTRUMENT_NAME = 'RADAR SYSTEM' TARGET_NAME = 'VENUS' ORBIT_NUMBER = 376 START_TIME = 1990-09-15T16:22:15.591 STOP_TIME = 1990-09-15T16:59:27.022 PRODUCT_CREATION_TIME = 1992-08-27T22:21:46 NOTE = 'ORBIT_HEADER_FILE' DESCRIPTION = "The Orbit Header File (OHF) identifies the orbit number, time frame, and orbital geometry for one Magellan orbit. The OHF contains only a CCSD header, a keyword and value SFDU, and a binary header record SFDU." /* DESCRIPTION OF OBJECTS WITHIN THE FILE OBJECT = HEADER HEADER_TYPE = 'N/A' SFDU_FORMAT_ID = 'NJPL1K00KL00' INTERCHANGE_FORMAT = ASCII NFF00376.LBL... Page 39 RECORD_TYPE = STREAM BYTES = 350 RECORDS = 13 DESCRIPTION = "SFDU keyword label (K-type)." END_OBJECT = HEADER OBJECT = TABLE SFDU_FORMAT_ID = 'NJPL1I000004' INTERCHANGE_FORMAT = BINARY RECORD_TYPE = FIXED_LENGTH ROW_BYTES = 280 ROWS = 1 COLUMNS = 25 ^STRUCTURE = 'SCVDROHF.FMT' DESCRIPTION = "The single binary OHF data record contains the number of data records in the other data files, the starting and ending times of the data taking periods, and the predicted Keplerian elements of the orbit." END_OBJECT = TABLE END A.8. OIF00376.LBL Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 DATA_SET_ID = 'MGN-V-RDRS-5-SCVDR-V1.0' PRODUCT_ID = 'OIF00376.1' SOURCE_PRODUCT_ID = 'SCVDR.00376-00399;1' /* PHYSICAL DESCRIPTION OF THE FILE RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 32500 FILE_RECORDS = 19 /* LOCATION OF OBJECTS WITHIN THE FILE ^HEADER = ('OIF00376.1',21) ^HEADER_TABLE = ('OIF00376.1',395) ^TABLE = ('OIF00376.1',543) /* GENERAL PARAMETERS SPACECRAFT_NAME = 'MAGELLAN' MISSION_PHASE_NAME = 'MAPPING CYCLE 1' INSTRUMENT_NAME = 'RADAR SYSTEM' TARGET_NAME = 'VENUS' ORBIT_NUMBER = 376 START_TIME = 1990-09-15T16:22:21.985 STOP_TIME = 1990-09-15T16:26:21.602 PRODUCT_CREATION_TIME = 1992-08-27T22:21:46 NOTE = 'OBLIQUE_SINUSOIDAL_IMAGE_FILE' DESCRIPTION = "The Oblique Sinusoidal Image Data File (OIF) contains the results of fitting the radar backscatter cross-section measurements of a single Magellan orbit, from the oblique sinusoidal (polar) image file of the C-BIDR or F-BIDR product, to a quadratic function, along with a histogram of pixel values used in the fit. The OIF contains a CCSD header, a keyword and value SFDU, a binary header record SFDU, and one or more binary data record SFDUs, sandwiched between starting and ending marker SFDUs." OHF00376.LBL... Page 40 CONFIDENCE_LEVEL_NOTE = "Results close to the South Pole (within 2 degrees) may be unreliable." /* DESCRIPTION OF OBJECTS WITHIN THE FILE OBJECT = HEADER HEADER_TYPE = 'N/A' SFDU_FORMAT_ID = 'NJPL1K00KL00' INTERCHANGE_FORMAT = ASCII RECORD_TYPE = STREAM BYTES = 374 RECORDS = 14 DESCRIPTION = "SFDU keyword label (K-type)." END_OBJECT = HEADER OBJECT = HEADER_TABLE HEADER_TYPE = 'N/A' SFDU_FORMAT_ID = 'NJPL1I000010' INTERCHANGE_FORMAT = BINARY RECORD_TYPE = FIXED_LENGTH ROW_BYTES = 60 ROWS = 1 COLUMNS = 12 ^STRUCTURE = 'SCVDRIMH.FMT' DESCRIPTION = "The single binary OIF header record contains constants that describe the fitting process, algorithm IDs, and the maximum sizes of arrays in the OIF data records." END_OBJECT = HEADER_TABLE OBJECT = TABLE SFDU_FORMAT_ID = 'NJPL1I000012' INTERCHANGE_FORMAT = BINARY RECORD_TYPE = UNDEFINED ROW_BYTES = 'UNK' ROWS = 609 COLUMNS = 45 ^STRUCTURE = 'SCVDRIMF.FMT' DESCRIPTION = "Each varying length OIF data record contains the result of fitting the radar backscatter function derived from approximately 9 rasters of the C-BIDR image, or approximately 27 rasters of the F-BIDR image, to an n'th order polynomial." END_OBJECT = TABLE END A.9. SIF00376.LBL Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 DATA_SET_ID = 'MGN-V-RDRS-5-SCVDR-V1.0' PRODUCT_ID = 'SIF00376.1' SOURCE_PRODUCT_ID = 'SCVDR.00376-00399;1' /* PHYSICAL DESCRIPTION OF THE FILE RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 32500 FILE_RECORDS = 245 /* LOCATION OF OBJECTS WITHIN THE FILE OIF00376.LBL... Page 41 ^HEADER = ('SIF00376.1',21) ^HEADER_TABLE = ('SIF00376.1',395) ^TABLE = ('SIF00376.1',543) /* GENERAL PARAMETERS SPACECRAFT_NAME = 'MAGELLAN' MISSION_PHASE_NAME = 'MAPPING CYCLE 1' INSTRUMENT_NAME = 'RADAR SYSTEM' TARGET_NAME = 'VENUS' ORBIT_NUMBER = 376 START_TIME = 1990-09-15T16:23:18.479 STOP_TIME = 1990-09-15T16:59:25.823 PRODUCT_CREATION_TIME = 1992-08-27T22:21:46 NOTE = 'SINUSOIDAL_IMAGE_FILE' DESCRIPTION = "The Sinusoidal Image Data File (SIF) contains the results of fitting the radar backscatter cross-section measurements of a single Magellan orbit, from the sinusoidal image file of the C-BIDR or F-BIDR product, to a quadratic function, along with a histogram of pixel values used in the fit. The OIF contains a CCSD header, a keyword and value SFDU, a binary header record SFDU, and one or more binary data record SFDUs, sandwiched between starting and ending marker SFDUs." /* DESCRIPTION OF OBJECTS WITHIN THE FILE OBJECT = HEADER HEADER_TYPE = 'N/A' SFDU_FORMAT_ID = 'NJPL1K00KL00' INTERCHANGE_FORMAT = ASCII RECORD_TYPE = STREAM BYTES = 374 RECORDS = 14 DESCRIPTION = "SFDU keyword label (K-type)." END_OBJECT = HEADER OBJECT = HEADER_TABLE HEADER_TYPE = 'N/A' SFDU_FORMAT_ID = 'NJPL1I000010' INTERCHANGE_FORMAT = BINARY RECORD_TYPE = FIXED_LENGTH ROW_BYTES = 60 ROWS = 1 COLUMNS = 12 ^STRUCTURE = 'SCVDRIMH.FMT' DESCRIPTION = "The single binary SIF header record contains constants that describe the fitting process, algorithm IDs, and the maximum sizes of arrays in the SIF data records." END_OBJECT = HEADER_TABLE OBJECT = TABLE SFDU_FORMAT_ID = 'NJPL1I000012' INTERCHANGE_FORMAT = BINARY RECORD_TYPE = UNDEFINED ROW_BYTES = 'UNK' ROWS = 7343 COLUMNS = 45 ^STRUCTURE = 'SCVDRIMF.FMT' DESCRIPTION = "Each varying length SIF data record contains the result of fitting the radar backscatter function derived from approximately 9 rasters of the C-BIDR image, or approximately 27 rasters of the F-BIDR image, to an n'th order polynomial." SIF00376.LBL... Page 42 END_OBJECT = TABLE END SIF00376.LBL... Page 43 APPENDIX B FORMAT FILES B.1. SCVDRANF.FMT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 OBJECT = COLUMN NAME = SFDU_AGGREGATE_HEADER START_BYTE = 1 DATA_TYPE = CHARACTER BYTES = 20 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NR_SFDU USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "'NJPL1I0000060000nnnn', the number '0006' is registered with the NJPL SFDU authority as the 'Altimetry Inversion Data Record'. 'nnnn' is the length in bytes of the remainder of the SFDU, which can vary from record to record." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FOOTPRINT_NUMBER START_BYTE = 21 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NR_NFOOT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Starting from 1, the number of the Altimetry Inversion Record in increasing order of Altimetry Footprint Time (FOOTPRINT_TIME)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BURST_NUMBER START_BYTE = 25 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NR_BURST USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The logical record number from the ALT-EDR burst SFDU most closely associated with this footprint. If the number of bursts averaged (NUMBER_OF_BURSTS_AVERAGE) is odd, the middle burst; if NUMBER_OF_BURSTS_AVERAGED is even, the earlier of the two middle bursts." SIF00376.LBL... Page 44 END_OBJECT = COLUMN OBJECT = COLUMN NAME = FLAG_FIELDS START_BYTE = 29 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NR_FLAGS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Stanford Altimetry Inversion Record Flag Values (see Table 5-5a of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FOOTPRINT_TIME START_BYTE = 33 DATA_TYPE = IEEE_REAL BYTES = 8 UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = NR_SCET USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The burst start time (seconds of TDB since J2000; see Section 1.5.4.2 of the SCVDR SIS) for the burst given by BURST_NUMBER." END_OBJECT = COLUMN OBJECT = COLUMN NAME = GROSS_DOPPLER_SHIFT START_BYTE = 41 DATA_TYPE = IEEE_REAL BYTES = 8 UNIT = 'HZ' OBJECT = ALIAS ALIAS_NAME = NR_GDOPP USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The Doppler shift resulting from motion of the spacecraft toward nadir at FOOTPRINT_TIME (GROSS_DOPPLER_SHIFT > 0 means the spacecraft altitude is decreasing)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPACECRAFT_POSITION_VECTOR START_BYTE = 49 DATA_TYPE = IEEE_REAL BYTES = 8 ITEMS = 3 UNIT = 'KM' OBJECT = ALIAS ALIAS_NAME = NR_SCPOS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The spacecraft position at FOOTPRINT_TIME, relative to the Venus center of mass, expressed in inertial coordinates." SCVDRANF.FMT... Page 45 END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPACECRAFT_VELOCITY_VECTOR START_BYTE = 73 DATA_TYPE = IEEE_REAL BYTES = 8 ITEMS = 3 UNIT = 'KM/SECOND' OBJECT = ALIAS ALIAS_NAME = NR_SCVEL USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The spacecraft velocity at FOOTPRINT_TIME, relative to the Venus center of mass, expressed in inertial coordinates." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SUB_SPACECRAFT_POSITION_VECTOR START_BYTE = 97 DATA_TYPE = IEEE_REAL BYTES = 8 ITEMS = 3 UNIT = 'KM' OBJECT = ALIAS ALIAS_NAME = NR_SSPOS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The position of the nadir point (on a reference sphere of 6051 km radius) at FOOTPRINT_TIME, relative to the Venus center of mass, expressed in inertial coordinates." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ALTIMETRY_ANTENNA_BORESIGHT_VECTOR START_BYTE = 121 DATA_TYPE = IEEE_REAL BYTES = 8 ITEMS = 3 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NR_ALTA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Unit vector along the axis of the altimetry antenna at FOOTPRINT_TIME, expressed in inertial coordinates." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SAR_ANTENNA_BORESIGHT_VECTOR START_BYTE = 145 DATA_TYPE = IEEE_REAL BYTES = 8 ITEMS = 3 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NR_SARA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' SCVDRANF.FMT... Page 46 END_OBJECT = ALIAS DESCRIPTION = "Unit vector along the axis of the high-gain (SAR) antenna at FOOTPRINT_TIME, expressed in inertial coordinates." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BIN_0_ROUND_TRIP_TIME START_BYTE = 169 DATA_TYPE = IEEE_REAL BYTES = 8 UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = NR_RT0 USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The round-trip light time corresponding to the first range bin (before peak detection and rotation) in the averaged altimetry echo at FOOTPRINT_TIME." END_OBJECT = COLUMN OBJECT = COLUMN NAME = INCREMENTAL_ROUND_TRIP_TIME START_BYTE = 177 DATA_TYPE = IEEE_REAL BYTES = 8 UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = NR_RPK USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The position of the echo peak with respect to the range bin used in BIN_0_ROUND_TRIP_TIME (each range bin represents an additional 0.442 microseconds of round-trip delay beyond BIN_0_ROUND_TRIP_TIME)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LATITUDE_OF_NADIR START_BYTE = 185 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = NR_LAT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The body-fixed latitude of the nadir at FOOTPRINT_TIME, in the range of -90 (South Pole) to +90 (North Pole); the nominal latitude of the footprint." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LONGITUDE_OF_NADIR START_BYTE = 189 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = NR_LON SCVDRANF.FMT... Page 47 USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The body-fixed longitude of the nadir at FOOTPRINT_TIME, in the range of 0-360. Periapsis nadir increases in longitude by about 1.48 degrees per day (about 0.2 degrees per orbit); the nominal footprint longitude." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ALONG_TRACK_ALTIMETRY_FOOTPRINT START_BYTE = 193 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'KM' OBJECT = ALIAS ALIAS_NAME = NR_XFOOT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The along-track dimension of the intersection of the 3-dB (two-way) altimetry antenna pattern with the surface when the antenna boresight is aimed at nadir (a very approximate measure of the along-track footprint dimension)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = CROSS_TRACK_ALTIMETRY_FOOTPRINT START_BYTE = 197 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'KM' OBJECT = ALIAS ALIAS_NAME = NR_YFOOT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The cross-track dimension of the intersection of the 3-dB (two-way) altimetry antenna pattern with the surface when the antenna boresight is aimed at nadir (a very approximate measure of the across-track footprint dimension)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = PIONEER_VENUS_RADIUS_AT_NADIR START_BYTE = 201 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'KM' OBJECT = ALIAS ALIAS_NAME = NR_PVRAD USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Radius of Venus at the nadir point as determined from Pioneer Venus data (provided by MIT in GIPS image format)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FIRST_ALT_BURST_USED START_BYTE = 205 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 SCVDRANF.FMT... Page 48 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NR_BLO USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the first burst included in the average altimetry echo for this record." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LAST_ALT_BURST_USED START_BYTE = 209 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NR_BHI USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the last burst included in the average altimetry echo for this record." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_OF_BURSTS_AVERAGED START_BYTE = 213 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NR_BAV USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The total number of altimeter bursts averaged to make this record." END_OBJECT = COLUMN OBJECT = COLUMN NAME = G_MATRIX_ID_NUMBER START_BYTE = 215 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NR_GNUM USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Identifies the range-Doppler-angle array used to invert the range-Doppler data in this averaged echo. G-matrices are indexed from 0." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_OF_ANGLES_IN_SOLUTION START_BYTE = 217 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NR_BLEN SCVDRANF.FMT... Page 49 USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Number of angle increments in the solution for the scattering function from this average echo." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_OF_ELEMENTS_SAVED_IN_CVM START_BYTE = 219 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NR_NCVM USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of covariance values stored in COVARIANCE_MATRIX (depends on COVARIANCE_MATRIX_FLAG in the ANF TABLE_HEADER object)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SMOOTHING_FACTOR START_BYTE = 221 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NR_GAMMA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The value of the parameter used to minimize second differences in the scattering function solution for this average echo." END_OBJECT = COLUMN OBJECT = COLUMN NAME = CHI_SQUARE_RESIDUAL_FROM_SOLUTION START_BYTE = 225 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NR_CHISQ USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The residual from the weighted least-square error inversion for the scattering function." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RMS_SURFACE_TILT_FROM_DATA START_BYTE = 229 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = NR_RMSS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS SCVDRANF.FMT... Page 50 DESCRIPTION = "RMS surface tilt theta-zero calculated from the NUMBER_OF_ANGLES_IN_SOLUTION points in the solution. This value is very sensitive to the value of NUMBER_OF_ANGLES_IN_SOLUTION." END_OBJECT = COLUMN OBJECT = COLUMN NAME = THERMAL_NOISE_ESTIMATE START_BYTE = 233 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'WATTS' OBJECT = ALIAS ALIAS_NAME = TN_SOL USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Thermal noise power estimate calculated as one of many variables in the chi-square solution for the surface scattering function SCATTERING_FUNCTION. Likely to be an overestimate since there is no attempt to account for radar clutter; THERMAL_NOISE_ESTIMATE includes contributions from Venus' surface, the radar equipment, and aliased echo signal in both time/range and frequency." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ESTIMATED_VARIANCE_OF_TN_SOL START_BYTE = 237 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'WATTS' OBJECT = ALIAS ALIAS_NAME = TN_SOLV USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Estimate of variance in THERMAL_NOISE_ESTIMATE from propagation of errors through solution procedure." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SMALLEST_RANGE_DOPPLER_ARRAY_VALUE START_BYTE = 241 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'WATTS' OBJECT = ALIAS ALIAS_NAME = TN_MIN USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Smallest value in averaged 16 by 151 (frequency by range, respectively) array of processor output power. Likely to be an underestimate, since statistical variations will force the 'minimum' below the average." END_OBJECT = COLUMN OBJECT = COLUMN NAME = AVERAGE_OF_SMALL_VALUES START_BYTE = 245 DATA_TYPE = IEEE_REAL SCVDRANF.FMT... Page 51 BYTES = 4 UNIT = 'WATTS' OBJECT = ALIAS ALIAS_NAME = TN_AVG USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The average of range echo bin values from 10-20 range bins before the echo peak (divided by 16)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MINIMUM_IN_RANGE_ECHO START_BYTE = 249 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'WATTS' OBJECT = ALIAS ALIAS_NAME = TN_R USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The minimum value in the range echo, divided by 16." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 253 BYTES = 16 END_OBJECT = COLUMN OBJECT = COLUMN NAME = DOPPLER_CENTROID START_BYTE = 269 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'HZ' OBJECT = ALIAS ALIAS_NAME = NR_DCENT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The calculated center of the spectrum of the radar receiver signal." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VARIANCE_OF_DOPPLER_CENTROID START_BYTE = 273 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'HZ' OBJECT = ALIAS ALIAS_NAME = NR_DCENTV USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Estimated variance of DOPPLER_CENTROID." END_OBJECT = COLUMN OBJECT = COLUMN NAME = DOPPLER_ROTATION_USED_FOR_SOLUTION SCVDRANF.FMT... Page 52 START_BYTE = 277 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'HZ' OBJECT = ALIAS ALIAS_NAME = NR_FROT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The offset of the echo from its nominal center bin position assumed to be due to surface effects (an integral multiple of 935 Hz, the width of a single frequency bin)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TRANSMITTER_A_FLAG START_BYTE = 281 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = CL_TXA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "If set (1), transmitter A was used; if not set (0), transmitter B was used." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RECEIVER_A_FLAG START_BYTE = 282 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = CL_RXA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "If set (1), receiver A was used; if not set (0), receiver B was used." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 283 BYTES = 2 END_OBJECT = COLUMN OBJECT = COLUMN NAME = END_TO_END_SYSTEM_CORRECTION START_BYTE = 285 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = CL_CPT0 USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The end-to-end gain of the complete altimetry radar system for a closed loop test [if the antenna were removed and the outgoing (transmitted) signal were turned directly SCVDRANF.FMT... Page 53 back to the receiver--including processing at Stanford. The value of END_TO_END_SYSTEM_CORRECTION is the measured attenuation during this test." END_OBJECT = COLUMN OBJECT = COLUMN NAME = CROSS_STRAPPING_CORRECTION START_BYTE = 289 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = CL_XSTRAP USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The attenuation caused by using transmitter A with receiver B, or vice versa." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TRANSMITTER_POWER_CORRECTION START_BYTE = 293 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = CL_DCTX USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "An estimated attenuation of the available power, relative to END_TO_END_SYSTEM_CORRECTION based on telemetered measurements of transmitter and output network temperatures." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TRANSMITTER_STAGE_1_TEMPERATURE START_BYTE = 297 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'K' OBJECT = ALIAS ALIAS_NAME = CL_TT1 USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The telemetered temperature of the Transmitter Stage 1 Driver temperature, used to compute the transmit power." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ONU_ALTIMETER_TEMPERATURE START_BYTE = 301 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'K' OBJECT = ALIAS ALIAS_NAME = CL_TOA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The telemetered temperature of SCVDRANF.FMT... Page 54 the ONU Altimeter temperature, used to compute the transmit power." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ATMOSPHERIC_ATTENUATION START_BYTE = 305 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = CL_ATMOS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The expected attenuation due to the atmosphere for this nadir elevation (PIONEER_VENUS_RADIUS_AT_NADIR)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ANTENNA_PATTERN START_BYTE = 309 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = CL_ANT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Always zero because the gain pattern of the antenna is accounted for in the G-matrix calculation." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RECEIVER_TEMPERATURE START_BYTE = 313 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'K' OBJECT = ALIAS ALIAS_NAME = CL_TRX USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Telemetered temperature of the receiver." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RECEIVER_TEMPERATURE_ATTENUATION START_BYTE = 317 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = CL_DCT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The portion of receiver attenuation that is dependent on receiver temperature." END_OBJECT = COLUMN SCVDRANF.FMT... Page 55 OBJECT = COLUMN NAME = COMMANDABLE_ATTENUATION_CODE START_BYTE = 321 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = CL_RAC USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The 3-bit code specifying the amount of attenuation used in the receiver front end." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 322 BYTES = 3 END_OBJECT = COLUMN OBJECT = COLUMN NAME = RECEIVER_COMMANDABLE_ATTENUATION START_BYTE = 325 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = CL_DCA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The actual receiver attenuation specified by the attenuation code COMMANDABLE_ATTENUATION_CODE." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TOTAL_AMPLITUDE_CORRECTION START_BYTE = 329 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = CL_CALT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The total amplitude correction expressed as an attenuation." END_OBJECT = COLUMN OBJECT = COLUMN NAME = JPL_SYNC_CODE START_BYTE = 333 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = SB_SYNC USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The JPL Sync code 0x03915ed3." SCVDRANF.FMT... Page 56 END_OBJECT = COLUMN OBJECT = COLUMN NAME = BFQ_THRESHOLD_VALUES START_BYTE = 337 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 ITEMS = 24 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = SB_THRESH USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Block Floating Point Thresholds from the SAR burst header." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 361 BYTES = 2 END_OBJECT = COLUMN OBJECT = COLUMN NAME = RADIOMETER_READING START_BYTE = 363 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = SB_RAD USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Raw value of the radiometer, measuring noise power of the high-gain antenna or, on alternating bursts, of a load at a known temperature." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RADAR_CLOCK START_BYTE = 365 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 ITEMS = 8 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = SB_RCLK USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The 52-bit spacecraft clock value." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 373 BYTES = 2 END_OBJECT = COLUMN OBJECT = COLUMN SCVDRANF.FMT... Page 57 NAME = BIT_FIELDS START_BYTE = 375 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 ITEMS = 10 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = SB_SAB_B USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Radar instrument status fields." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BUFFER_MEMORY_CHECKOUT START_BYTE = 385 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = SB_BMC_FLAG USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Buffer memory checkout flag." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 387 BYTES = 18 END_OBJECT = COLUMN OBJECT = COLUMN NAME = SCATTERING_FUNCTION START_BYTE = 405 DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 'UNK' UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NR_SIG0 USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The Sigma-zero function obtained by inverting the average altimetry radar echo from bursts FIRST_ALT_BURST_USED through LAST_ALT_BURST_USED. The function is a vector of n = NUMBER_OF_ANGLES_IN_SOLUTION numbers for the (effective) incidence angles given by SOLUTION_ANGLES." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SOLUTION_ANGLES START_BYTE = 'UNK' DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 'UNK' UNIT = 'RADIANS' OBJECT = ALIAS ALIAS_NAME = NR_ANG USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' SCVDRANF.FMT... Page 58 END_OBJECT = ALIAS DESCRIPTION = "The n = NUMBER_OF_ANGLES_IN_SOLUTION angles at which the scattering function solution has been obtained. The default angles are spaced by 0.5 degrees, starting at 0.25. That is, the solution angles are 0.25, 0.75, 1.25, 1.75, ... NUMBER_OF_ANGLES_IN_SOLUTION * 0.5-0.25 degrees; note, however, that SOLUTION_ANGLES is given in radians." END_OBJECT = COLUMN OBJECT = COLUMN NAME = COVARIANCE_MATRIX START_BYTE = 'UNK' DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 'UNK' UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NR_CVM USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Matrix of estimated covariances of SCATTERING_FUNCTION and thermal noise estimates." END_OBJECT = COLUMN END B.2. SCVDRANH.FMT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 OBJECT = COLUMN NAME = SFDU_AGGREGATE_HEADER START_BYTE = 1 DATA_TYPE = CHARACTER BYTES = 20 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_SFDU USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "'NJPL1I00000500000052', the number '0005' is registered with the NJPL SFDU authority as the 'Altimetry Inversion Header Record'." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ORBIT_NUMBER START_BYTE = 21 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_ORB USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The Magellan orbit number for the data represented in these data records." SCVDRANF.FMT... Page 59 END_OBJECT = COLUMN OBJECT = COLUMN NAME = ORBIT_VERSION START_BYTE = 25 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_VER USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The version of the altimetry data file used for these results. Obtained from the VERSION_ID keyword of the corresponding ALT-EDR Orbit Header File (Note: This turns out not to be a good indicator of the version of the data file; the Orbit Header File itself is rarely updated)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ALTINV_MAJOR_VERSION_NUMBER START_BYTE = 29 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_ALTINV_MAJOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The major software version number of the Stanford program ALTINV used to obtain the scattering function solution." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ALTINV_MINOR_VERSION_NUMBER START_BYTE = 31 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_ALTINV_MINOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The minor software version number of the Stanford program ALTINV used to obtain the scattering function solution." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ALT_MAJOR_VERSION_NUMBER START_BYTE = 33 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_ALT_MAJOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The major software version SCVDRANH.FMT... Page 60 number of the Stanford program ALT used to compute the range-Doppler array from the raw altimetry data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ALT_MINOR_VERSION_NUMBER START_BYTE = 35 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_ALT_MINOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The minor software version number of the Stanford program ALT used to compute the range-Doppler array from the raw altimetry data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = COVARIANCE_MATRIX_FLAG START_BYTE = 37 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_CVMF USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "If set (1) the upper triangular portion (in row-major order) of the covariance matrix is saved in COVARIANCE_MATRIX; if not set (0), only the diagonal is saved." END_OBJECT = COLUMN OBJECT = COLUMN NAME = INVERSION_METHOD_ID START_BYTE = 38 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_METH_INV USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The code number for the specific method of overdetermined least squares used to compute the inversions (see Section 5.4.1 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VARIANCE_ESTIMATION_METHOD_ID START_BYTE = 39 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_METH_SIG USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The code number for the method SCVDRANH.FMT... Page 61 used to estimate the statistical uncertainty in the input data. The resulting variance is used in a weighted least squares fit and propagated to form an estimate of the inverted uncertainty in the solution." END_OBJECT = COLUMN OBJECT = COLUMN NAME = CONSTRAINT_VARIANCE_METHOD_ID START_BYTE = 40 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_METH_GAMSIG USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The code number for the method used to assign weight to the smoothing constraint that controls the shape of the inversion. Determines the scale of smoothing parameter SMOOTHING_FACTOR (see Section 5.4.1 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = THERMAL_NOISE_METHOD_ID START_BYTE = 41 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_METH_THERMAL USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The code number for the method used to account for the effects of thermal noise on the observations." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NON_DELTA_SPECTRAL_FILTER_FLAG START_BYTE = 42 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_SPECF USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "If set (1), the Doppler spectrum has been convolved with an FIR filter before the inversion process. The nominal filter is [0.25 0.50 0.25] but is not saved in the SCVDR. If not set (0), no filter has been used (preferred)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = DOPPLER_ROTATION_METHOD_ID START_BYTE = 43 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_METH_FROT SCVDRANH.FMT... Page 62 USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The code number for the method used to account for unexpected Doppler shifts in the observed echo spectrum (see Section 5.4.1 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 44 BYTES = 1 END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_OF_DATA_RECORDS START_BYTE = 45 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_NREC USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of altimetry inversion records that follow this header." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RANGE_ECHO_PROCESSING_ID START_BYTE = 49 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_METH_ECHO USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The code number for the method used to process the range echo before the inversion (see Section 5.4.1 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MAXIMUM_ANGLE_METHOD_ID START_BYTE = 50 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_METH_BMAX USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The code number for the method used to determine the maximum solution angle in the inversion (see Section 5.4.1 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = PULSE_COMPRESSION_ID START_BYTE = 51 SCVDRANH.FMT... Page 63 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_HID USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The code number for the correlation kernel used in the radar pulse compression stage, before the range-Doppler array is computed (see Section 5.4.1 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = COMP_MAJOR_VERSION_ID START_BYTE = 53 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_COMP_MAJOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The major version number of the Stanford calibration software COMP used to compensate the input data for amplitude and timing effects." END_OBJECT = COLUMN OBJECT = COLUMN NAME = COMP_MINOR_VERSION_ID START_BYTE = 55 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_COMP_MINOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The minor version number of the Stanford calibration software COMP used to compensate the input data for amplitude and timing effects." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MAX_NUMBER_OF_SOLUTION_ANGLES START_BYTE = 57 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_MAXB USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The largest number of elements that will appear in any scattering function (SCATTERING_FUNCTION) in this orbit, equal to the largest value of NUMBER_OF_ANGLES_IN_SOLUTION. The maximum size in bytes is thus 4 * MAX_NUMBER_OF_SOLUTION_ANGLES." END_OBJECT = COLUMN OBJECT = COLUMN SCVDRANH.FMT... Page 64 NAME = MAX_NUMBER_OF_ELEMENTS_IN_CVM START_BYTE = 59 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = NH_MAXN USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The largest number of elements that will appear in any covariance matrix (COVARIANCE_MATRIX) in this orbit, equal to the largest value of NUMBER_OF_ELEMENTS_SAVED_IN_CVM. The maximum size in bytes is thus 4 * MAX_NUMBER_OF_ELEMENTS_IN_CVM." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 61 BYTES = 12 END_OBJECT = COLUMN END B.3. SCVDREDF.FMT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 OBJECT = COLUMN NAME = SFDU_AGGREGATE_HEADER START_BYTE = 1 DATA_TYPE = CHARACTER BYTES = 20 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_SFDU USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "'NJPL1I00002200000220', the number '0022' is registered with the NJPL SFDU authority as the 'Emissivity Data Record'. The final '00000220' signifies that the remainder of the SFDU is 220 bytes in length." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FOOTPRINT_NUMBER START_BYTE = 21 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_NFOOT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Starting from 1, the number of the Emissivity Data Record by increasing emissivity footprint time (S_C_EMISSIVITY_EPOCH), starting at 1." END_OBJECT = COLUMN SCVDRANH.FMT... Page 65 OBJECT = COLUMN NAME = SAB_NUMBER START_BYTE = 25 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_BURST USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number assigned to the burst header that contains the antenna measurement (as opposed to the calibration measurement) referenced by this Stanford emissivity data record." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FLAGS START_BYTE = 29 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_FLAGS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Stanford Emissivity Data Record Flag Values (see Table 5-16 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = S_C_EMISSIVITY_EPOCH START_BYTE = 33 DATA_TYPE = IEEE_REAL BYTES = 8 UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = ER_SCET USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The ephemeris time (seconds of TDB since J2000) at which the emissivity measurement was made." END_OBJECT = COLUMN OBJECT = COLUMN NAME = S_C_POSITION_VECTOR START_BYTE = 41 DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 3 UNIT = 'KM' OBJECT = ALIAS ALIAS_NAME = ER_SCPOS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The S/C position at S_C_EMISSIVITY_EPOCH, relative to the Venus center of mass, expressed in inertial coordinates." END_OBJECT = COLUMN SCVDREDF.FMT... Page 66 OBJECT = COLUMN NAME = ALTIMETER_POINTING_VECTOR START_BYTE = 53 DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 3 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_ALTA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The altimetry antenna pointing vector at S_C_EMISSIVITY_EPOCH expressed as a unit vector in inertial coordinates." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SAR_POINTING_VECTOR START_BYTE = 65 DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 3 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_SARA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The HGA pointing vector at S/C_EMISSIVITY_EPOCH, expressed as a unit vector in inertial coordinates." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FOOTPRINT_LATITUDE START_BYTE = 77 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = ER_LAT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The body-fixed latitude, at S_C_EMISSIVITY_EPOCH, of the boresight intercept point (obtained from the C-BIDR Processing Parameters file)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FOOTPRINT_LONGITUDE START_BYTE = 81 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = ER_LON USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The body-fixed longitude, at S/C_EMISSIVITY_EPOCH, of the boresight intercept point (obtained from the C-BIDR Processing Parameters file)." SCVDREDF.FMT... Page 67 END_OBJECT = COLUMN OBJECT = COLUMN NAME = AZIMUTH_FROM_FOOTPRINT_TO_S_C START_BYTE = 85 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = ER_AZIMUTH USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "At (FOOTPRINT_LATITUDE, FOOTPRINT_LONGITUDE) the spacecraft azimuth measured positive toward the east from local north." END_OBJECT = COLUMN OBJECT = COLUMN NAME = POLARIZATION START_BYTE = 89 DATA_TYPE = CHARACTER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_POLN USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Horizontal received ('HH') or vertical received ('VV')." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 91 BYTES = 2 END_OBJECT = COLUMN OBJECT = COLUMN NAME = FOOTPRINT_PLANETARY_RADIUS START_BYTE = 93 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'KM' OBJECT = ALIAS ALIAS_NAME = ER_RADIUS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The estimated planetary radius at the boresight intercept point (obtained from the C-BIDR Processing Parameters file)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FOOTPRINT_INCIDENCE_ANGLE START_BYTE = 97 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = ER_INC SCVDREDF.FMT... Page 68 USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The incidence angle at the boresight intercept point (obtained from the C-BIDR Processing Parameters file)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SAR_STATUS_FOR_PRECEDING_BURST START_BYTE = 101 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 ITEMS = 10 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_SS_PREV USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The original SAB header status field from the burst preceding the Antenna Measurement, of interest because the Antenna Measurement actually occurs during this burst." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SAR_STATUS_FOR_ANTENNA_BURST START_BYTE = 111 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 ITEMS = 10 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_SS_ANT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The original SAB header status field used for the radiometry (emissivity) measurement." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SAR_STATUS_FOR_CALIBRATION_BURST START_BYTE = 121 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 ITEMS = 10 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_SS_CAL USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The original SAB header status field used for the radiometry (emissivity) calibration." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TRANSMITTER_A_FLAG START_BYTE = 131 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS SCVDREDF.FMT... Page 69 ALIAS_NAME = ER_XMTA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "If set (1), transmitter A was active; if not set (0) transmitter B was active." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RECEIVER_A_FLAG START_BYTE = 132 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_RCVA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "If set (1), receiver A was active; if not set (0), receiver B was active." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ONU_A_FLAG START_BYTE = 133 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_ONUA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "If set (1), ONU A was active; if not set (0), ONU B was active." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 134 BYTES = 3 END_OBJECT = COLUMN OBJECT = COLUMN NAME = CALIBRATED_RADIOMETRY_SIGNAL START_BYTE = 137 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_S USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The difference between the antenna radiometry (emissivity) measurement ANT and the calibration measurement COMPENSATED_CALIB_MEASUREMENT (CALIBRATED_RADIOMETRY_SIGNAL = ANT - COMPENSATED_CALIB_MEASUREMENT), in units of radiometer counts. This value has been corrected for non-systematic radiometric effects, but has not been corrected for systematic errors." END_OBJECT = COLUMN OBJECT = COLUMN SCVDREDF.FMT... Page 70 NAME = CORRECTED_RADIOMETRY_SIGNAL START_BYTE = 141 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_SPRIME USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The radiometer signal after correction for systematic errors in units of radiometer counts." END_OBJECT = COLUMN OBJECT = COLUMN NAME = COMPENSATED_CALIB_MEASUREMENT START_BYTE = 145 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_CAL USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The radiometer measurement when it is connected to the reference load, in units of radiometer counts. This value has been corrected for non-systematic radiometric effects." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RECEIVER_PHYSICAL_TEMPERATURE START_BYTE = 149 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'K' OBJECT = ALIAS ALIAS_NAME = ER_TRCV USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The physical temperature of the SAR receiver as reported from telemetry in image Processing Parameter files." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SENSOR_INPUT_NOISE_TEMPERATURE START_BYTE = 153 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'K' OBJECT = ALIAS ALIAS_NAME = ER_TSI USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The system temperature of the sensor RF input port, obtained from the radiometry (emissivity) signal and compensated for receiver gain and temperature." END_OBJECT = COLUMN OBJECT = COLUMN SCVDREDF.FMT... Page 71 NAME = CABLE_TEMPERATURE_SENSORS START_BYTE = 157 DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 5 UNIT = 'K' OBJECT = ALIAS ALIAS_NAME = ER_TSEN USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The physical temperatures reported by five sensors along the cable between the antenna and the receiver front end." END_OBJECT = COLUMN OBJECT = COLUMN NAME = HGA_ANTENNA_NOISE_TEMPERATURE START_BYTE = 177 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'K' OBJECT = ALIAS ALIAS_NAME = ER_TANT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The system temperature of the HGA antenna, determined from the sensor input noise temperature and the loss and physical temperature of the HGA cable." END_OBJECT = COLUMN OBJECT = COLUMN NAME = HGA_REFLECTOR_PHYSICAL_TEMP START_BYTE = 181 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'K' OBJECT = ALIAS ALIAS_NAME = ER_THGA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "High gain antenna physical temperature obtained from engineering telemetry channel E-0100." END_OBJECT = COLUMN OBJECT = COLUMN NAME = S_BAND_FEED_PHYSICAL_TEMP START_BYTE = 185 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'K' OBJECT = ALIAS ALIAS_NAME = ER_TSFEED USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "S-Band feed physical temperature obtained from engineering telemetry channel E-0098." END_OBJECT = COLUMN OBJECT = COLUMN NAME = REFLECTED_SKY_TEMPERATURE SCVDREDF.FMT... Page 72 START_BYTE = 189 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'K' OBJECT = ALIAS ALIAS_NAME = ER_TSKY USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The sky brightness in the forward scatter (specular) direction, nominally equal to COSMIC_BACKGROUND_TEMPERATURE but computed according to TSKY_COMPUTATION_METHOD." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SOLID_ANGLE_SUBTENDED_BY_VENUS START_BYTE = 193 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'RADIANS' OBJECT = ALIAS ALIAS_NAME = ER_OMEGAV USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The solid angle subtended by the Venus disk at the spacecraft." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ONE_WAY_TRANSMISSION_RAY_PATH_TO_BIP START_BYTE = 197 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_ALPHA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The one-way power transmission factor for the atmosphere between the point at (FOOTPRINT_LATITUDE, FOOTPRINT_LONGITUDE, FOOTPRINT_PLANETARY_RADIUS) and the spacecraft using the atmospheric model." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SURFACE_PHYSICAL_TEMP START_BYTE = 201 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'K' OBJECT = ALIAS ALIAS_NAME = ER_TSURF USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The physical temperature of the surface obtained from the assumed radius at the boresight intercept point (FOOTPRINT_PLANETARY_RADIUS) and the (Magellan-adopted) model for atmospheric structure." END_OBJECT = COLUMN SCVDREDF.FMT... Page 73 OBJECT = COLUMN NAME = UPWELLING_ATMOSPHERIC_EMISSION_T START_BYTE = 205 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'K' OBJECT = ALIAS ALIAS_NAME = ER_TUP USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The effective temperature of the atmosphere resulting from self-emission along the ray path determined by the HGA." END_OBJECT = COLUMN OBJECT = COLUMN NAME = DOWNWELLING_ATMOSPHERIC_EMISSION_T START_BYTE = 209 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'K' OBJECT = ALIAS ALIAS_NAME = ER_TDN USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The effective temperature of the atmosphere observed at the surface along an incoming ray that, after specular reflection from the (average) spherical surface, would reach the spacecraft." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SURFACE_BRIGHTNESS_TEMP START_BYTE = 213 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'K' OBJECT = ALIAS ALIAS_NAME = ER_TB USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The brightness temperature of the Venus surface derived from the radiometry (emissivity) measurements." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SURFACE_BRIGHTNESS_TEMP_VARIANCE START_BYTE = 217 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_TBV USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Variance of the derived Venus brightness temperature using the method identified by VARIANCE_ESTIMATION_COMP_METHOD." END_OBJECT = COLUMN SCVDREDF.FMT... Page 74 OBJECT = COLUMN NAME = EMISSIVITY START_BYTE = 221 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_EMISS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The emissivity of the Venus surface." END_OBJECT = COLUMN OBJECT = COLUMN NAME = EMISSIVITY_VARIANCE START_BYTE = 225 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = ER_EMISSV USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Variance of the derived emissivity using the method identified by VARIANCE_ESTIMATION_COMP_METHOD." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 229 BYTES = 12 END_OBJECT = COLUMN END B.4. SCVDREDH.FMT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 OBJECT = COLUMN NAME = SFDU_AGGREGATE_HEADER START_BYTE = 1 DATA_TYPE = CHARACTER BYTES = 20 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_SFDU USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "'NJPL1I00002100000072', the number '0021' is registered with the NJPL SFDU authority as the 'Emissivity Header Record'. The '00000072' signifies that the remainder of the SFDU is 72 bytes in length." END_OBJECT = COLUMN SCVDREDF.FMT... Page 75 OBJECT = COLUMN NAME = ORBIT_NUMBER START_BYTE = 21 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_ORB USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The Magellan orbit number for the data represented in these data records." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VERSION_NUMBER START_BYTE = 25 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_VER USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The orbit version number for these data. Obtained from the VERSION_ID keyword of the corresponding C-BIDR Orbit Header File (Note: This turns out not to be a good indicator of the version of the data file; the Orbit Header File itself is rarely updated)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RADI_MAJOR_VERSION_NUMBER START_BYTE = 29 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_RADI_MAJOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the major software version of Stanford program RADI used to process these data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RADI_MINOR_VERSION_NUMBER START_BYTE = 31 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_RADI_MINOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the minor software version of Stanford program RADI used to process these data." END_OBJECT = COLUMN OBJECT = COLUMN SCVDREDH.FMT... Page 76 NAME = NUMBER_OF_DATA_RECORDS START_BYTE = 33 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_NREC USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of emissivity records in this file." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RADP_MAJOR_VERSION_NUMBER START_BYTE = 37 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_RADP_MAJOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the major software version of Stanford program RADP used to process these data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RADP_MINOR_VERSION_NUMBER START_BYTE = 39 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_RADP_MINOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the minor software version of Stanford program RADP used to process these data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ENGEX_MAJOR_VERSION_NUMBER START_BYTE = 41 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_ENGEX_MAJOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the minor software version of Stanford program ENGEX used to process these data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ENGEX_MINOR_VERSION_NUMBER START_BYTE = 43 DATA_TYPE = MSB_INTEGER BYTES = 2 SCVDREDH.FMT... Page 77 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_ENGEX_MINOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the minor software version of Stanford program ENGEX used to process these data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SABEX_MAJOR_VERSION_NUMBER START_BYTE = 45 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_SABEX_MAJOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the major software version of Stanford program SABEX used to process these data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SABEX_MINOR_VERSION_NUMBER START_BYTE = 47 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_SABEX_MINOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the minor software version of Stanford program SABEX used to process these data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RCOMP_MAJOR_VERSION_NUMBER START_BYTE = 49 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_RCOMP_MAJOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the major software version of Stanford program RCOMP used to process these data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RCOMP_MINOR_VERSION_NUMBER START_BYTE = 51 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_RCOMP_MINOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' SCVDREDH.FMT... Page 78 END_OBJECT = ALIAS DESCRIPTION = "The number of the minor software version of Stanford program RCOMP used to process these data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RADIATIVE_TRANSFER_MODEL_ID START_BYTE = 53 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_RATM_MAJOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the major software version of Stanford program RATM used to process these data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = QUATERNION_COMPUTATION_METHOD START_BYTE = 55 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_METH_QUAT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The code number for the specific method for determining the quaternion correction (if any; see Section 5.7 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = TSKY_COMPUTATION_METHOD START_BYTE = 56 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_METH_TSKY USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The code number for the specific method for determining sky temperature as seen at the surface of Venus (see Section 5.7 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VENUS_DISK_BRIGHTNESS_COMP_METHOD START_BYTE = 57 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_METH_TVENUS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The code number for the SCVDREDH.FMT... Page 79 specific method of determining the effective global temperature of Venus as seen at the spacecraft (see Section 5.7 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BEAM_EFFICIENCY_COMP_METHOD START_BYTE = 58 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_METH_BEAM_EFF USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The code number for the specific method of determining high-gain antenna beam efficiency (see Section 5.7 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = REFLECTIVITY_COMP_METHOD START_BYTE = 59 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_METH_RHO USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The code number for the specific method for estimating the surface Fresnel reflectivity appropriate for the sky brightness reflection at the surface (see Section 5.7 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VARIANCE_ESTIMATION_COMP_METHOD START_BYTE = 60 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_METH_VAR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The code number for the specific method of determining the variance expected in the estimates of Venus surface brightness and emissivity (see Section 5.7 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SYSTEMATIC_ERROR_CORRECTION_METHOD START_BYTE = 61 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_METH_SYST USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' SCVDREDH.FMT... Page 80 END_OBJECT = ALIAS DESCRIPTION = "The code number for the specific method for correcting the radiometry signal for systematic effects (such as capacitive discharge associated with altimeter bursts; see Section 5.7 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = GEOMETRY_COMPUTATION_METHOD START_BYTE = 62 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_METH_GEOM USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The code number for the specific method for computing the spacecraft position, velocity and orientation (see Section 5.7 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SOURCE_OF_TELEMETRY_INFO START_BYTE = 63 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_METH_TELEM USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The code number for the specific method for computing and conditioning the spacecraft telemetry signals (see Section 5.7 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 64 BYTES = 1 END_OBJECT = COLUMN OBJECT = COLUMN NAME = VENUS_TEMPERATURE START_BYTE = 65 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'K' OBJECT = ALIAS ALIAS_NAME = EH_TVENUS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The effective (global) brightness temperature of Venus as seen at the spacecraft (nominally 635K)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = COSMIC_BACKGROUND_TEMPERATURE SCVDREDH.FMT... Page 81 START_BYTE = 69 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'K' OBJECT = ALIAS ALIAS_NAME = EH_TCOSMIC USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The cosmic background temperature (nominally 3K) for emissivity measurements at Venus." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BEAM_EFFICIENCY START_BYTE = 73 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_BEAM_EFF USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The high-gain antenna beam efficiency used for interpreting emissivity measurements (nominally 0.8)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ANTENNA_RADIATION_EFFICIENCY START_BYTE = 77 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = EH_RAD_EFF USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The high-gain antenna radiation efficiency used for interpreting emissivity measurements (nominally 0.977)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 81 BYTES = 12 END_OBJECT = COLUMN END B.5. SCVDRGMF.FMT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 OBJECT = COLUMN NAME = SFDU_AGGREGATE_HEADER START_BYTE = 1 SCVDREDH.FMT... Page 82 DATA_TYPE = CHARACTER BYTES = 20 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GR_SFDU USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "'NJPL1I0000240000nnnn', the number '0024' is registered with the NJPL SFDU authority as the 'G-Matrix Data Record'. 'nnnn' is the length in bytes of the remainder of the SFDU, which varies from record to record." END_OBJECT = COLUMN OBJECT = COLUMN NAME = G_MATRIX_ID_NUMBER START_BYTE = 21 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GR_GNUM USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The identifier for the G-matrix. G-matrices are indexed from 0." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ORBIT_NUMBER START_BYTE = 23 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GR_ORB USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The orbit number for which the G-matrix was computed." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BURST_NUMBER_WITHIN_ORBIT START_BYTE = 25 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GR_BURST USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The burst number within orbit ORBIT_NUMBER for which the G-matrix was computed." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 29 BYTES = 4 END_OBJECT = COLUMN SCVDRGMF.FMT... Page 83 OBJECT = COLUMN NAME = BURST_TIME START_BYTE = 33 DATA_TYPE = IEEE_REAL BYTES = 8 UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = GR_SCET USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The time at which burst BURST_NUMBER_WITHIN_ORBIT was transmitted (seconds past J2000)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NADIR_LATITUDE START_BYTE = 41 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = GR_LAT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The latitude at the nadir point for the G-matrix calculation." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NADIR_LONGITUDE START_BYTE = 45 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = GR_LON USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The longitude at the nadir for the G-matrix calculation." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPACECRAFT_POSITION START_BYTE = 49 DATA_TYPE = IEEE_REAL BYTES = 8 ITEMS = 3 UNIT = 'KM' OBJECT = ALIAS ALIAS_NAME = GR_SCPOS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The spacecraft position at BURST_TIME, relative to the Venus center of mass, expressed in inertial coordinates." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPACECRAFT_VELOCITY SCVDRGMF.FMT... Page 84 START_BYTE = 73 DATA_TYPE = IEEE_REAL BYTES = 8 ITEMS = 3 UNIT = 'KM/SECOND' OBJECT = ALIAS ALIAS_NAME = GR_SCVEL USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The spacecraft velocity at BURST_TIME, relative to the Venus center of mass, expressed in inertial coordinates." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ALTIMETER_POINTING_VECTOR START_BYTE = 97 DATA_TYPE = IEEE_REAL BYTES = 8 ITEMS = 3 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GR_ALTA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The unit vector along the axis of the altimetry antenna at BURST_TIME, expressed in inertial coordinates." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SAR_POINTING_VECTOR START_BYTE = 121 DATA_TYPE = IEEE_REAL BYTES = 8 ITEMS = 3 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GR_SARA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The unit vector along the axis of the high-gain (SAR) antenna at BURST_TIME, expressed in inertial coordinates." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_OF_ANGLES START_BYTE = 145 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GR_BLEN USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of angles in the calculated G-matrix." END_OBJECT = COLUMN SCVDRGMF.FMT... Page 85 OBJECT = COLUMN NAME = NUMBER_OF_RANGES START_BYTE = 147 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GR_RLEN USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of ranges in the calculated G-matrix." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_OF_FREQUENCIES START_BYTE = 149 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GR_FLEN USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of frequencies in the calculated G-matrix (an odd number)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = HIGHEST_RANGE_ALIASING_INCLUDED START_BYTE = 151 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GR_RALIAS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The highest order of range aliasing included in the computation of the G-matrix. If 0, no aliasing was considered; if 1, the contribution due to the first range ambiguity, etc." END_OBJECT = COLUMN OBJECT = COLUMN NAME = HIGHEST_FREQ_ALIASING_INCLUDED START_BYTE = 153 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GR_FALIAS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The highest order of frequency aliasing included in the computation of the G-matrix. If 0, no aliasing was considered; if 1, the contributions due to the first positive and negative frequency aliasing, etc." END_OBJECT = COLUMN SCVDRGMF.FMT... Page 86 OBJECT = COLUMN NAME = SPARE START_BYTE = 155 BYTES = 18 END_OBJECT = COLUMN OBJECT = COLUMN NAME = ANGLE_VECTOR START_BYTE = 173 DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 'UNK' UNIT = 'RADIANS' OBJECT = ALIAS ALIAS_NAME = GR_B USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The vector of nb = NUMBER_OF_ANGLES angles for which the G-matrix was calculated (radians). Entries in ANGLE_VECTOR are monotonically increasing from an initial 0 radians, which is implicit and not included in the vector. Entries ANGLE_VECTOR[n] and ANGLE_VECTOR[n+1] thus bound the nth angle interval, which has nominal value (ANGLE_VECTOR[n] + ANGLE_VECTOR[n+1])/2." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RANGE_VECTOR START_BYTE = 'UNK' DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 'UNK' UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = GR_R USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The vector of nr = NUMBER_OF_RANGES ranges for which the G-matrix was calculated (seconds). Entries in RANGE_VECTOR are monotonically increasing from an initial 0 seconds, which is implicit and not included in the vector. Entries RANGE_VECTOR[n] and RANGE_VECTOR[n+1] thus bound the nth range interval, which has nominal value (RANGE_VECTOR[n] + RANGE_VECTOR[n+1])/2." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FREQUENCY_VECTOR START_BYTE = 'UNK' DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 'UNK' UNIT = 'HZ' OBJECT = ALIAS ALIAS_NAME = GR_F USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The vector of nf = NUMBER_OF_FREQUENCIES frequencies for which the G-matrix was calculated (Hz). Entries in FREQUENCY_VECTOR are monotonically increasing and SCVDRGMF.FMT... Page 87 denote frequencies at the centers of nominal frequency bins. FREQUENCY_VECTOR has an odd number of elements; the center element is zero and the remainder are symmetric (positive and negative frequencies) about this center value." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ANGLE_RANGE_G_MATRIX START_BYTE = 'UNK' DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 'UNK' UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GR_GBR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The (aliased) G-matrix in angle-range space, with NUMBER_OF_RANGES rows and NUMBER_OF_ANGLES columns, stored in row-major order for a total of nrb = NUMBER_OF_RANGES * NUMBER_OF_ANGLES entries. The first row is associated with the first element in RANGE_VECTOR, and each element in a row is associated with the corresponding element in ANGLE_VECTOR." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ANGLE_DOPPLER_G_MATRIX START_BYTE = 'UNK' DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 'UNK' UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GR_GBF USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The (aliased) G-matrix in angle-frequency space, with NUMBER_OF_FREQUENCIES rows and NUMBER_OF_ANGLES columns, stored in row-major order for a total of nfb = NUMBER_OF_FREQUENCIES * NUMBER_OF_ANGELES entries. The first row is associated with the first element in FREQUENCY_VECTOR, and each element in a row is associated with the corresponding element in ANGLE_VECTOR." END_OBJECT = COLUMN END B.6. SCVDRGMH.FMT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 OBJECT = COLUMN NAME = SFDU_AGGREGATE_HEADER START_BYTE = 1 DATA_TYPE = CHARACTER BYTES = 20 UNIT = 'N/A' OBJECT = ALIAS SCVDRGMF.FMT... Page 88 ALIAS_NAME = GH_SFDU USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "'NJPL1I00002300000024', the number '0023' is registered with the NJPL SFDU authority as the 'G-Matrix Header Record', '00000024' signifies that the remainder of this SFDU is 24 bytes in length." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_OF_G_MATRICES START_BYTE = 21 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GH_NG USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of G-matrices contained in this file." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MAX_DIM_ANGLE_VECTOR START_BYTE = 23 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GH_MAXB USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The largest value of NUMBER_OF_ANGLES in this file." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MAX_DIM_RANGE_VECTOR START_BYTE = 25 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GH_MAXR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The largest value of NUMBER_OF_RANGES in this file." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MAX_DIM_FREQUENCY_VECTOR START_BYTE = 27 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GH_MAXF USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' SCVDRGMH.FMT... Page 89 END_OBJECT = ALIAS DESCRIPTION = "The largest value of NUMBER_OF_FREQUENCIES in this file." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MAX_DIM_ANGLE_RANGE_G_MATRIX START_BYTE = 29 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GH_MAXBR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The largest value of the product NUMBER_OF_ANGLES * NUMBER_OF_RANGES in this file." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MAX_DIM_ANGLE_FREQUENCY_G_MATRIX START_BYTE = 33 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = GH_MAXBF USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The largest value of the product NUMBER_OF_ANGLES * NUMBER_OF_FREQUENCIES in this file." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 37 BYTES = 8 END_OBJECT = COLUMN END B.7. SCVDRIMF.FMT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 OBJECT = COLUMN NAME = SFDU_AGGREGATE_HEADER START_BYTE = 1 DATA_TYPE = CHARACTER BYTES = 20 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_SFDU USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "'NJPL1I0000120000nnnn', the designator '0012' is registered with the NJPL SFDU authority as the SCVDRGMH.FMT... Page 90 'Image Data Record'. 'nnnn' is the length in bytes of the remainder of the SFDU, which can vary from record to record." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FOOTPRINT_NUMBER START_BYTE = 21 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_NFOOT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Starting from 1, the number of the Image Data Record by increasing Image Footprint Time (FOOTPRINT_TIME)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BURST_COUNT_FOR_CLOSEST_BURST START_BYTE = 25 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_BURST USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The burst for which the Mid-Range Point is closest to the footprint center." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FLAG_FIELDS START_BYTE = 29 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_FLAGS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Stanford Image Data Record Flag Values." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FOOTPRINT_TIME START_BYTE = 33 DATA_TYPE = IEEE_REAL BYTES = 8 UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = IR_SCET USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The burst start time (seconds of TDB since J2000) for the associated burst." END_OBJECT = COLUMN SCVDRIMF.FMT... Page 91 OBJECT = COLUMN NAME = SPACECRAFT_POSITION_VECTOR START_BYTE = 41 DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 3 UNIT = 'KM' OBJECT = ALIAS ALIAS_NAME = IR_SCPOS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The spacecraft position for the associated burst, relative to the Venus center of mass and expressed in the Venus Body Fixed 1985 coordinate system." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPACECRAFT_VELOCITY_VECTOR START_BYTE = 53 DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 3 UNIT = 'KM/SECOND' OBJECT = ALIAS ALIAS_NAME = IR_SCVEL USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The spacecraft velocity for the associated burst, relative to the Venus center of mass and expressed in Venus Body Fixed 1985 coordinates." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SAR_ANTENNA_UNIT_BORESIGHT_VECTOR START_BYTE = 65 DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 3 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_BPV USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The unit vector along the axis of the SAR antenna for the associated burst, expressed in Venus Body Fixed 1985 coordinates." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BORESIGHT_INTERCEPT_POINT START_BYTE = 77 DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 3 UNIT = 'KM' OBJECT = ALIAS ALIAS_NAME = IR_BIP USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The position of the boresight SCVDRIMF.FMT... Page 92 intercept point on Venus' surface for the associated burst, expressed in Venus Body Fixed 1985 coordinates." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FOOTPRINT_LATITUDE START_BYTE = 89 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = IR_LAT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The body-fixed latitude of the footprint center, in the range of -90 (South Pole) to +90 (North Pole)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FOOTPRINT_LONGITUDE START_BYTE = 93 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = IR_LON USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The body-fixed longitude of the footprint center in the range of 0 - 360." END_OBJECT = COLUMN OBJECT = COLUMN NAME = AZIMUTH_FROM_FOOTPRINT_TO_S_C START_BYTE = 97 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = IR_AZIMUTH USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "At the footprint center (FOOTPRINT_LATITUDE, FOOTPRINT_LONGITUDE) the spacecraft azimuth measured positive toward the east from local north." END_OBJECT = COLUMN OBJECT = COLUMN NAME = POLARIZATION START_BYTE = 101 DATA_TYPE = CHARACTER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_POLN USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Horizontal transmitted and horizontal received ('HH') or vertical transmitted and vertical received ('VV')." SCVDRIMF.FMT... Page 93 END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 103 BYTES = 2 END_OBJECT = COLUMN OBJECT = COLUMN NAME = ALONG_TRACK_FOOTPRINT_SIZE START_BYTE = 105 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'KM' OBJECT = ALIAS ALIAS_NAME = IR_XFOOT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The along-track dimension of the Venus surface area described by this data record (nominally 9 C-BIDR image lines, or 2.025 km)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = CROSS_TRACK_FOOTPRINT_SIZE START_BYTE = 109 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'KM' OBJECT = ALIAS ALIAS_NAME = IR_YFOOT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The across-track dimension of the Venus surface area described by this data record." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MID_RANGE_POINT_LATITUDE START_BYTE = 113 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = IR_MRP_LAT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The latitude of the Mid-Range Point for the associated burst." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MID_RANGE_POINT_LONGITUDE START_BYTE = 117 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = IR_MRP_LON USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' SCVDRIMF.FMT... Page 94 END_OBJECT = ALIAS DESCRIPTION = "The longitude of the Mid-Range Point for the associated burst." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MID_RANGE_POINT_INCIDENCE_ANGLE START_BYTE = 121 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = IR_MRP_INC USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The incidence angle at the Mid-Range Point for the associated burst." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MID_RANGE_POINT_C1_COORDINATE START_BYTE = 125 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_MRP_C1 USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The C1 coordinate at the Mid-Range Point for the associated burst in units of 225 m pixels." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MID_RANGE_POINT_C2_COORDINATE START_BYTE = 129 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_MRP_C2 USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The C2 coordinate at the Mid-Range Point for the associated burst in units of 225 m pixels." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BIP_LATITUDE START_BYTE = 133 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = IR_BIP_LAT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The latitude at the Boresight Intercept Point for the associated burst (the Boresight Intercept Point is the point on the Venus surface where the HGA boresight would SCVDRIMF.FMT... Page 95 intercept the surface, after accounting for atmospheric refraction and the Magellan-adopted model for topography)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BIP_LONGITUDE START_BYTE = 137 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = IR_BIP_LON USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The longitude at the Boresight Intercept Point for the associated burst." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BIP_INCIDENCE_ANGLE START_BYTE = 141 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = IR_BIP_INC USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The incidence angle at the Boresight Intercept Point for the associated burst." END_OBJECT = COLUMN OBJECT = COLUMN NAME = BIP_ELEVATION START_BYTE = 145 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'KM' OBJECT = ALIAS ALIAS_NAME = IR_BIP_ELEV USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The elevation (above the 6051 km reference surface) at the Boresight Intercept Point for the associated burst." END_OBJECT = COLUMN OBJECT = COLUMN NAME = APPARENT_RANGE_S_C_TO_BIP START_BYTE = 149 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'KM' OBJECT = ALIAS ALIAS_NAME = IR_BIP_RANGE USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The apparent slant range from the spacecraft to the Boresight Intercept Point for the associated burst." SCVDRIMF.FMT... Page 96 END_OBJECT = COLUMN OBJECT = COLUMN NAME = NORMALIZING_FACTOR_FOR_PIXELS START_BYTE = 153 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_MRP_BS_COEF USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The Muhleman Law backscatter coefficient at the Mid-Range Point reported on the CBIDR tape. Note: this value was not computed correctly." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LOWEST_INCIDENCE_ANGLE START_BYTE = 157 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = IR_THETA_OFFSET USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The smallest angle represented by the scattering data array." END_OBJECT = COLUMN OBJECT = COLUMN NAME = HIGHEST_INCIDENCE_ANGLE START_BYTE = 161 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = IR_THETA_MAX USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The largest angle represented by the scattering data array." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LOWEST_ANGLE_FOR_FIT START_BYTE = 165 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = IR_THLO USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The smallest incidence angle for which at least one pixel was found in the block; the smallest incidence angle used in the polynomial fit." END_OBJECT = COLUMN SCVDRIMF.FMT... Page 97 OBJECT = COLUMN NAME = HIGHEST_ANGLE_FOR_FIT START_BYTE = 169 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = IR_THHI USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The largest incidence angle for which at least one pixel was found in the block; the largest incidence angle used in the polynomial fit." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LOWEST_VALID_BIN_FOR_ANGLE_FIT START_BYTE = 173 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_BMIN USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The smallest bin number for which data were used in the polynomial fit (0 < LOWEST_VALID_BIN_FOR_ANGLE_FIT < 99)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = HIGHEST_VALID_BIN_FOR_ANGLE_FIT START_BYTE = 174 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_BMAX USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The largest bin number for which data were used in the polynomial fit (0 < HIGHEST_VALID_BIN_FOR_ANGLE_FIT < 99)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_OF_ANGLES_IN_IR_BINS START_BYTE = 175 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_NTH USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The dimension of the array IR_BINS (equal to HIGHEST_VALID_BIN_FOR_ANGLE_FIT - LOWEST_VALID_BIN_FOR_ANGLE_FIT + 1)." END_OBJECT = COLUMN SCVDRIMF.FMT... Page 98 OBJECT = COLUMN NAME = SIZE_OF_POLYNOMIAL_FIT START_BYTE = 176 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_POLYSIZE USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of coefficients in the fitted polynomial; one more than the highest power in the polynomial." END_OBJECT = COLUMN OBJECT = COLUMN NAME = CHI_SQUARE_VALUE_FROM_LINEAR_FIT START_BYTE = 177 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_CHISQ USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The residual from the weighted least-square error fit for the polynomial." END_OBJECT = COLUMN OBJECT = COLUMN NAME = COEFFICIENTS_FOR_POLYNOMIAL_FIT START_BYTE = 181 DATA_TYPE = IEEE_REAL BYTES = 4 ITEMS = 3 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_COEFS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The coefficients for the fitted polynomial to the scattering function, which is expanded about (LOWEST_ANGLE_FOR_FIT + HIGHEST_ANGLE_FOR_FIT)/2. The first coefficient (COEFFICIENTS_FOR_POLYNOMIAL_FIT[0]) is the constant term, the second coefficient (COEFFICIENTS_FOR_POLYNOMIAL_FIT[1]) is the linear term." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LOWEST_VALID_INTENSITY_BIN START_BYTE = 193 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_IMIN USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The smallest pixel intensity represented by the pixel intensity histogram (0 < LOWEST_VALID_INTENSITY_BIN < 255)." SCVDRIMF.FMT... Page 99 END_OBJECT = COLUMN OBJECT = COLUMN NAME = HIGHEST_VALID_INTENSITY_BIN START_BYTE = 194 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_IMAX USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The highest pixel intensity represented by the pixel intensity histogram (0 < HIGHEST_VALID_INTENSITY_BIN < 255)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_OF_LEVELS_IN_IR_I_COUNT START_BYTE = 195 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_NI USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The dimension of array HISTOGRAM_OF_PIXEL_VALUES (NUMBER_OF_LEVELS_IN_IR_I_COUNT = HIGHEST_VALID_INTENSITY_BIN - LOWEST_VALID_INTENSITY_BIN + 1)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 196 BYTES = 13 END_OBJECT = COLUMN OBJECT = COLUMN NAME = CUMULATIVE_INTENSITY START_BYTE = 209 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_INTEN USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The sum of the intensities of all pixels assigned to this incidence angle bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_OF_PIXELS START_BYTE = 213 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_COUNT SCVDRIMF.FMT... Page 100 USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of pixels assigned to this incidence angle bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = STANDARD_DEVIATION START_BYTE = 217 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_SDEV USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The standard deviation of the weighted intensities for this incidence angle bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = HISTOGRAM_OF_PIXEL_VALUES START_BYTE = 221 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 ITEMS = 'UNK' UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IR_I_COUNT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "For up to 256 Intensity Levels, the number of pixels at each of m = NUMBER_OF_LEVELS_IN_IR_I_COUNT intensity levels." END_OBJECT = COLUMN END B.8. SCVDRIMH.FMT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 OBJECT = COLUMN NAME = SFDU_AGGREGATE_HEADER START_BYTE = 1 DATA_TYPE = CHARACTER BYTES = 20 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IH_SFDU USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "'NJPL1I00001000000040', the number '0010' is registered with the NJPL SFDU authority as the 'Image Header Record'. '00000040' indicates that the remainder of this SFDU is 40 bytes in length." END_OBJECT = COLUMN SCVDRIMF.FMT... Page 101 OBJECT = COLUMN NAME = ORBIT_NUMBER START_BYTE = 21 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IH_ORB USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The Magellan orbit number for the data represented in these data records." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VERSION_NUMBER START_BYTE = 25 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IH_VER USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The version of the image data file used for these results. Obtained from the VERSION_ID keyword of the corresponding C-BIDR (or F-BIDR) Orbit Header File (Note: This turns out not to be a good indicator of the version of the data file; the Orbit Header File itself is rarely updated)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_OF_IMAGE_DATA_RECORDS START_BYTE = 29 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IH_NREC USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of image records that follow this header." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_OF_IMAGE_LINES_PER_RECORD START_BYTE = 33 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IH_SQLSIDE USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of C-BIDR (or F-BIDR) image lines compressed to form one output processed record (nominally 9)." END_OBJECT = COLUMN SCVDRIMH.FMT... Page 102 OBJECT = COLUMN NAME = SOURCE_DATA_TYPE START_BYTE = 37 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IH_BIDRF USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Set to binary 0 if source data are from an F-BIDR, set to 1 if from a C-BIDR." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FITTING_METHOD_FLAG START_BYTE = 38 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IH_LSQR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Zero for chi-square fitting to determine polynomial coefficients, 1 for linear least squares fitting." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RMAP_MAJOR_SOFTWARE_VERSION START_BYTE = 39 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IH_RMAP_MAJOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The major software version number of the Stanford program RMAP used to obtain the scattering function from the image data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RMAP_MINOR_SOFTWARE_VERSION START_BYTE = 41 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IH_RMAP_MINOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The minor software version number of the Stanford program RMAP used to obtain the scattering function from the image data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MAX_NUMBER_OF_ANGLES SCVDRIMH.FMT... Page 103 START_BYTE = 43 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IH_MAXB USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The largest value of NUMBER_OF_ANGLES_IN_IR_BINS that will appear in this orbit." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MAX_HISTOGRAM_SIZE START_BYTE = 45 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = IH_MAXI USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The largest value of NUMBER_OF_LEVELS_IN_I_COUNT that will appear in this orbit." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 47 BYTES = 14 END_OBJECT = COLUMN END B.9. SCVDRNFF.FMT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 OBJECT = COLUMN NAME = SFDU_AGGREGATE_HEADER START_BYTE = 1 DATA_TYPE = CHARACTER BYTES = 20 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FR_SFDU USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "'NJPL1I0000080000nnnn', the number '0008' is registered with the NJPL SFDU authority as the 'Inversion Fit Data Record'. 'nnnn' is the length in bytes of the remainder of the SFDU, which can vary from record to record." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FOOTPRINT_NUMBER START_BYTE = 21 SCVDRIMH.FMT... Page 104 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FR_NFOOT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Starting from 1, the number of the Inversion Fit Data Record; equal to the Footprint Number FOOTPRINT_NUMBER in the corresponding Altimetry Inversion Data Record." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_OF_SCATTERING_LAWS START_BYTE = 25 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FR_NLAW USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of synthetic scattering laws compared against the scattering solution; 'synthetic' scattering laws can include Hagfors, exponential, Gaussian, Rayleigh, and Muhleman.." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 29 BYTES = 4 END_OBJECT = COLUMN OBJECT = CONTAINER NAME = SCATTERING_LAW_FITS_CONTAINER START_BYTE = 33 BYTES = 36 REPETITIONS = 'UNK' OBJECT = ALIAS ALIAS_NAME = FR_SSLF_T USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "A collection of best fit scattering models to the observed scattering law in the SCATTERING_FUNCTION array of the corresponding ANF file. The fits are made using the formal ANF COVARIANCE_MATRIX. The number of repetitions is NUMBER_OF_SCATTERING_LAWS and each repetition contains the results of a single least-squares fit of the empirical scattering function to a particular scattering model." OBJECT = COLUMN NAME = SCATTERING_LAW_ID START_BYTE = 1 DATA_TYPE = CHARACTER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FR_SLAW SCVDRNFF.FMT... Page 105 USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "A 4-letter identifier for one of several analytic scattering functions which can be fitted to FR_SIG0." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FLAG_FIELDS_FOR_FIT START_BYTE = 5 DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FR_FLAGS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Stanford Inversion Fit Record Flag Values." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FIT_PARAMETER_1 START_BYTE = 9 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FR_P1 USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Scattering law parameter #1." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FIT_PARAMETER_1_VARIANCE START_BYTE = 13 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FR_P1V USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Variance in FIT_PARAMETER_1." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FIT_PARAMETER_2 START_BYTE = 17 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FR_P2 USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Scattering law parameter #2." END_OBJECT = COLUMN OBJECT = COLUMN SCVDRNFF.FMT... Page 106 NAME = FIT_PARAMETER_2_VARIANCE START_BYTE = 21 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FR_P2V USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Variance in FIT_PARAMETER_2." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RMS_SLOPE START_BYTE = 25 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'RADIANS' OBJECT = ALIAS ALIAS_NAME = FR_RMSS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "RMS Tilt for Fitted Function." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RMS_SLOPE_VARIANCE START_BYTE = 29 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FR_RMSV USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Variance of RMS_SLOPE." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RESIDUAL_ERROR_IN_FIT START_BYTE = 33 DATA_TYPE = IEEE_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FR_RESID USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Residual between analytic function and scattering function from inversion of data for best choices of FIT_PARAMETER_1 and FIT_PARAMETER_2." END_OBJECT = COLUMN END_OBJECT = CONTAINER END SCVDRNFF.FMT... Page 107 B.10. SCVDRNFH.FMT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 OBJECT = COLUMN NAME = SFDU_AGGREGATE_HEADER START_BYTE = 1 DATA_TYPE = CHARACTER BYTES = 20 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_SFDU USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "'NJPL1I00000700000052', the number '0007' is registered with the NJPL SFDU authority as the 'Stanford Inversion Fit Header Record'. '00000052' signifies that the remainder of this SFDU is 52 bytes in length." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ORBIT_NUMBER START_BYTE = 21 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_ORB USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The orbit number for the data to be fit." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ORBIT_VERSION START_BYTE = 25 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_VER USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The version number for the altimetry data file used in this processing. Obtained from the VERSION_ID keyword of the corresponding ALT-EDR Orbit Header File (Note: This turns out not to be a good indicator of the version of the data file; the Orbit Header File itself is rarely updated)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SSLFIT_MAJOR_VERSION_NUMBER START_BYTE = 29 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS SCVDRNFH.FMT... Page 108 ALIAS_NAME = FH_SSLFIT_MAJOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the major software version of Stanford program SSLFIT used to fit these data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SSLFIT_MINOR_VERSION_NUMBER START_BYTE = 31 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_SSLFIT_MINOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the minor software version of Stanford program SSLFIT used to fit these data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ALTINV_MAJOR_VERSION_NUMBER START_BYTE = 33 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_ALTINV_MAJOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the major software version of Stanford program ALTINV that produced the scattering function solutions." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ALTINV_MINOR_VERSION_NUMBER START_BYTE = 35 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_ALTINV_MINOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the minor software version of Stanford program ALTINV that produced the scattering function solutions." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ALT_MAJOR_VERSION_NUMBER START_BYTE = 37 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_ALT_MAJOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' SCVDRNFH.FMT... Page 109 END_OBJECT = ALIAS DESCRIPTION = "The number of the major software version of Stanford program ALT used to carry out the range-Doppler processing on these data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ALT_MINOR_VERSION_NUMBER START_BYTE = 39 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_ALT_MINOR USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of the minor software version of Stanford program ALT used to carry out the range-Doppler processing on these data." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_OF_RECORDS_IN_FILE START_BYTE = 41 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_NREC USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of inversions (solutions for the surface scattering law) and hence, the number of fitted result records in this file; equal to NUMBER_OF_DATA_RECORDS." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_OF_SYNTHETIC_SCATTERING_LAWS START_BYTE = 45 DATA_TYPE = MSB_INTEGER BYTES = 2 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_NLAW USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of synthetic scattering laws compared against the scattering solution; 'synthetic' scattering laws can include Hagfors, exponential, Gaussian, Rayleigh, and Muhleman." END_OBJECT = COLUMN OBJECT = COLUMN NAME = INVERSION_METHOD_ID START_BYTE = 47 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_METH_INV SCVDRNFH.FMT... Page 110 USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The identifier for inversion method (carried forward from corresponding Altimetry Inversion Header Record; see Section 5.4.1 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VARIANCE_ESTIMATION_METHOD_ID START_BYTE = 48 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_METH_SIG USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The identifier for variance estimation technique (carried forward from the corresponding Altimetry Inversion Header Record; see Section 5.4.1 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = CONSTRAINT_VARIANCE_METHOD_ID START_BYTE = 49 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_METH_GAMSIG USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The identifier for variance constraint technique (carried forward from the corresponding Altimetry Inversion Header Record; see Section 5.4.1 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = THERMAL_NOISE_METHOD_ID START_BYTE = 50 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_METH_THERMAL USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The identifier for thermal noise estimation technique (carried forward from corresponding Altimetry Inversion Header Record; see Section 5.4.1 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = DOPPLER_ROTATION_METHOD_ID START_BYTE = 51 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_METH_FROT SCVDRNFH.FMT... Page 111 USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The identifier for Doppler rotation technique (carried forward from the corresponding Altimetry Inversion Header Record; see Section 5.4.1 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = RANGE_ECHO_PROCESSING_ID START_BYTE = 52 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_METH_ECHO USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The identifier for range echo processing technique (carried forward from the corresponding Altimetry Inversion Header Record; see Section 5.4.1 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = MAXIMUM_ANGLE_METHOD_ID START_BYTE = 53 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_METH_BMAX USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The identifier for technique to set maximum incidence angle in solution (carried forward from corresponding Altimetry Inversion Header Record; see Section 5.4.1 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NON_DELTA_SPECTRAL_FILTER_FLAG START_BYTE = 54 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = FH_SPECF USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "Set if Doppler spectrum was filtered before the inversion (carried forward from corresponding Altimetry Inversion Header Record; see Section 5.4.1 of the SCVDR SIS)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 55 BYTES = 18 END_OBJECT = COLUMN END SCVDRNFH.FMT... Page 112 B.11. SCVDROHF.FMT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 OBJECT = COLUMN NAME = SFDU_LABEL_AND_LENGTH START_BYTE = 1 DATA_TYPE = CHARACTER BYTES = 20 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = HR_SFDU USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "'NJPL1I00000400000260', the designator '0004' is registered with the NJPL SFDU authority as the 'Orbit Header Record'. '00000260' indicates that the remainder of the SFDU is 260 bytes in length.." END_OBJECT = COLUMN OBJECT = COLUMN NAME = ORBIT_NUMBER START_BYTE = 21 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = HR_ORB USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The Magellan Orbit Number corresponding to the following five files (altimetry inversion, inversion fit, sinusoidal image, oblique sinusoidal image, and emissivity). An orbit begins at apoapsis, and the number corresponds to the input data from the corresponding ALT-EDR and/or C-BIDR or F-BIDR tape(s)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_ALTIMETRY_INVERSION_RECS START_BYTE = 25 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = HR_NINV USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of NR_REC SFDU's in this orbit's Altimetry Inversion File." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_INVERSION_FIT_RECS START_BYTE = 29 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' SCVDRNFH.FMT... Page 113 OBJECT = ALIAS ALIAS_NAME = HR_NFIT USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of FR_REC SFDU's in this orbit's Inversion Fit File; FR_NREC and NR_NREC should be the same." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_SIN_IMAGE_DATA_RECS START_BYTE = 33 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = HR_NISMG USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of IR_REC SFDU's in this orbit's Sinusoidal Image Data File." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_OBL_IMAGE_DATA_RECS START_BYTE = 37 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = HR_NIOMG USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of IR_REC SFDU's in this orbit's Oblique Image Data File." END_OBJECT = COLUMN OBJECT = COLUMN NAME = NUMBER_EMISSIVITY_DATA_RECS START_BYTE = 41 DATA_TYPE = MSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = HR_NEMS USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The number of ER_REC SFDU's in this orbit's Emissivity Data File." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 45 BYTES = 4 END_OBJECT = COLUMN OBJECT = COLUMN NAME = FIRST_INVERSION_FOOTPRINT_TIME START_BYTE = 49 DATA_TYPE = IEEE_REAL SCVDROHF.FMT... Page 114 BYTES = 8 UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = HR_INV_START USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The S/C ephemeris time (seconds of TDB since J2000) that represents the first altimeter inversion footprint of this orbit. It is equal to the NR_SCET value in the first NR_REC record of this orbit's Altimetry Inversion File." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LAST_INVERSION_FOOTPRINT_TIME START_BYTE = 57 DATA_TYPE = IEEE_REAL BYTES = 8 UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = HR_INV_END USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The S/C ephemeris time (seconds of TDB since J2000) that represents the last altimeter inversion footprint of this orbit. It is equal to the NR_SCET value in the last NR_REC record of this orbit's Altimetry Inversion File." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FIRST_FIT_FOOTPRINT_TIME START_BYTE = 65 DATA_TYPE = IEEE_REAL BYTES = 8 UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = HR_FIT_START USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The S/C ephemeris time (seconds of TDB since J2000) that represents the first inversion fit footprint of this orbit. It is equal to the NR_SCET value in the first NR_REC record of this orbit's Altimetry Inversion File." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LAST_FIT_FOOTPRINT_TIME START_BYTE = 73 DATA_TYPE = IEEE_REAL BYTES = 8 UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = HR_FIT_END USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The S/C ephemeris time (seconds of TDB since J2000) that represents the last inversion fit footprint of this orbit. It is equal to the NR_SCET value in the last NR_REC record of this orbit's Altimetry Inversion File." END_OBJECT = COLUMN SCVDROHF.FMT... Page 115 OBJECT = COLUMN NAME = FIRST_SIN_IMAGE_FOOTPRINT_TIME START_BYTE = 81 DATA_TYPE = IEEE_REAL BYTES = 8 UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = HR_SIMG_START USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The S/C ephemeris time (seconds of TDB since J2000 that represents the first sinusoidal image footprint of this orbit. It is equal to the IR_SCET value in the first IR_REC record of this orbit's sinusoidal image data file." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LAST_SIN_IMAGE_FOOTPRINT_TIME START_BYTE = 89 DATA_TYPE = IEEE_REAL BYTES = 8 UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = HR_SIMG_END USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The S/C ephemeris time (seconds of TDB since J2000) that represents the last sinusoidal image footprint of this orbit. It is equal to the IR_SCET value in the last IR_REC record of this orbit's sinusoidal image data file." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FIRST_OBL_IMAGE_FOOTPRINT_TIME START_BYTE = 97 DATA_TYPE = IEEE_REAL BYTES = 8 UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = HR_OIMG_START USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The S/C ephemeris time (seconds of TDB since J2000) that represents the first oblique image footprint of this orbit. It is equal to the IR_SCET value in the first IR_REC record of this orbit's oblique image data file." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LAST_OBL_IMAGE_FOOTPRINT_TIME START_BYTE = 105 DATA_TYPE = IEEE_REAL BYTES = 8 UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = HR_OIMG_END USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The S/C ephemeris time (seconds of TDB since J2000) that represents the last oblique image SCVDROHF.FMT... Page 116 footprint of this orbit. It is equal to the IR_SCET value in the last IR_REC record of this orbit's oblique image data file." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FIRST_EMISSIVITY_FOOTPRINT_TIME START_BYTE = 113 DATA_TYPE = IEEE_REAL BYTES = 8 UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = HR_EMS_START USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The S/C ephemeris time (seconds of TDB since J2000) of the first emissivity measurement of this orbit. It is equal to the ER_SCET value in the first ER_REC record of this orbit's emissivity data file." END_OBJECT = COLUMN OBJECT = COLUMN NAME = LAST_EMISSIVITY_FOOTPRINT_TIME START_BYTE = 121 DATA_TYPE = IEEE_REAL BYTES = 8 UNIT = 'SECONDS' OBJECT = ALIAS ALIAS_NAME = HR_EMS_END USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The S/C ephemeris time (seconds of TDB since J2000) of the last emissivity measurement of this orbit. It is equal to the ER_SCET value in the last ER_REC record of this orbit's emissivity data file." END_OBJECT = COLUMN OBJECT = COLUMN NAME = AVERAGE_ORBIT_PERIAPSIS_TIME START_BYTE = 129 DATA_TYPE = CHARACTER BYTES = 15 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = HR_AVG_SCLK USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The periapsis time of the predicted orbit in spacecraft clock units." END_OBJECT = COLUMN OBJECT = COLUMN NAME = AVERAGE_SEMI_MAJOR_AXIS START_BYTE = 144 DATA_TYPE = CHARACTER BYTES = 23 UNIT = 'KM' OBJECT = ALIAS ALIAS_NAME = HR_AVG_SMA USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS SCVDROHF.FMT... Page 117 DESCRIPTION = "The semi-major axis of the predicted orbit." END_OBJECT = COLUMN OBJECT = COLUMN NAME = AVERAGE_ECCENTRICITY START_BYTE = 167 DATA_TYPE = CHARACTER BYTES = 23 UNIT = 'N/A' OBJECT = ALIAS ALIAS_NAME = HR_AVG_ECC USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The eccentricity of the predicted orbit." END_OBJECT = COLUMN OBJECT = COLUMN NAME = AVERAGE_INCLINATION START_BYTE = 190 DATA_TYPE = CHARACTER BYTES = 23 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = HR_AVG_INCL USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The inclination of the predicted orbit with respect to the xy-plane of the J2000 coordinate system." END_OBJECT = COLUMN OBJECT = COLUMN NAME = AVERAGE_ASCENDING_NODE_LONGITUDE START_BYTE = 213 DATA_TYPE = CHARACTER BYTES = 23 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = HR_AVG_LON USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The angle in the xy-plane of the J2000 coordinate system to the ascending node of the predicted orbit." END_OBJECT = COLUMN OBJECT = COLUMN NAME = AVERAGE_ARGUMENT_OF_PERIAPSIS START_BYTE = 236 DATA_TYPE = CHARACTER BYTES = 23 UNIT = 'DEGREES' OBJECT = ALIAS ALIAS_NAME = HR_AVG_ARG USAGE_NOTE = 'MAGELLAN STANFORD SCVDR SIS' END_OBJECT = ALIAS DESCRIPTION = "The angle in the plane of the predicted orbit from the ascending node in the xy-plane of the J2000 SCVDROHF.FMT... Page 118 coordinate system to the periapsis." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE START_BYTE = 259 BYTES = 22 END_OBJECT = COLUMN END SCVDROHF.FMT... Page 119 APPENDIX C EXAMPLES OF OTHER FILES C.1. AAREADME.TXT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 SPACECRAFT_NAME = MAGELLAN TARGET_NAME = VENUS OBJECT = TEXT PUBLICATION_DATE = 1995-01-01 NOTE = "MAGELLAN SCVDR ARCHIVE CD-WO" END_OBJECT = TEXT END MAGELLAN SCVDR ARCHIVE CD-WO 1. Introduction This CD-WO contains Magellan SCVDR (Surface Characteristics Vector Data Record) products. It also contains documentation files which describe the SCVDRs. Each SCVDR data directory contains altimetry, oblique backscatter, and radiometry measurements for a single orbit, along with the ancillary files necessary to understand the data. The SCVDR products archived on this volume are the exact products released by the Magellan Project. However, all data files have been suffixed with ASCII carat characters ('^', decimal 94) to make them a multiple of 32500 bytes in length (to assist VAX-VMS users). Errors and anomalies are noted where detected. Supporting documentation and label files conform to the Planetary Data System (PDS) Standards, Version 3.0, Jet Propulsion Laboratory (JPL) document JPL D-7669. 2. Disk Format The disk has been formatted so that a variety of computer systems (e.g. IBM PC, Macintosh, Sun) may access the data. Specifically, it is formatted according to the ISO 9660 level 1 Interchange Standard. For further information, refer to the ISO 9660 Standard Document: RF# ISO 9660-1988, 15 April 1988. 3. File Formats Each orbit for which SCVDR data exist is represented by a set of up to 6 data files copied from the SCVDR tape product: ANFnnnnn.v - Altimetry Inversion File, generated from the ALT-EDR raw altimetry data records, using the G-Matrices in a GMF file in the [GEOMETRY] directory on this volume. EDFnnnnn.v - Emissivity File, generated from the radiometric SCVDROHF.FMT... Page 120 mode of the Magellan radar, either from the ALT-EDR or C-BIDR data records. NFFnnnnn.v - Altimetry Inversion Fit File, generated from the ANF file of the same orbit and version number. OHFnnnnn.v - Orbit Header File, describing the other files of this orbit and version number. OIFnnnnn.v - Oblique Sinusoidal Image File, derived from the polar image file of the C-BIDR (Compressed basic image data record) product by fitting the SAR backscatter values to a polynomial in incidence angle. SIFnnnnn.v - Sinusoidal Image File, derived from the non-polar image file of the C-BIDR (Compressed basic image data record) product by fitting the SAR backscatter values to a polynomial in incidence angle. where 'nnnnn' represents the orbit number, and 'v' the numeric version number. The content of each file is described in a detached PDS label, a file with the same 8-letter name and an extension of "LBL". Further information on SCVDR file formats and their contents can be obtained from the Magellan Software Interface Specification document SU-MGN-SCVDR, version 1.0, October 1, 1992. All document files (*.TXT) and detached label files (*.LBL) contain 80-byte fixed-length records, with a carriage return character (ASCII 13) in the 79th byte and a line feed character (ASCII 10) in the 80th byte. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. This allows the files to be read by the MacOS, DOS, Unix, and VMS operating systems. The PDS label file has the same name as the data file it describes, with the extension .LBL. PDS labels are object-oriented. The object to which the label refers (e.g. HEADER, TABLE, etc.) is denoted by a statement of the form: ^object = location in which the carat character (^, also called a pointer in this context) indicates that the object starts at the given location. In an embedded label, the location is an integer representing the starting record number of the object (the first record in the file is record 1). In a detached label, the location denotes the name of the file containing the object, along with the starting record or byte number. For example: ^TABLE = ("ANF01000.1",312) indicates that the TABLE object begins at byte 312 of the file ANF01000.1, in the same directory as the detached label file. Below is a list of the possible formats that use the ^object keyword. ^object = n ^object = n AAREADME.TXT... Page 121 ^object = ("filename.ext",n) ^object = ("filename.ext",n) where n is the starting record or byte number of the object, counting from the beginning of the file (record 1, byte 1). indicates that the number given is in units of bytes. filename is the upper-case file name. ext is the upper-case file extension. 4. CD-ROM Contents The files on this CD-ROM are organized in one top-level directory with several subdirectories. The following table shows the structure and content of these directories. In the table, directory names are enclosed in square brackets ([]), upper-case letters indicate an actual directory or file name, and lower-case letters indicate the general form of a set of directory or file names. FILE CONTENTS Top-level directory | |- AAREADME.TXT The file you are reading. | |- ERRATA.TXT Overview of errors on this, and previous, | volumes of SCVDRCD products. | |- VOLDESC.CAT A description of the contents of this CD-ROM | volume in a format readable by both human and | computers. | |- [CATALOG] A directory containing information about the | | Magellan SCVDR dataset. | | | |- CATINFO.TXT Description of contents of the CATALOG directory. | | | |- DATASET.CAT PDS dataset catalog object | | | |- INST.CAT PDS instrument catalog object | | | |- INSTHOST.CAT PDS spacecraft catalog object | | | |- MISSION.CAT PDS mission catalog object | | | |- PERSONEL.CAT PDS personnel catalog object | | | `- REFS.CAT PDS reference catalog object | |- [DOCUMENT] A directory containing document files relating | | to this disk. | | | |- SCVDR.ASC A machine readable version of the SU-MGN-SCVDR | | SIS document describing the format and content of | | the Magellan SCVDR Products. | | | |- SCVDR.LBL A detached PDS label file describing SCVDR.ASC | | and SCVDR.PS. AAREADME.TXT... Page 122 | | | |- SCVDR.PS A copy of SCVDR.ASC in PostScript format, | | suitable for previewing on a high-resolution | | graphics terminal or direct printing on a | | laser printer or photo-typesetter. | | | |- SCVDRCD.ASC A machine readable version of the PDS-GEO-SCVDRCD | | SIS document describing the format of the | | Magellan SCVDRCD Archive CD-WO volumes. | | | |- SCVDRCD.LBL A detached PDS label file describing SCVDRCD.ASC | | and SCVDRCD.PS. | | | |- SCVDRCD.PS A copy of SCVDRCD.ASC in PostScript format, | | suitable for previewing on a high-resolution | | graphics terminal or direct printing on a | | laser printer or photo-typesetter. | | | `- DOCINFO.TXT Description of contents of the DOCUMENT directory. | |- [GEOMETRY] A directory containing the G-Matrix files used to | | generate the ANF data files on this volume. | | | |- GEOMINFO.TXT Description of the contents of this directory. | | | |- GMFnnnnn.v G-Matrix file used to generate ANF data files. | | | `- GMFnnnnn.LBL Description of GMFnnnnn.v. | |- [INDEX] A directory containing information about the | | contents of this CD-WO volume. | | | |- CUMINDEX.LBL Description of CUMINDEX.TAB. | | | |- CUMINDEX.TAB Cumulative index of all SCVDR archive data files. | | | |- INDEX.LBL Description of INDEX.TAB. | | | |- INDEX.TAB Index of SCVDR archive data files on this volume. | | | `- INDXINFO.TXT Description of the contents of the INDEX directory. | |- [LABEL] A directory containing information on PDS formats | | beyond what is in individual detached LBL files. | | | |- SCVDRANF.FMT Format of ANF data records. | | | |- SCVDRANH.FMT Format of the ANF header record. | | | |- SCVDREDF.FMT Format of EDF data records. | | | |- SCVDREDH.FMT Format of the EDF header record. | | | |- SCVDRGMF.FMT Format of GMF data records. | | | |- SCVDRGMH.FMT Format of the GMF header record. | | | |- SCVDRIMF.FMT Format of SIF and OIF data records. | | | |- SCVDRIMH.FMT Format of the SIF and OIF header record. AAREADME.TXT... Page 123 | | | |- SCVDRNFF.FMT Format of NFF data records. | | | |- SCVDRNFH.FMT Format of the NFF header record. | | | |- SCVDROHF.FMT Format of the single OHF data record. | | | `- LABINFO.TXT Description of contents of the LABEL directory. | |- [SOFTWARE] A directory containing C-language source code | | for reading SCVDR data files. | | | |- MAKEFILE.MAK Script used by the UNIX "make" command to | | generate executables from these source files. | | | |- SCV_RDR.C Low level routines to read SCVDR data files into | | the structures defined in SCVDR.H | | | |- SCV_RDR.I Function definition skeleton for SCV_RDR.C. | | | |- SCVDR.H Definition of SCVDR data structures. | | | |- SCVDRSCN.PL Perl script to list contents of SCVDR data files. | | | |- SCVPARSE.C Low level routines to parse SFDU structures. | | | |- SCVPARSE.H Definition of SFDU header structures. | | | |- SCVPARSE.I Function definition skeleton for SCVPARSE.C. | | | |- SOFTINFO.TXT Description of contents of the SOFTWARE directory. | | | |- TESTANF.C A program that illustrates how to read an | | altimetry inversion file. | | | |- TESTEDF.C A program that illustrates how to read an | | emissivity file. | | | |- TESTGMF.C A program that illustrates how to read a | | G-matrix file. | | | |- TESTIF.C A program that illustrates how to read an | | image data file. | | | |- TESTNFF.C A program that illustrates how to read an | | inversion fit file. | | | |- TESTOHF.C A program that illustrates how to read an | | orbit header file. | | | `- TYPES.H Miscellaneous SCVDR definitions. | `- [Snnnn_vv] Directories containing SCVDR data files for | orbit `nnnn', version `vv'. | |- ANFnnnnn.v Altimetry Inversion File |- EDFnnnnn.v Emissivity File |- NFFnnnnn.v Altimetry Inversion Fit File |- OHFnnnnn.v Orbit Header File |- OIFnnnnn.v Oblique Sinusoidal Image File AAREADME.TXT... Page 124 |- SIFnnnnn.v Sinusoidal Image File `- tttnnnnn.LBL PDS labels for the data files 5. Whom to Contact for Information For questions concerning this volume set: G. Leonard Tyler Stanford University Center for Radar Astronomy Durand Bldg., Room 213 Stanford, CA 94305-4055 Telephone: 415-723-3535 Datafax: 415-723-9251 Internet: len@nova.stanford.edu Richard Simpson Stanford University Center for Radar Astronomy Durand Bldg., Room 232 Stanford, CA 94305-4055 Telephone: 415-723-3525 Datafax: 415-723-9251 Internet: rsimpson@magellan.stanford.edu 6. Cognizant Persons Magellan Raymond Arvidson Archive Project McDonnell Center for the Space Sciences Coordinator Department of Earth and Planetary Sciences Washington University St. Louis, MO 63130 SCVDR Data, Richard Simpson documentation Stanford University Center for Radar Astronomy Durand Bldg., Room 232 Stanford, CA 94305-4055 Volume generation, Peter Ford and Joan Quigley validation, labels, MIT 37-601, Cambridge, MA 02139-4307 catalog templates Internet: pds-requests@space.mit.edu This disk was produced at MIT by Peter Ford and Joan Quigley. C.2. CATINFO.TXT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM SPACECRAFT_NAME = MAGELLAN TARGET_NAME = VENUS OBJECT = TEXT PUBLICATION_DATE = 1995-01-01 NOTE = "MAGELLAN SCVDR ARCHIVE CD-WO" AAREADME.TXT... Page 125 END_OBJECT = TEXT END DESCRIPTION OF CATALOG FILES ON THIS VOLUME This file describes the files present in the [CATALOG] directory on this volume. The files are: DATASET.CAT - PDS dataset catalog object INSTHOST.CAT - PDS spacecraft catalog object MISSION.CAT - PDS mission catalog object PERSONEL.CAT - PDS personnel catalog object REFS.CAT - PDS reference catalog object INST.CAT - PDS instrument catalog object C.3. DATASET.CAT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 OBJECT = DATA_SET DATA_SET_ID = "MGN-V-RDRS-5-SCVDR-V1.0" OBJECT = DATA_SET_INFORMATION DATA_SET_NAME = "MAGELLAN SURFACE CHARACTERISTICS VECTOR DATA RECORD" DATA_SET_COLLECTION_MEMBER_FLG = "N" START_TIME = 1990-09-15T16:22:14 STOP_TIME = 1992-09-14T02:28:41 DATA_SET_RELEASE_DATE = 1995-01-01 PRODUCER_FULL_NAME = "DR. G. LEONARD TYLER" DETAILED_CATALOG_FLAG = "N" DATA_SET_DESC = " Data Set Overview ================= The Surface Characteristics Vector Data Record (SCVDR) is an orbit-by-orbit reduction of Magellan scattering and emission measurements carried out at Stanford University. The SCVDR includes near-nadir scattering functions obtained by numerical inversion from altimetry (ALT) echoes, results (e.g., rms surface slopes and Fresnel reflectivity) from fitting analytic functions to those inversions, scattering function segments at oblique incidence angles derived from synthetic aperture radar (SAR) echoes, and estimates of surface emissivity derived from thermal microwave radiometry (RAD) measurements. The SCVDR is one of several inputs to the Global Vector Data Record (GVDR), a gridded summary of scattering results, also produced at Stanford. The SCVDR parallels the Altimetry and Radiometry Composite Data Record (ARCDR) produced at the Massachusetts Institute of Technology in its orbit-by-orbit organization. But the SCVDR differs from the ARCDR in that no a priori assumptions CATINFO.TXT... Page 126 are made regarding the form of the scattering function. The SCVDR was originally recorded on a set of 8 mm Unix 'tar' tapes. Data were blocked typically in groups of 100 orbits, but the coverage in a few cases was as large as several hundred orbits or as few as a dozen depending on mapping activity or mission scheduling. For transfer to CD-WO (the SCVDRCD) blocking was adjusted to match the capacity of the CD media. Parameters ========== The Magellan raw data set comprises three basic data types: echoes from the nadir-viewing altimeter (ALT), echoes from the oblique backscatter synthetic aperture radar (SAR) imaging system, and passive radiothermal emission measurements (RAD) made using the SAR high-gain antenna (HGA). The objective in compiling the SCVDR is to obtain an accurate estimate of the surface backscattering function (sometimes called the specific backscatter function or 'sigma-zero') for Venus from these three data types and to show its variation with incidence (polar) angle, azimuthal angle, and surface location. The Magellan data have been 'inverted' using techniques described by [TYLER1992]. If a surface is statistically homogeneous and scatters isotropically, the distribution of echo signal can be predicted using the radar equation on small surface elements, then sorting and accumulating the incremental power contributions by time-delay and Doppler frequency. Given a measured radar echo versus range and Doppler, the process may be inverted to yield the specific radar cross section as a function of incidence angle. In the SCVDR the Magellan empirical backscattering function has been obtained from ALT data at nadir to as much as 10 degrees from normal incidence in steps of 0.5 degrees. The empirical backscattering function at oblique angles (15 to 50 degrees from normal incidence) has been obtained over narrow ranges (1-4 degrees) from the SAR data. The emissivity, which in some models is the complement of the Fresnel reflectivity, has been obtained from the RAD measurements. Processing ========== ALT and SAR data have been processed at Stanford University using 'inversion' methods, whereby the radar equation is converted to a matrix-vector relationship and that is solved (using least-squares techniques) to obtain an 'empirical' scattering function for each radar echo [TYLER1992]. In the case of ALT data, stability of the solution requires considerable attention; in the case of SAR data, it is the variability of the surface scattering itself that leads to the most uncertainty. Stanford has also independently confirmed the results of the MIT processing of emissivity data but without developing separate algorithms. At Stanford ALT-EDR tapes were the input for calculation of DATASET.CAT... Page 127 near-nadir empirical backscattering functions. For oblique backscatter, C-BIDR tapes from the Magellan Project and F-BIDR files obtained via Internet from Washington University were the input products. Emissivity results were calculated from radar burst headers, which are included among both the ALT-EDR and C/F-BIDR files. Output was collected on an orbit-by-orbit basis into the SCVDR. Data ==== Each SCVDR includes data from several orbits. For each orbit, there are six files: (1) Orbit Header File (2) Altimetry Inversion File (ANF) (3) Inversion Fit File (NNF) (4) Sinusoidal Image File (SIF) (5) Oblique Image File (OIF) (6) Emissivity Data File (EDF) The Orbit Header File contains basic information about the Magellan orbit and summary data from the other five files. OHF information includes average Keplerian orbit elements, the number of entries in each of the other files, and starting and ending times for data in the other files. The Altimetry Inversion file contains the results of the altimetry echo inversion (sigma-zero versus incidence angle at spacings typically of 0.5 degree to a maximum of about 10 degrees from nadir). The ANF also includes uncertainties in sigma-zero, geometry for the ALT observations, parameters of the radar system used in computing the absolute backscatter, and echo timing estimates which could be converted to Venus radius values. The Inversion Fit File contains results from fitting up to five scattering laws to the experimentally derived near-nadir sigma-zero function (the ANF). The five laws include: Hagfors, exponential, gaussian, Rayleigh, and Muhleman. Free parameters (for example, the roughness parameter C and the Fresnel reflectivity R for the Hagfors law) are also reported, as is an estimate of the rms surface roughness corresponding to each fit. Residuals between the analytic function and the data indicate which function best matches the experimental results. The Sinusoidal Image File contains the results of fitting a quadratic function to the average SAR pixel values across a sinusoidal equal area image strip. The image strips are from either C-BIDR or F-BIDR files; the best fit quadratic represents the sigma-zero function over a few degrees of incidence angle for a surface area about 20 km across track and about 2 km along track. Geometrical data, uncertainties, and other information is also included in the SIF. The Oblique Image File contains the results of fitting a quadratic approximation to pixel values stored in the Magellan oblique sinusoidal equal area projection. The OIF and SIF are identical except for the projection of the input pixel data. The OIF contains data for north and south polar DATASET.CAT... Page 128 regions. The Emissivity Data File contains results of analysis of Magellan RAD data. Surface emissivities, uncertainties, geometrical data, and system parameter values are included. Ancillary Data ============== Inversion of the altimetry data requires use of matrices incorporating information about the geometry of the observations and the relationships of geometry to radar range, Doppler frequency offset, and incidence angle on the planet's surface. Matrices were computed at approximately one degree increments in spacecraft latitude for orbits on which viewing conditions were distinctly different. These matrices are included with the SCVDR data in the GEOMETRY directory on the CD-WO. Ancillary data for most processing at Stanford was obtained from the data tapes and files received from the Magellan Project. These included trajectory and pointing information for the spacecraft, clock conversion tables, spacecraft engineering data, and SAR processing parameters. For calibration of the radar instrument itself, Magellan Project reports (including some received from Hughes Aircraft Co. [BARRY1987; CUEVAS1989; SE011]) were used. Documentation on handling of data at the Jet Propulsion Laboratory was also used [BRILL&MEISL1990; SCIEDR; SDPS101]. Coordinate System ================= Most information about spacecraft positions and velocities is stored using J2000 inertial coordinates. Most information about surface locations is stored using Venus Body Fixed 1985 coordinates [LYONS1988]. Software ======== A special library and several example programs are provided in source code form for reading the SCVDR data files. One main program is provided for each file type (including the geometry files). These are provided to illustrate access to the data using the reader subroutine(s); the main programs themselves do nothing beyond returning diagnostic messages. Source code and include files are in the C language; a Unix makefile (for creating executables) and a Perl script (to list contents of SCVDR files) are also provided. Media/Format ============ The SCVDR will be delivered using compact disc write once (CD-WO) media. Formats will be based on standards for such products established by the Planetary Data System (PDS) [PDSSR1992]. " DATASET.CAT... Page 129 CONFIDENCE_LEVEL_NOTE = " Overview ======== The SCVDR is intended to be a systematic and comprehensive reduction of radar and radio data acquired by the Magellan Mission. It emphasizes extraction of electromagnetic properties of the Venus surface with minimal assumptions regarding the form of the backscatter function. Limitations implicit in the analysis approach and in the resulting data are summarized below. Review ====== The SCVDR has been reviewed internally by the Magellan Project prior to release to the planetary community. The review included compilation of the Global Vector Data Record (GVDR) at Stanford and independent confirmation of formats and values at M.I.T. Data Coverage and Quality ========================= Because the orbit of Magellan was elliptical during most of its mapping operations, the character of the signal varied considerably over an orbit as well as from place to place on the surface. Although the SCVDR quantifies much of the spatial variation, systematic limitations of both the instrument and the mission mean that some variability was missed or only partially captured. General Limitations ------------------- It is important to remember that, since the SAR and ALT antennas were aimed at different parts of the planet during each orbit, building up a collection of composite scattering data for any single surface region requires that results from several orbits be integrated. In the case of data from polar regions, where only the SAR was able to probe, there will be no ALT data. When scheduling or other factors interrupted the systematic collection of data, there may be ALT data for some regions but no comparable SAR or radiometry data (or vice versa). Outages played an important role in determining coverage for all Cycles. For example, although a goal of Cycle 3 radar mapping was radar stereo, early orbits were used to collect data at nominal incidence angles that had been missed during Cycle 1 because of thermal problems with the spacecraft. A transmitter failure during Cycle 3 caused a further loss of data. It is not within the scope of this description to provide detailed information on data coverage. Leading Edge: Identification of the echo leading edge is critical for both topographic analysis and extraction of the near-nadir scattering function from ALT data. For topography, a timing error translates directly into an DATASET.CAT... Page 130 error in planetary radius. For calculation of the scattering function, both the inferred echo dispersion and the inferred echo amplitude will be in error if the initial rise of the echo is improperly identified. This limitation applies most commonly when the spacecraft ALT antenna was aimed away from nadir and the surface was rough (e.g., during Cycle 1 over Aphrodite Terra). Inversion Stability: Although the ALT inversions require no assumptions about the form of the backscatter function, inversion processes are unstable in the presence of noise. Second differences were constrained during ALT inversions to improve stability. The quantitative constraint was varied from periapsis to the poles based on whether the 'noise' was radar echo speckle or speckle plus thermal system noise in the receiver. Instabilities affect primarily the inversion results at the largest incidence angles. Noise Baseline: During ALT inversion, an estimate of 'thermal' noise was derived from the data. At low spacecraft altitudes noise was primarily radar clutter (for example, aliased signal from frequencies outside the nominal Doppler window). At high spacecraft altitudes, both range aliasing and real system thermal noise contributed. The erroneous inclusion of high-angle scattered signal in the 'noise' estimate leads to the following consequences: (1) the derived scattering function amplitude will be underestimated (inferred reflectivity will be too small); (2) the echo decay rate with incidence angle will be overestimated (inferred rms surface slope will be too small); (3) uncertainty in the derived scattering function will be too small (especially at the largest angles). Orbit Eccentricity: Periapsis throughout the radar mapping mission was near 10 degrees N latitude at altitudes of approximately 300 km. The altitude near the poles, on the other hand, was on the order of 3000 km. For all data types this means lower confidence in results obtained at the poles than near the equator. Dynamic Antenna Pointing: The spacecraft attitude varied during each orbit to compensate partially for the changing SAR range to the surface and to provide scattering at higher incidence angles when the echo signal was expected to be strongest. The SAR antenna was pointed at about 45 degrees from nadir near periapsis; this was reduced to about 15 degrees at the poles. The ALT antenna, at a constant 25 degree offset from the SAR antenna, followed in tandem but at angles which were not optimized for obtaining the best altimetry echo. Footprints: A nominal nadir footprint can be assigned to altimetry results, but this footprint is biased near periapsis because the ALT antenna is rotated about 20 degrees from nadir (during Cycle 1). Over polar regions in Cycle 1, the ALT antenna is rotated about 10 degrees DATASET.CAT... Page 131 to the opposite side of nadir. A more important consideration in polar regions is that the area illuminated by the ALT antenna is approximately 100 times as large as near periapsis because of the higher spacecraft altitude. The region contributing to echoes in polar regions -- and therefore the region over which estimates of Fresnel reflectivity and rms surface tilts apply -- is much larger than at periapsis. Cycle 1 Mapping --------------- During Mapping Cycle 1 almost half the orbits provided SAR images of the north pole; because of the orbit inclination, ALT data never extended beyond about 85N latitude in the north and 85S in the south. No SAR images of the south pole were acquired during Mapping Cycle 1 because the SAR antenna was always pointed to the left of the ground track; Cycle 1 SAR image strips near the south pole were at latitudes equatorward of 85S. Beginning at approximately orbit 600 and extending until nearly orbit 1100, onboard recording of radar data slowly degraded. Most of these data were subsequently reprocessed, with some improvement in data quality. Where available, the reprocessed data have been included in the SCVDR. Cycle 2 Mapping --------------- During much of Mapping Cycle 2, the spacecraft was flown 'backwards' so as to provide SAR images of the same terrain but with 'opposite side' illumination. This adjustment also meant that the SAR could image near the Venus south pole (but not near the north pole). The ALT data continued to be limited to latitudes equatorward of 85N and 85S. SCVDR processing of image data within about two degrees of the south pole suffers from errors. This apparently resulted from reprojection of the oblique sinusoidal pixels but the precise cause of the problem was never isolated and corrected. This problem potentially affects all south pole OIF data, including any obtained in Cycle 3 as well as the larger volume from Cycle 2. Cycle 3 Mapping --------------- During Mapping Cycle 3 the emphasis was on obtaining SAR data at the same viewing azimuth as in Cycle 1 but at different incidence angles (for radar stereo). In fact, most data were acquired at an incidence angle of about 25 degrees, which meant that the ALT antenna was usually aimed directly at nadir instead of drifting from side to side, as had been the case in Cycles 1 and 2. These Cycle 3 data, therefore, may be among the best from the altimeter. Dynamic range in SAR data was larger than in Cycles 1 and 2 because the incidence angle was fixed rather than varying to compensate for the changing spacecraft altitude. DATASET.CAT... Page 132 Other Comments ============== Although information on radar echo timing is included in the ANF, a thorough analysis for topography was not attempted in the SCVDR. Comparison of the preliminary SCVDR results with results in the ARCDR showed consistency in the altitude estimates. Systematic errors were more carefully addressed in the ARCDR. ARCDR topography was carried forward to the GVDR. Likewise, the EDF results in the SCVDR are consistent with emissivity data in the ARCDR. The ARCDR emissivity results were carried forward to the GVDR." END_OBJECT = DATA_SET_INFORMATION OBJECT = DATA_SET_TARGET TARGET_NAME = VENUS END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = MGN INSTRUMENT_ID = RDRS END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "BARRY1987" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "BRILL&MEISL1990" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "CUEVAS1989" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "LYONS1988" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "PDSSR1992" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "SCIEDR" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "SDPS101" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "SE011" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "TYLER1992" END_OBJECT = DATA_SET_REFERENCE_INFORMATION DATASET.CAT... Page 133 END_OBJECT = DATA_SET END C.4. DOCINFO.TXT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM SPACECRAFT_NAME = MAGELLAN TARGET_NAME = VENUS OBJECT = TEXT PUBLICATION_DATE = 1995-01-01 NOTE = "MAGELLAN SCVDR ARCHIVE CD-WO" END_OBJECT = TEXT END DESCRIPTION OF DOCUMENTATION FILES ON THIS VOLUME This file describes the files present in the [DOCUMENT] directory on this volume. The files are: SCVDR.ASC - Software Interface Specification for the Magellan Surface Characteristics Vector Data Record (SCVDR) products, from which the SCVDRCD disks are made. Formatted for display or printing at 66 lines per page with up to 78 constant-width characters per line. SCVDR.LBL - PDS detached label file describing SCVDR.ASC and SCVDR.PS. SCVDR.PS - Software Interface Specification for the Magellan Surface Characteristics Vector Data Record (SCVDR) products, from which the SCVDRCD disks are made. Formatted in Adobe PostScript. SCVDRCD.ASC - Software Interface Specification for the Magellan Surface Characteristics Vector Data Record on Compact Disk Read-Only Memory (SCVDRCD) Product. Formatted for display or printing at 66 lines per page with up to 78 constant-width characters per line. SCVDRCD.LBL - PDS detached label file describing SCVDRCD.ASC and SCVDRCD.PS. SCVDRCD.PS - Software Interface Specification for the Magellan Surface Characteristics Vector Data Record on Compact Disk Read-Only Memory (SCVDRCD) Product. Formatted in Adobe PostScript. DATASET.CAT... Page 134 C.5. GEOMINFO.TXT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM SPACECRAFT_NAME = MAGELLAN TARGET_NAME = VENUS OBJECT = TEXT PUBLICATION_DATE = 1995-01-01 NOTE = "MAGELLAN SCVDR GEOMETRY FILES" END_OBJECT = TEXT END DESCRIPTION OF GEOMETRY FILES IN THIS DIRECTORY The files in this directory contain the inversion matrices used to generate the ANF and NFF files in the data directories on this volume. Each GMF file is accompanied by a detached PDS label file with the same name and 'LBL' extension. Refer to file SCVDRCD.TXT in the DOCUMENT directory for further details. C.6. INDEX.TAB Example 0376,01,"ANF00376.1","S0376_01","SCVDR.00376-00399;1","GMF00376.1","MG_2101" 0376,01,"EDF00376.1","S0376_01","SCVDR.00376-00399;1"," ","MG_2101" 0376,01,"GMF00376.1","GEOMETRY","SCVDR.00376-00399;1"," ","MG_2101" 0376,01,"NFF00376.1","S0376_01","SCVDR.00376-00399;1"," ","MG_2101" 0376,01,"OHF00376.1","S0376_01","SCVDR.00376-00399;1"," ","MG_2101" 0376,01,"OIF00376.1","S0376_01","SCVDR.00376-00399;1"," ","MG_2101" 0376,01,"SIF00376.1","S0376_01","SCVDR.00376-00399;1"," ","MG_2101" 0377,01,"ANF00377.1","S0377_01","SCVDR.00376-00399;1","GMF00376.1","MG_2101" 0377,01,"EDF00377.1","S0377_01","SCVDR.00376-00399;1"," ","MG_2101" 0377,01,"NFF00377.1","S0377_01","SCVDR.00376-00399;1"," ","MG_2101" 0377,01,"OHF00377.1","S0377_01","SCVDR.00376-00399;1"," ","MG_2101" 0377,01,"OIF00377.1","S0377_01","SCVDR.00376-00399;1"," ","MG_2101" 0377,01,"SIF00377.1","S0377_01","SCVDR.00376-00399;1"," ","MG_2101" C.7. INDXINFO.TXT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM SPACECRAFT_NAME = MAGELLAN TARGET_NAME = VENUS OBJECT = TEXT PUBLICATION_DATE = 1995-01-01 NOTE = "MAGELLAN SCVDR ARCHIVE CD-WO" END_OBJECT = TEXT END DESCRIPTION OF INDEX FILES ON THIS VOLUME This file describes the files present in the [INDEX] directory on this volume. The files are: INDEX.LBL - PDS label for the volume index (INDEX.TAB). It GEOMINFO.TXT... Page 135 identifies the volume index and describes the structure (columns) of the index table. INDEX.TAB - Volume index in tabular format. CUMINDEX.LBL - PDS label for the cumulative volume index (CUMINDEX.TAB). CUMINDEX.TAB - Cumulative volume index in tabular format. C.8. INST.CAT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 OBJECT = INSTRUMENT INSTRUMENT_HOST_ID = "MGN" INSTRUMENT_ID = "RDRS" OBJECT = INSTRUMENT_INFORMATION INSTRUMENT_NAME = "RADAR SYSTEM" INSTRUMENT_TYPE = "RADAR" INSTRUMENT_DESC = " Instrument Specifications ========================= The radar was manufactured by Hughes Aircraft Company and the 'build date' is taken to be 1989-01-01. The radar dimensions were 0.304 by 1.35 by 0.902 (height by length by width in meters) and the mass was 126.1 kg. Instrument Id : RDRS Instrument Host Id : MGN Pi Pds User Id : GPETTENGILL Instrument Name : RADAR SYSTEM Instrument Type : RADAR Build Date : 1989-01-01 Instrument Mass : 126.100000 Instrument Length : 1.350000 Instrument Width : 0.902000 Instrument Height : 0.304000 Instrument Manufacturer Name : HUGHES AIRCRAFT For more information on the radar system see the papers by [JOHNSON1990] and [SAUNDERSETAL1990]. Instrument Overview =================== The Magellan radar system included a 3.7 m diameter high gain antenna (HGA) for SAR and radiometry and a smaller fan-beam antenna (ALTA) for altimetry. The system operated at 12.6 cm wavelength. Common electronics were used in SAR, altimetry, and radiometry modes. The SAR operated in a burst mode; altimetry and radiometry observations were interleaved with the SAR bursts. INDXINFO.TXT... Page 136 Between SAR bursts (typically several times a second) groups of altimeter pulses were transmitted from a dedicated fan-beam altimeter antenna directed toward the spacecraft's nadir. The altimeter pulses were identical in waveform and bandwidth to the SAR pulses, resulting in a range accuracy of better than 15 m. The pulse-repetition rate and burst duration differed between the two modes. Radiometry data were obtained by spending a portion of the time between SAR bursts and after altimeter operation in a passive (receive-only) mode, with the HGA antenna capturing the microwave thermal emission from the planet. Noise power within the 10-MHz receiver bandwidth was detected and accumulated for 50 ms. To reduce the sensitivity to receiver gain changes in this mode, the receiver was connected on alternate bursts first to a comparison dummy load at a known physical temperature and then to the HGA. The short-term temperature resolution was about 2 K; the long-term absolute accuracy after calibration was about 20 K. Science Objectives ================== See MISSION_OBJECTIVES_SUMMARY under MISSION. Operational Considerations ========================== The Magellan radar system was used to acquire radar back-scatter (SAR) images, altimetry, and radiometry when the spacecraft was close to the planet. Nominal operation extended from about 20 minutes before periapsis until about 20 minutes after periapsis. In the SAR mode output from the radar receiver was sampled, blocks of samples were quantized using an adaptive procedure, and the results were stored on tape. In the altimetry mode samples were recorded directly, without quantization. Radiometry measurements were stored in the radar header records. During most of the remainder of each orbit, the HGA was pointed toward Earth and the contents of the tape recorder were transmitted to a station of the DSN at approximately 270 kilobits/second. SAR, altimetry, and radiometry data were then processed using ground software into images, altimetry profiles, estimates of backscatter coefficient, emissivity, and other quantities. Calibration Description ======================= The radar was calibrated before flight using an active electronic target simulator [CUEVAS1989]. Platform Mounting Descriptions ============================== The spacecraft +Z axis vector was in the nominal direction of the HGA boresight. The +X axis vector was parallel to the nominal rotation axis of the solar panels. The +Y axis vector formed a right-handed coordinate system and was in the nominal direction of the star scanner boresight. The spacecraft velocity vector was in approximately the -Y direction when the INST.CAT... Page 137 spacecraft was oriented for left-looking SAR operation. The nominal HGA polarization was linear in the y-direction. Cone Offset Angle : 0.00 Cross Cone Offset Angle : 0.00 Twist Offset Angle : 0.00 The altimetry antenna boresight was in the x-z plane 25 degrees from the +Z direction and 65 degrees from the +X direction. The altimetry antenna was aimed approximately toward nadir during nominal radar operation. The altimetry antenna polarization was linear in the y-direction. The medium gain antenna boresight was 70 degrees from the +Z direction and 20 degrees from the -Y direction. The low gain antenna was mounted on the back of the HGA feed; it's boresight was in the +Z direction and it had a hemispherical radiation pattern. Principal Investigator ====================== The Principal Investigator for the radar instrument was Gordon H. Pettengill. Instrument Section / Operating Mode Descriptions ================================================ The Magellan radar system consisted of the following sections, each of which operated in the following modes: Section Mode ------------------------------------------- SAR Synthetic Aperture Radar (SAR) ALT Altimetry RAD Radiometry (1) SAR Characteristics ----------------------- In the Synthetic Aperture Radar mode, the radar transmitted bursts of phase-modulated pulses through its high gain antenna. Echo signals were captured by the antenna, sampled at the receiver output, and stored on tape after being quantized to reduce data volume. Pulse repetition rate and incidence angle were chosen to meet a minimum signal-to-noise ratio requirement (8 dB) for image pixels after ground processing. Multiple looks were used in processing to reduce speckle noise. Incidence angles varied from about 13 degrees at the pole to about 44 degrees at periapsis during normal mapping operations (e.g., Cycle 1); but other 'look angle profiles' were used during the mission. Peak transmit power : 350 watts Transmitted pulse length : 26.5 microsecs Pulse repetition frequency : 4400-5800 per sec Time bandwidth product : 60 Inverse baud width : 2.26 MHz Data quantization (I and Q) : 2 bits each Recorded data rate : 750 kilobits/sec INST.CAT... Page 138 Polarization (nominal) : linear horizontal HGA half-power full beam width : 2.2 deg (azimuth) : 2.5 deg (elev) one-way gain (from SAR RF port) : 35.7 dBi System temperature (viewing Venus) : 1250 K Surface resolution (range) : 120-360 m (along track) : 120-150 m Number of looks : 4 or more Swath width : 25 km (approx) Antenna look angle : 13-47 deg Incidence angle on surface : 18-50 deg Data Path Type : RECORDED DATA PLAYBACK Instrument Power Consumption : UNK (2) ALT Characteristics ----------------------- After SAR bursts (typically several times a second) groups of altimeter pulses were transmitted from a dedicated fan beam altimeter antenna (ALTA) directed toward the spacecraft's nadir. Output from the radar receiver was sampled, and the samples were stored on tape for transmission to Earth. During nominal left-looking SAR operation the ALTA pointed approximately 20 deg to the left of the spacecraft ground track at periapsis and about 10 deg to the right of the ground track near the north and south pole. Data quantization (I and Q) : 4 bits each Recorded data rate : 35 kbs Polarization : linear ALTA half-power full beamwidth (along track): 11 deg (cross track): 31 deg one-way gain referenced to ALT RF port : 18.9 dBi ALTA offset from HGA : 25 deg Burst interval : 0.5-1.0 sec duration : 1.0 millisec Dynamic range : 30 dB (or more) Data Path Type : RECORDED DATA PLAYBACK Instrument Power Consumption : UNK (3) RAD Characteristics ----------------------- Radiometry measurements were made by the radar receiver and HGA in a receive-only mode that was activated after the altimetry mode to record the level of microwave radiothermal emission from the planet. Noise power within the 10-MHz receiver bandwidth was detected and accumulated for 50 ms. To reduce the sensitivity to receiver gain changes in this mode, the receiver was connected on alternate bursts first to a comparison dummy load at a known physical temperature and then to the HGA. The short-term temperature resolution was about 2 K; the long-term absolute accuracy after calibration was about 20 K. At several times during the mission, radiometry INST.CAT... Page 139 measurements were carried out using known cosmic radio sources. Receiver Bandwidth : 10 MHz Integration Time : 50 millisecs Polarization (nominal) : linear horizontal Data Quantization : 12 bits Data Rate : 10-48 bits/sec HGA half-power full beam width : 2.2 deg System temperature (viewing Venus) : 1250 K Antenna look angle : 13-47 deg Incidence angle on surface : 18-50 deg Surface resolution (along track) : 15-120 km (cross track) : 20-125 km Data Path Type : RECORDED DATA PLAYBACK Instrument Power Consumption : UNK " END_OBJECT = INSTRUMENT_INFORMATION OBJECT = INSTRUMENT_REFERENCE_INFO REFERENCE_KEY_ID = "CUEVAS1989" END_OBJECT = INSTRUMENT_REFERENCE_INFO OBJECT = INSTRUMENT_REFERENCE_INFO REFERENCE_KEY_ID = "JOHNSON1990" END_OBJECT = INSTRUMENT_REFERENCE_INFO OBJECT = INSTRUMENT_REFERENCE_INFO REFERENCE_KEY_ID = "SAUNDERSETAL1990" END_OBJECT = INSTRUMENT_REFERENCE_INFO END_OBJECT = INSTRUMENT END C.9. INSTHOST.CAT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 OBJECT = INSTRUMENT_HOST INSTRUMENT_HOST_ID = "MGN" OBJECT = INSTRUMENT_HOST_INFORMATION INSTRUMENT_HOST_NAME = "MAGELLAN" INSTRUMENT_HOST_TYPE = "SPACECRAFT" INSTRUMENT_HOST_DESC = " Spacecraft Overview =================== The Magellan spacecraft was built by the Martin Marietta Corporation. The spacecraft structure included four major sections: High-Gain Antenna (HGA), Forward Equipment Module (FEM), Spacecraft Bus (including the solar array), and the Orbit Insertion Stage. Spacecraft subsystems included those for INST.CAT... Page 140 thermal control, power, attitude control, propulsion, command data and data storage, and telecommunications. Design of the Magellan spacecraft was driven by the need for a low-cost, high-performance vehicle. Protoflight units that had been built for preflight tests or were spares from the Voyager spacecraft were available from storage at no cost. These included the 3.7 meter diameter high-gain antenna (HGA), the spacecraft bus, propulsion system components, thermal control louvers, and much of the radio subsystem. The stockpile of flight spares for the Galileo spacecraft provided Magellan's command and data system, tape recorders, attitude control processor, power subsystem and propulsion components. Further elements were drawn from other projects and from NASA standard designs. Only about 30% (by mass) of the Magellan spacecraft -- primarily the radar electronics and the solar panels -- was especially designed for the mission. The high-gain antenna (HGA) was used as the antenna for the synthetic aperture radar (SAR) and as the primary antenna for the telecommunications system. The HGA boresight was defined to be the +Z axis for the spacecraft-fixed coordinate system. The spacecraft bus was a ten sided structure containing the star scanner, medium-gain antenna (MGA), rocket engine modules (REMs), command data and data storage (CDDS) subsystem, attitude control monopropellant tank, and a nitrogen tank for providing propellant pressurization. The solar panel array was attached to the bus; its rotation axis defined the +X axis for the spacecraft-fixed coordinate system. The +Y axis of the coordinate system was in the nominal direction of the star scanner boresight, forming a right-hand coordinate system. The radar electronics, the reaction wheels, and various other spacecraft subsystem components were contained within the Forward Equipment Module, located between the bus and HGA. The orbit insertion stage contained a STAR-48 solid rocket motor (SRM) that was used to provide the impulse required to perform the Venus Orbit Insertion (VOI) maneuver. Thermal control of the spacecraft was accomplished by a combination of louvers, thermal blankets, passive coatings, and heat dissipating elements. The nominal operating temperature for the spacecraft components was between -5 and +40 degrees Celsius. The thermal control subsystem maintained these components at the appropriate temperatures for all orientations of the spacecraft orbit and sun-line and for all spacecraft operating modes. Electrical power was supplied by two large solar panels with a total area of 12.6 square meters. This array was capable of producing a minimum power of 1029 W at the end of the nominal mission; it could rotate about its axis to allow tracking of the Sun despite the changing Earth-Sun-spacecraft geometry during the mission. A dedicated sun sensor optimized power production. Bus voltage regulation was controlled by the power control unit (PCU) with a shunt regulator for diverting excess power from the solar arrays to maintain power as raw power (28-35 v), regulated power at 28 vDC +/-0.56 vDC, and as AC at 2.4 kHz through an inverter. Two 30 amp-hour, 26-cell nickel cadmium batteries provided power during INSTHOST.CAT... Page 141 times of solar occultation and allowed normal spacecraft operations independent of real-time solar illumination. These batteries were sized to allow a degraded mission in the event that one of them failed. The attitude of the Magellan spacecraft was controlled through the use of reaction wheels, with monopropellant rocket motors being used to desaturate the reaction wheels periodically. During both the interplanetary cruise and the orbital portions of the mission, attitude reference was provided by an inertial reference unit (IRU), updated each orbit using celestial references. During the mapping part of each orbit, the spacecraft was initially oriented with the HGA pointing down toward Venus, with the exact attitude being a function of the spacecraft altitude and the SAR mapping objectives. During the downlink transmission part of the orbit, the spacecraft was oriented with the HGA slightly off the Earth-line. The low gain antenna (LGA) was mounted coaxially with the HGA and did not require pointing since it had an omnidirectional beam pattern. The altimeter horn (ALTA) was mounted so that a portion of the fan-shaped beam nominally pointed in the nadir direction during the mapping part of an orbit. The Magellan propulsion subsystem consisted of two parts. The first, a Star 48 SRM, provided the impulse for VOI. Following that maneuver, the empty casing and parts of its support structure were ejected from the spacecraft. The second part consisted of monopropellant hydrazine thrusters that were used for trajectory correction maneuvers (TCMs) during inter- planetary cruise, thrust vector control (TVC) during VOI, orbit trim maneuvers during the mapping mission, and attitude control when the reaction wheels were being desaturated. The rocket motors were clustered in modules located on the end of outrigger booms in order to increase their moment arms and thus decrease attitude control propellant requirements. Twelve 0.9-N (Newton) and four 22-N rocket motors were used for attitude control, with thrust being provided by eight 445-N rocket motors or by the 0.9-N motors for small TCMs. All engines pointed in the -Z direction, with the exception of the roll motors. The 0.9-N motors were used for tip-off control following separation of the inertial upper stage (IUS), reaction wheel desaturation, roll control for all times other than VOI, to back up any failed reaction wheels, and for small TCMs or orbit trim maneuvers (OTMs). The 22-N motors were used for roll control during VOI. The 445-N motors were used for controlling the spacecraft rotational axis during VOI, and to provide impulses during all propulsive maneuvers. The monopropellant motors also provided the impulses needed to trim the VOI maneuver. The command, data and data storage (CDDS) system received uplink commands via the radio frequency subsystem (RFS) and controlled the spacecraft in response to those commands. It also controlled the acquisition and storage of scientific data and sending that data, along with supplemental engineering data, to the RFS for downlink transmission to Earth. The commands were sent to the spacecraft as time-event pairs for storage and later execution, and also in the form of blocks which the CDDS later INSTHOST.CAT... Page 142 expanded into spacecraft executable commands. In the Venus orbit phase, commands for up to three days of radar operation were stored. There was also a provision for receiving and executing discrete commands sent from the ground. SAR data were stored on two multi-track digital tape records (DTRs) for later playback over the high-rate X-band link; there was no provision for real-time transmission of the SAR data. Data storage capacity of the two DTRs was approximately 1.8 billion bits. Engineering data were normally transmitted to Earth over a real-time S-band link. During those times when a real-time link was not possible, the engineering data were recorded on a DTR and played back via the X-band high-rate link with the SAR data. The recorded data stream was alternately switched between the two DTRs so that the data would not be lost during the DTR track change. The Magellan telecommunications subsystem contained all the hardware necessary to maintain communications between Earth and the spacecraft. The subsystem contained the radio frequency subsystem, the LGA, MGA, and HGA. The RFS performed the functions of carrier transponding, command detection and decoding, and telemetry modulation. The spacecraft was capable of simultaneous X-band and S-band uplink and downlink operations. The S-band operated at a transmitter power of 5 W, while the X-band operated at a power of 22 W. Uplink data rates were 31.25 and 62.5 bps (bits per second) with downlink data rates of 40 bps (emergency only), 1200 bps (real-time engineering rate), 115.2 kbps (kilobits per second) (radar downlink backup), and 268.8 kbps (nominal). For more information on the Magellan spacecraft see the papers by [SAUNDERSETAL1990] and [SAUNDERSETAL1992]. " END_OBJECT = INSTRUMENT_HOST_INFORMATION OBJECT = INSTRUMENT_HOST_REFERENCE_INFO REFERENCE_KEY_ID = "SAUNDERSETAL1990" END_OBJECT = INSTRUMENT_HOST_REFERENCE_INFO OBJECT = INSTRUMENT_HOST_REFERENCE_INFO REFERENCE_KEY_ID = "SAUNDERSETAL1992" END_OBJECT = INSTRUMENT_HOST_REFERENCE_INFO END_OBJECT = INSTRUMENT_HOST END C.10. LABINFO.TXT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM SPACECRAFT_NAME = MAGELLAN TARGET_NAME = VENUS OBJECT = TEXT PUBLICATION_DATE = 1995-01-01 NOTE = "MAGELLAN SCVDR FORMAT FILES" END_OBJECT = TEXT INSTHOST.CAT... Page 143 END DESCRIPTION OF PDS LABEL FILES ON THIS VOLUME This file describes the files present in the [LABEL] directory on this volume. The files are: SCVDRANF.FMT - PDS detached object format file describing the structure of the binary data records in the ANFs (Altimeter Inversion Files) in the data directories of this volume. SCVDRANH.FMT - PDS detached object format file describing the structure of the single binary header record in the ANFs (Altimeter Inversion Files) in the data directories of this volume. SCVDREDF.FMT - PDS detached object format file describing the structure of the binary data records in the EDFs (Emissivity Data Files) in the data directories of this volume. SCVDREDH.FMT - PDS detached object format file describing the structure of the single binary header record in the EDFs (Emissivity Data Files) in the data directories of this volume. SCVDRGMF.FMT - PDS detached object format file describing the structure of the binary data records in the GMFs (Geometry Matrix Files) in the GEOMETRY directory of this volume. SCVDRGMH.FMT - PDS detached object format file describing the structure of the single binary header record in the GMFs (Geometry Matrix Files) in the GEOMETRY directory of this volume. SCVDRIMF.FMT - PDS detached object format file describing the structure of the binary data records in the SIFs (Sinusoidal Image Files) and OIFs (Oblique Sinusoidal Image Files) in the data directories of this volume. SCVDRIMH.FMT - PDS detached object format file describing the structure of the single binary header record in the SIFs (Sinusoidal Image Files) and OIFs (Oblique Sinusoidal Image Files) in the data directories of this volume. SCVDRNFF.FMT - PDS detached object format file describing the structure of the binary data records in the NFFs (Altimeter Inversion Fit Files) in the data directories of this volume. SCVDRNFH.FMT - PDS detached object format file describing the structure of the single binary header record in the NFFs (Altimeter Inversion Fit Files) in the data directories of this volume. SCVDROHF.FMT - PDS detached object format file describing the LABINFO.TXT... Page 144 structure of the single binary data record in the OHFs (Orbit Header Files) in the data directories of this volume. The remaining PDS label files on this volume are located in the several data directories. Their names end with 'LBL' and they describe the corresponding data files. The keywords in all PDS label files are described in "Planetary Science Data Dictionary", JPL D-7116, Rev. C, 20 November 1992. C.11. MISSION.CAT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 OBJECT = MISSION MISSION_NAME = "MAGELLAN" OBJECT = MISSION_INFORMATION MISSION_START_DATE = 1989-05-04 MISSION_STOP_DATE = 1994-10-12 MISSION_ALIAS_NAME = "VENUS RADAR MAPPER (VRM)" MISSION_DESC = " Mission Overview ================ The Magellan spacecraft was launched from the Kennedy Space Center on 4 May 1989. The spacecraft was deployed from the Shuttle cargo bay after the Shuttle achieved parking orbit. Magellan, using an inertial upper stage rocket, was then placed into a Type IV transfer orbit to Venus where it carried out radar mapping and gravity studies starting in August 1990. The Mission has been described in many papers including two special issues of the Journal of Geophysical Research [VRMPP1983; SAUNDERSETAL1990; JGRMGN1992]. The radar system is also described in [JOHNSON1990]. Magellan was powered by single degree of freedom, sun-tracking, solar panels. The spacecraft was 3-axis stabilized by reaction wheels using gyros and a star sensor for attitude reference. The spacecraft carried a solid rocket motor for Venus orbit insertion. A small hydrazine system was used for trajectory corrections and certain attitude control functions. Earth communication with the Deep Space Network (DSN) was by means of S- and X-band channels. The high-gain antenna also functioned as the SAR mapping antenna during orbital operations. The interplanetary cruise phase lasted until 10 August 1990. During the cruise phase there were small trajectory correction maneuvers to ensure proper approach geometry. Using the solid rocket motor, the spacecraft was placed into an elliptical orbit around the planet, with a periapsis latitude of approximately 10 degrees north, a periapsis altitude of 295 km, a period of 3.263 hours, and an apoapsis altitude of approximately 7762 km. LABINFO.TXT... Page 145 After orbit insertion, the radar system acquired test data. Then, unexpectedly, the signal from the spacecraft was lost twice. Following an intense recovery process, commands were sent to avoid further communication interruptions, and the spacecraft resumed mapping operations on 15 September 1990. Each mapping cycle lasted 243 days, which was the time required for Venus to make one rotation under the spacecraft orbit. The first mapping cycle ended on 15 May 1991. Typical activities during a single mapping pass on Cycle 1 were as follows. As the spacecraft neared periapsis, it was oriented so the high-gain antenna pointed slightly to the side of the ground track. At a true anomaly of -59 degrees, the radar was commanded on. The radar continued to take data to a true anomaly of 80 degrees and then the radar was commanded off. On the next pass the swath started at -80 degrees and went to 59 degrees. Alternating north and south swaths were repeated throughout Cycle 1. The range of latitudes covered by the synthetic aperture radar (SAR) during Cycle 1 was 67 degrees S to 90 degrees N. The range of SAR incidence angles was from just under 20 to just over 40 degrees. The SAR data were taken at a data rate of 750 kilobits/second and were stored in the spacecraft tape recorder. Altimeter and radiometer data were also taken when SAR data were acquired. The altimeter data were taken using a small fan beam antenna at a data rate of 30 kb/s. As the spacecraft moved away from the planet toward apoapsis, the spacecraft reoriented the high-gain antenna towards Earth and the stored radar data were transmitted to DSN stations. This data taking- and transmitting-cycle was repeated for every orbit. By 15 May 1991, the planet had been completely mapped except for the area near the South Pole and a few regions which had been missed because of temporary equipment failures. Cycle 2 observations focused on filling the gaps in Cycle 1 coverage (including the south pole area), acquiring SAR data at a constant incidence angle (25 degrees), and conducting a suite of ad hoc experiments, including high resolution imaging and radar stereo. To observe the south pole the spacecraft was rotated 180 degrees about its nadir-pointing axis so as to conduct right-looking SAR observations. Gaps in the Cycle 1 coverage were filled by rotating the spacecraft back to its initial left-looking direction. The orbit plane was adjusted slightly at the beginning of Cycle 2 so that altimetry tracks would be offset by about 10 km at the equator, bisecting the orbit-to-orbit offset of altimetry tracks in Cycle 1. The spacecraft was rotated 90 deg about the HGA boresight on orbits 3716-3719 to obtain SAR and radiometry data with VV polarization. Radio occultation measurements were made on orbits 3212-3214. The principal objective of Cycle 3 was to perform radar stereo mapping of the Venusian surface. About 30 percent of the Cycle 1 coverage was remapped in this cycle with a different, left-looking incidence angle on the surface. Gravity data were collected over Artemis Chasma. In addition, high resolution altimetry data were collected by pointing the high gain antenna straight down during orbits 4919 to 4921. Transmission of acquired radar data to Earth became nearly impossible after spacecraft equipment failures late in Cycle 3, and the radar was MISSION.CAT... Page 146 not used for science purposes after that. Cycle 4 was used for full (360 degree) longitudinal collection of gravity data because of favorable planetary and spacecraft geometry. The cycle was extended by about ten days to compensate for passage of the radio ray through the Venus atmosphere during the first ten days. To improve sensitivity to gravity features, orbit periapsis was lowered on orbit 5752. Radio occultation measurements were made on orbits 6369, 6370, 6471, and 6472. The aerobraking phase of the mission was designed to change the Magellan orbit from eccentric to nearly circular. This was accomplished by dropping periapsis to less than 150 km above the surface and using atmospheric drag to reduce the energy in the orbit. Aerobraking ended on 3 August 1993, and periapsis was boosted above the atmosphere leaving the spacecraft in an orbit that was 540 km above the surface at apoapsis and 197 km above the surface at periapsis. The orbit period was 94 minutes. The spacecraft remained on its medium-gain antenna in this orbit until Cycle 5 began officially on 16 August 1993. During Cycles 5 and 6 the orbit was low and approximately circular. The emphasis was on collecting high-resolution gravity data. Two bistatic surface scattering experiments were conducted, one on 6 October (orbits 9331, 9335, and 9336) and the second on 9 November (orbits 9846-9848). Mission Phases ============== Mission phases were defined for significant spacecraft activity periods. During orbital operations a 'cycle' was approximately the time required for Venus to rotate once under the spacecraft (about 243 days). But there were orbit adjustments and other activities that made some mapping cycles not strictly contiguous and slightly longer or shorter than the rotation period. PRELAUNCH --------- The prelaunch phase extended from delivery of the spacecraft to Kennedy Space Center until the start of the launch countdown. Spacecraft Id : MGN Target Name : VENUS Mission Phase Start Time : 1988-09-01 Mission Phase Stop Time : 1989-05-04 Spacecraft Operations Type : ORBITER LAUNCH ------ The launch phase extended from the start of launch countdown until completion of the injection into the Earth-Venus trajectory. Spacecraft Id : MGN Target Name : VENUS MISSION.CAT... Page 147 Mission Phase Start Time : 1989-05-04 Mission Phase Stop Time : 1989-05-04 Spacecraft Operations Type : ORBITER CRUISE ------ The cruise phase extended from injection into the Earth-Venus trajectory until 10 days before Venus orbit insertion. Spacecraft Id : MGN Target Name : VENUS Mission Phase Start Time : 1989-05-04 Mission Phase Stop Time : 1990-08-01 Spacecraft Operations Type : ORBITER ORBIT INSERTION --------------- The Venus orbit insertion phase extended from 10 days before Venus orbit insertion until burnout of the solid rocket injection motor. Spacecraft Id : MGN Target Name : VENUS Mission Phase Start Time : 1990-08-01 Mission Phase Stop Time : 1990-08-10 Spacecraft Operations Type : ORBITER ORBIT CHECKOUT -------------- The orbit trim and checkout phase extended from burnout of the solid rocket injection motor until the beginning of radar mapping. Spacecraft Id : MGN Target Name : VENUS Mission Phase Start Time : 1990-08-10 Mission Phase Stop Time : 1990-09-15 Spacecraft Operations Type : ORBITER MAPPING CYCLE 1 --------------- The first mapping cycle extended from completion of the orbit trim and checkout phase until completion of one cycle of radar mapping (approximately 243 days). Mapping orbits included in the first cycle were 373 through 2165. Orbits 2159-2171 were used for an interferometry test, and orbits 2172-2175 were used to conduct an orbit trim maneuver (OTM). Spacecraft Id : MGN Target Name : VENUS Mission Phase Start Time : 1990-09-15 Mission Phase Stop Time : 1991-05-15 Spacecraft Operations Type : ORBITER MAPPING CYCLE 2 MISSION.CAT... Page 148 --------------- The second mapping cycle extended from completion of the first mapping cycle through an additional cycle of mapping. Acquisition of 'right-looking' SAR data was emphasized. Orbits included in the second cycle were 2176 through 3976. Radio occultation measurements were first carried out on orbits 3212-3214. A period of battery reconditioning followed completion of Cycle 2. Spacecraft Id : MGN Target Name : VENUS Mission Phase Start Time : 1991-05-16 Mission Phase Stop Time : 1992-01-17 Spacecraft Operations Type : ORBITER MAPPING CYCLE 3 --------------- The third mapping cycle extended from completion of battery reconditioning through an additional cycle of mapping (approximately 243 days). Acquisition of 'stereo' SAR data was emphasized. Orbits included in the third cycle were 4031 through 5747. Spacecraft Id : MGN Target Name : VENUS Mission Phase Start Time : 1992-01-24 Mission Phase Stop Time : 1992-09-14 Spacecraft Operations Type : ORBITER MAPPING CYCLE 4 --------------- The fourth mapping cycle extended from completion of the third mapping cycle through an additional cycle of mapping. Acquisition of radio tracking data for gravity studies was emphasized. Radio occultation measurements were carried out on orbits 6369, 6370, 6471, and 6472. Because of poor observing geometry for gravity data collection at the beginning of the cycle, this cycle was extended 10 days beyond the nominal 243 days. Orbits included within the fourth cycle were 5748 through 7626. Periapsis was lowered on orbit 5752 to improve sensitivity to gravity features in Cycle 4. Spacecraft Id : MGN Target Name : VENUS Mission Phase Start Time : 1992-09-14 Mission Phase Stop Time : 1993-05-25 Spacecraft Operations Type : ORBITER AEROBRAKING ----------- The aerobraking phase extended from completion of the fourth mapping cycle through achievement of a near-circular orbit. Circularization was achieved more quickly than expected; the first gravity data collection in the circular orbit was not scheduled until 11 days later. Orbits included within the aerobraking phase were 7627 through 8392. MISSION.CAT... Page 149 Spacecraft Id : MGN Target Name : VENUS Mission Phase Start Time : 1993-05-26 Mission Phase Stop Time : 1993-08-05 Spacecraft Operations Type : ORBITER MAPPING CYCLE 5 --------------- The fifth mapping cycle extended from completion of the aerobraking phase through an additional cycle of mapping (approximately 243 days). Acquisition of radio tracking data for gravity studies was emphasized. The first orbit in the fifth cycle was orbit 8393, and the last was orbit 12248. Spacecraft Id : MGN Target Name : VENUS Mission Phase Start Time : 1993-08-16 Mission Phase Stop Time : 1994-04-15 Spacecraft Operations Type : ORBITER MAPPING CYCLE 6 --------------- The sixth mapping cycle extended from completion of the fifth mapping cycle through an additional cycle of mapping (approximately 180 days). Acquisition of radio tracking data for gravity studies was emphasized. The first orbit in the sixth cycle was orbit 12249, and the last was orbit 15032. The sixth cycle ended when radio contact was lost as the spacecraft entered the atmosphere and was destroyed in a 'terminal windmill' experiment. Spacecraft Id : MGN Target Name : VENUS Mission Phase Start Time : 1994-04-16 Mission Phase Stop Time : 1994-10-12 Spacecraft Operations Type : ORBITER " MISSION_OBJECTIVES_SUMMARY = " Volcanic and Tectonic Processes =============================== Magellan images of the Venus surface show widespread evidence for volcanic activity. A major goal of the Magellan mission was to provide a detailed global characterization of volcanic landforms on Venus and an understanding of the mechanics of volcanism in the Venus context. Of particular interest was the role of volcanism in transporting heat through the lithosphere. While this goal will largely be accomplished by a careful analysis of images of volcanic features and of the geological relationships of these features to tectonic and impact structures, an essential aspect of characterization will be an integration of image data with altimetry and other measurements of surface properties. Explosive pyroclastic volcanism should not occur in the present Venus environment, unless the magma contains amounts of volatiles that are large by terrestrial experience. Thus, MISSION.CAT... Page 150 evidence for extensive pyroclastic deposits would imply the presence of large amounts of volatiles or, if the deposits are old, may suggest historic changes in atmospheric density. Such ideas can be tested using SAR and altimetry data, combined with knowledge of the local geopotential field and may shed light on magma dynamics. Measurements of longitudinal and transverse slope, flow margin relief, and flow surface relief also provide powerful constraints on flow models, as well as on the rheological properties and physical state of the lava. A parallel goal was the global characterization of tectonic features on Venus and an appreciation of the tectonic evolution of the planet. This goal addressed issues on several scales. On the scale of individual tectonic features is the mechanical nature of the faulting process, the documentation of geometry and sense of fault slip, and the relationship between mechanical and thermal properties of the lithosphere. On a somewhat broader scale is linking groups of features to specific processes (e.g., uplift, orogeny, gravity sliding, flexure, compression or extension of the lithosphere) and testing quantitative models for these processes with SAR images and supporting topographic, gravitational, and surface compositional data. On a global scale is the question of whether spatially coherent, large-scale patterns in tectonic behavior are discernible, patterns that might be related to an organized system of plates or to mantle convective flow For more information on volcanic and tectonic investigations see papers by [HEADETAL1992] and [SOLOMONETAL1992], respectively. Impact Processes ================ The final physical form of an impact crater has meaning only when the effects of the cratering event and any subsequent modification of the crater can be distinguished. To this end, a careful search of the SAR images can identify and characterize both relatively pristine and degraded impact craters, together with their ejecta deposits (in each size range) as well as distinguishing impact craters from those of volcanic origin. The topographic measures of depth-to-diameter ratio, ejecta thickness distribution as a function of distance from the crater, and the relief of central peaks contribute to this documentation. It is expected that several time-dependent processes influence the change in appearance of craters with increasing crater age, including continued bombardment of the surface, variations in the mechanical properties of the lithosphere (as a result of cooling or loss of near-surface volatiles), horizontal deformation of the lithosphere, possible variations in the mass of the atmosphere, volcanism, and finally, surface erosion and deposition. Distinguishing and understanding these processes constitute important components of the study of crater morphology. Beyond their intrinsic interest in providing a record of impact and deformational processes, craters provide a tool for the relative dating of surface geological units. Relative ages can be established from a comparison of the variations in the areal MISSION.CAT... Page 151 density of craters of a given size as well as from a comparison of the maximum extent to which different craters are degraded. Together with superpositional relationships (a lava flow that covers an older fault) and transectional relationships (a graben that cuts through an older volcano), the relative temporal evolution of large areas of the Venus surface can be reconstructed. For more information on investigations of impact processes see [SCHABERETAL1992]. Erosional, Depositional, and Chemical Processes =============================================== The nature of erosional and depositional processes on Venus is poorly known, primarily because the diagnostic landforms typically occur at a scale too small to have been resolved in Earth-based or Venera 15/16 radar images. Magellan images show wind eroded terrains, landforms produced by deposition (dune fields), possible landslides and other down slope movements, as well as aeolian features such as radar bright or dark streaks 'downwind' from prominent topographic anomalies. One measure of weathering, erosion, and deposition is provided by the extent to which soil covers the surface (for Venus, the term soil is used for porous material, as implied by its relatively low value of bulk dielectric constant). The existence of such material, and its dependence on elevation and geologic setting, provide important insights into the interactions that have taken place between the atmosphere and the lithosphere. Because of the inference drawn from the deuterium-to-hydrogen ratio of the present atmosphere for the past existence of substantial amounts of water on Venus, radar images continue to be searched for evidence of past episodes of fluvial activity (drainage systems) and for lake beds and coastal signatures (strandlines). The existence of a thick and cloudy atmosphere precludes infrared, visual, ultraviolet, x-ray, or gamma-ray observation of the Venus surface from orbit. Thus it is impossible to obtain information on a global basis about the surface composition or mineralogy using remote-sensing techniques at these wavelengths. Pioneer Venus and Magellan have disclosed that very often the surfaces of elevated regions possess both anomalously high values of normal-incidence radar reflectivity, occasionally exceeding 0.43, and associated low values of radio emissivity, reaching as low as 0.50. In the absence of liquid water, which is known from a variety of evidence not to be present today on Venus, it is necessary to assume a surface composition that would be unusual in terrestrial experience to explain values of dielectric constant implied by these observations. The most acceptable of the current hypotheses requires a significant number of electrically conducting elements in surface materials. If these are iron sulfides, as some chemical evidence suggests, they may possibly be brought to the surface by volcanic activity. The good spatial resolution of the Magellan instrumentation, both in determining the surface reflectivity from the altimetric observations and in measuring the emissivity from radiometric observations, promises to outline the structure of these regions and may shed light on MISSION.CAT... Page 152 their origin. Results will be applied to testing hypotheses for regional and global buffering of atmospheric composition by reactions with crustal materials. For more information on erosional, depositional, and chemical processes see papers by [ARVIDSONETAL1992], [GREELEYETAL1992], and [GREELEYETAL1994]. Isostatic and Convective Processes ================================== Topography and gravity are intimately and inextricably related, and must be jointly examined when undertaking geophysical investigations of the interior of a planet, where isostatic and convective processes dominate. Topography provides a surface boundary condition for modeling the interior density of Venus. Modeling of the interior density using gravity data is, of course, nonunique. Meaningful interpretation rests on integrating other data sets and/or incorporating specific mechanical models of the interior. For example, a single density interface underlying the known topography can be found that exactly matches any observed gravity field. The interface can be at any depth; the greater the depth, the larger the density contrast needed. The thickness of the elastic lithosphere of Venus, i.e., the outer region of the planet that behaves elastically over geologically long periods of time, is of special interest. The base of this zone is likely to be defined by a specific isotherm whose location depends on the particular temperature-dependent flow or creep properties of the material underneath. If this isotherm can be mapped in space and time, then models for the thermal evolution of the planet can be developed. The key to determining lithospheric thickness variations in space and time is through flexure studies. If a mass load, e.g., a shield volcano or a mascon, is placed on the planetary surface, then the elastic lithosphere will flex under the load. The controlling parameter is the flexural rigidity, which is dependent on the elastic constants and lithospheric thickness. Crucial to applying estimates of flexural rigidity to the task of unraveling the thermal history is an estimate of when the load was emplaced. Thus age determinations derived by various geologic techniques are essential to this scheme. For more information on topography and gravity see papers by [FORD&PETTENGILL1992], [ICARUSMGN1994], [KONOPLIVETAL1993], and [MCNAMEEETAL1993]. " END_OBJECT = MISSION_INFORMATION OBJECT = MISSION_HOST INSTRUMENT_HOST_ID = "MGN" OBJECT = MISSION_TARGET TARGET_NAME = "VENUS" END_OBJECT = MISSION_TARGET END_OBJECT = MISSION_HOST MISSION.CAT... 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Page 158 END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "ARVIDSONETAL1992" REFERENCE_DESC = "Arvidson, R. E., R. Greeley, M.C. Malin, R.S. Saunders, N. Izenberg, J.J. Plaut, E.R. Stofan, and M.K. Shepard, Surface Modification of Venus as Inferred from Magellan Observations of Plains, Journal of Geophysical Research, 97, 13303-13317, 1992" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "BARRY1987" REFERENCE_DESC = "Barry, S., Magellan Mission Operations System: Radar System Interface Requirements, Hughes Aircraft Co. Report HS513-823-3, May 1987" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "BRILL&MEISL1990" REFERENCE_DESC = "Brill, R., C. and Meisl, Magellan Altimeter Processing: Algorithms and Constants, Jet Propulsion Laboratory Document D-6143, 15 February 1990" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "CAMPBELLETAL1992" REFERENCE_DESC = "Campbell, D. B., N.J.S. Stacy, W.I. Newman, R.E. Arvidson, E.M. Jones, G.S. Musser, A.Y. Roper, and C. Schaller, Magellan Observations of Extended Impact Crater Related Features on the Surface of Venus, Journal of Geophysical Research, 97, 16249-16277, 1992" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "CAMPBELLETAL1992B" REFERENCE_DESC = "Campbell, B. A., and D.B. Campbell, Analysis of Volcanic Surface Morphology on Venus from Comparison of Arecibo, Magellan, and Terrestrial Airborne Radar Data, Journal of Geophysical Research, 97, 16293-16314, 1992" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "CUEVAS1989" REFERENCE_DESC = "Cuevas, C., Magellan Radar Sensor Compensation Report, Hughes Aircraft Co. Report HS513- 5029, 18 August 1989" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "DAVIESETAL1992" REFERENCE_DESC = "Davies, M.E., T.R. Colvin, P.G. Rogers, P.W. Chodas, W.L. Sjogren, E.L. Akim, V.A. Stepanyantz, Z.P. Vlasova, and A.I. Zakharov, The Rotation Period, Direction of the North Pole, and Geodetic Control Network of Venus, Journal of Geophysical Research, 97, 13141- 13151, 1992." END_OBJECT = REFERENCE OBJECT = REFERENCE REFS.CAT... Page 159 REFERENCE_KEY_ID = "FORD&PETTENGILL1992" REFERENCE_DESC = "Ford, P. G., and G.H. Pettengill, Venus Topography and Kilometer-Scale Slopes, Journal of Geophysical Research, 97, 13103-13114, 1992" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "GREELEYETAL1992" REFERENCE_DESC = "Greeley, R., R.E. Arvidson, C. Elachi, M.A. Geringer, J.J. Plaut, R.S. Saunders, G. Schubert, E.R. Stofan, E.J.P. Thouvenot, S.D. Wall, C.M. and Weitz, Aeolian Features on Venus: Preliminary Magellan Results, Journal of Geophysical Research, 97, 13319-13345, 1992" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "GREELEYETAL1994" REFERENCE_DESC = "Greeley, R., G. Schubert D. Limonadi, K.C. Bender, W.I. Newman, P.E. Thomas, C.M. Weitz, and S.D. Wall, Wind Streaks on Venus: Clues to Atmospheric Circulation, Science, 263, 358-361, 1994" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "HEAD1991" REFERENCE_DESC = "Head, J. W., D.B. Campbell, C. Elachi, J.E. Guest, D.P. McKenzie, R.S. Saunders, G.G. Schaber, G. Schubert, Venus Volcanism: Initial Analysis from Magellan Data, Science, V. 252, pp. 276 - 288, 1991" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "HEADETAL1992" REFERENCE_DESC = "Head, J.W., L.S. Crumpler, J.C. Aubele, J.E. Guest, and R.S Saunders, Venus Volcanism: Classification of Volcanic Features and Structures, Associations, and Global Distribution from Magellan Data, Journal of Geophysical Research, 97, 13153-13197, 1992." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "JGRMGN1992" REFERENCE_DESC = "Magellan at Venus special issues, Journal of Geophysical Research, 97, Nos. E8 and E10, 13063-13689 and 15921-16382, 1992." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "JOHNSON1990" REFERENCE_DESC = "W.T.K. Johnson, Magellan Imaging Radar to unveil Venus, Microwave System News, vol. 20, no. 3, pp. 25-31, 1990." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "KONOPLIVETAL1993" REFERENCE_DESC = "Konopliv, A.S., N.J. Borderies, P.W. Chodas, E.J. Christensen, W.L. Sjogren, and B.G. Williams, Venus Gravity and Topography: 60th Degree and Order Model, Geophysical Research Letters, 20, 2403-2406, 1993." REFS.CAT... Page 160 END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "LYONS1988" REFERENCE_DESC = "Lyons, D.T., Magellan Planetary Constants and Models, JPL D-2300, Jet Propulsion Laboratory, Pasadena, Calif., 1988." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "MCNAMEEETAL1993" REFERENCE_DESC = "McNamee, J.B., N.J. Borderies, and W.L. Sjogren, Venus: Global Gravity and Topography, Journal of Geophysical Research, 98, 9113-9128, 1993." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "PDSSR1992" REFERENCE_DESC = "Planetary Data System Standards Reference, Jet Propulsion Laboratory Document D-7669, Part 2, 20 November 1992" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "PETTENGILL1988" REFERENCE_DESC = "Pettengill, G. H., Magellan Venus Radar Mapper Science Experiment Plan of the Radar Investigation Group (RADIG), MIT/JPL, 1988." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "PETTENGILL1991" REFERENCE_DESC = "Pettengill, G. H., P.G. Ford, W.T.K. Johnson, R.K. Raney, L.A. Soderblom, Magellan: Radar Performance and Data Products, Science, V. 252, pp. 260 - 265, 1991" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "PETTENGILLETAL1992" REFERENCE_DESC = "Pettengill, G. H., P.G. Ford, and R.J. Wilt, Venus Surface Radiothermal Emission as Observed by Magellan, Journal of Geophysical Research, 13091- 13102, 1992." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "PHILLIPS1991" REFERENCE_DESC = "Phillips, R. J., R.E. Arvidson, J.M. Boyce, D.B. Campbell, J.E. Guest, G.G. Schaber, L.A. Soderblom, Impact craters on Venus: Initial Analysis from Magellan, Science, V. 252, pp. 288 - 297, 1991" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "PLAUT&ARVIDSON1992" REFERENCE_DESC = "Plaut, J. J., and R.E. Arvidson, Comparison of Goldstone and Magellan Radar Data in the Equatorial Plains of Venus, Journal of Geophysical REFS.CAT... Page 161 Research, 97, 16279-16291, 1992" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "SAUNDERSETAL1990" REFERENCE_DESC = "Saunders, R.S., G.H. Pettengill, R.E. Arvidson, W.L. Sjogren, W.T.K. Johnson, L. Pieri, The Magellan Venus Radar Mapping Mission, Journal of Geophysical Research, 95, 8339-8355, 1990." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "SAUNDERS1991A" REFERENCE_DESC = "Saunders, R. S., R.E. Arvidson, J.W. Head III, G.G. Schaber, E.R. Stofan, and S.C. Solomon, An Overview of Venus Geology, Science, V. 252, pp. 249 - 252, 1991" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "SAUNDERS1991B" REFERENCE_DESC = "Saunders, R. S., G.H. Pettengill, Magellan: Mission Summary, Science, V. 252, pp. 247 - 249, 1991" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "SAUNDERSETAL1992" REFERENCE_DESC = "Saunders, R. S., A.J. Spear, P.C. Allin, R.S. Austin, A.L. Berman, R.C. Chandlee, J. Clark, A.V. deCharon, E.M. DeJong, D.G. Griffith, J.M. Gunn, S. Hensley, W.T.K. Johnson, C.E. Kirby, K.S. Leung, D.T. Lyons, G.A. Michaels, J. Miller, R.B. Morris, A.D. Morrison, R.G. Piereson, J.F. Scott, S.J. Shaffer, J.P. Slonski, E.R. Stofan, T.W. Thompson, and S.D. Wall, Magellan Mission Summary, Journal of Geophysical Research, 97, 13067-13090, 1992." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "SCHABERETAL1992" REFERENCE_DESC = "Schaber, G.G., R.G. Strom, H.J. Moore, L.A. Soderblom, R.L. Kirk, D.J. Chadwick, D.D. Dawson, L.R. Gaddis, J.M. Boyce, and J. Russell, Geology and Distribution of Impact Craters on Venus: What Are They Telling Us? Journal of Geophysical Research, 97, 13257-13301, 1992." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "SCIEDR" REFERENCE_DESC = "Project Magellan Software Interface Specification: Magellan Science EDR (TPS-101), 30 January 1991" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "SDPS101" REFERENCE_DESC = "Project Magellan Software Interface Specification: Full-Resolution Basic Image Data Record, Revision E, 31 August 1992" END_OBJECT = REFERENCE REFS.CAT... Page 162 OBJECT = REFERENCE REFERENCE_KEY_ID = "SE011" REFERENCE_DESC = "Magellan Project Radar System: Analysis Methods and Performance Estimates, Hughes Aircraft Co. Report HS513-062-49, July 1989" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "SOLOMON1991A" REFERENCE_DESC = "Solomon, S. C., J.W. Head, W.M. Kaula, D. McKenzie, B. Parsons, R.J. Phillips, G. Schubert, and M. Talwani, Venus Tectonics: Initial Analysis from Magellan, Science, V. 252, pp. 297 - 312, 1991" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "SOLOMON1991B" REFERENCE_DESC = "Solomon, S. C., J.W. Head, Fundamental Issues in the Geology of Venus, Science, V. 252, pp. 252 - 260, 1991" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "SOLOMONETAL1992" REFERENCE_DESC = "Solomon, S.C., S.E. Smrekar, D.L. Bindschadler, R.E. Grimm, W.M. Kaula, G.E. McGill, R.J. Phillips, R.S. Saunders, G. Schubert, S.W. Squyres, and E.R. Stofan, Venus Tectonics: An Overview of Magellan Observations, Journal of Geophysical Research, 97, 13199-13255, 1992, and Journal of Geophysical Research, 97, 16381, 1992." END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "TYLER1991" REFERENCE_DESC = "Tyler, G. L., P.G. Ford, D.B. Campbell, C. Elachi, G.H. Pettengill, R.A. Simpson, Magellan: Electrical and Physical Properties of Venus' Surface, Science, V. 252, pp. 265 - 270, 1991" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "TYLER1992" REFERENCE_DESC = "Tyler, G. L., R.A. Simpson, M.J. Maurer, and E. Holmann, Scattering Properties of the Venusian Surface: Preliminary Results from Magellan, Journal of Geophysical Research, 97, 13115-13139, 1992" END_OBJECT = REFERENCE OBJECT = REFERENCE REFERENCE_KEY_ID = "VRMPP1983" REFERENCE_DESC = "Venus Radar Mapper Project Plan, Document 630-1, JPL D-814, 157 pp., Jet Propulsion Laboratory, Pasadena, Calif., 1983." END_OBJECT = REFERENCE END REFS.CAT... Page 163 C.14. VOLDESC.CAT Example CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 OBJECT = VOLUME VOLUME_SERIES_NAME = "MISSION TO VENUS" VOLUME_SET_NAME = "MAGELLAN SURFACE CHARACTERISTICS VECTOR DATA RECORD" VOLUME_SET_ID = "USA_NASA_PDS_MG_2101_TO_MG_2149" VOLUMES = 49 VOLUME_NAME = "SCVDR CD Volume 1" VOLUME_ID = "MG_2101" VOLUME_VERSION_ID = "VERSION 1" PUBLICATION_DATE = 1995-01-01 DATA_SET_ID = "MGN-V-RDRS-5-SCVDR-V1.0" VOLUME_FORMAT = "ISO-9660" MEDIUM_TYPE = "CD-WO" DESCRIPTION = "This volume contains Magellan SCVDR (Surface Characteristics Vector Data Record) products. It also contains documentation files that describe the SCVDRs." MISSION_NAME = "MAGELLAN" SPACECRAFT_NAME = "MAGELLAN" SPACECRAFT_ID = MGN OBJECT = DATA_PRODUCER INSTITUTION_NAME = "STANFORD UNIVERSITY" FACILITY_NAME = "CENTER FOR RADAR ASTRONOMY" FULL_NAME = "DR. G. LEONARD TYLER" ADDRESS_TEXT = "STARLAB DURAND BLDG, ROOM 232 STANFORD, CALIFORNIA, 94305-4055, USA" END_OBJECT = DATA_PRODUCER OBJECT = CATALOG ^DATA_SET_CATALOG = "DATASET.CAT" ^INSTRUMENT_CATALOG = "INST.CAT" ^INSTRUMENT_HOST_CATALOG = "INSTHOST.CAT" ^MISSION_CATALOG = "MISSION.CAT" ^PERSONNEL_CATALOG = "PERSONEL.CAT" ^REFERENCE_CATALOG = "REFS.CAT" END_OBJECT = CATALOG END_OBJECT = VOLUME END VOLDESC.CAT... Page 164