CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 SPACECRAFT_NAME = MAGELLAN TARGET_NAME = VENUS OBJECT = TEXT PUBLICATION_DATE = 1994-07-01 NOTE = "MAGELLAN C-BIDR ARCHIVE CD-WO" END_OBJECT = TEXT END MAGELLAN C-BIDR ARCHIVE CD-WO 1. Introduction This CD-WO contains Magellan C-BIDR (Compressed-Resolution Basic Image Data Record) products, including image and data files. It also contains documentation files which describe the C-BIDRs. Each C-BIDR data directory contains the compressed-resolution radar return for one orbit and the ancillary files necessary to understand the data. The C-BIDR products archived on this volume are the exact products released by the Magellan Project. 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 C-BIDR data exist is represented by a set of either 13 or 15 files (the latter when polar imaging was available), copied from the C-BIDR tape product. The files marked with an asterisk (*) are only present when the orbit imaged either the north or the south pole. CLK.DAT - SCLK/SCET conversion coefficients DCM.DAT - Decommutation and decalibration data DQS.DAT - EDR Data Quality Summary ENG.DAT - Engineering data EPH.DAT - S/C ephemeris file HDR.DAT - Orbit Header * IM1.DAT - Image data in oblique sinusoidal projection IM2.DAT - Image data in sinusoidal projection MON.DAT - DSN monitor records OPF.DAT - Per-Orbit Parameters PBW.DAT - Processing bandwidth * PR1.DAT - Processing parameters for oblique sinusoidal projection PR2.DAT - Processing parameters for sinusoidal projection QTN.DAT - Quaternion pointing coefficients SAB.DAT - Radar header records Since the image files IM1.DAT and IM2.DAT are written with varying- length data blocks, index files in VICAR-IBIS format named IM1.AUX and IM2.AUX have been created to assist certain software packages, e.g. VICAR and GIPS, to navigate efficiently through the image files. The content of each file is described in a detached PDS label, a file with the same 3-letter name and an extension of "LBL". This file may also contain a "CONFIDENCE_NOTE" that describes potential problems with the data file. Further information on C-BIDR file formats and their contents can be obtained from the Magellan Software Interface Specification documents IDPS-102, January 14, 1990, and SDPS-101, Revision E, August 31, 1991. Note: the label files for IM1.AUX and IM2.AUX are named IX1.LBL and IX2.LBL, respectively. Finally, each data directory contains a file ERR.TXT which lists all error messages from the program that created the *.AUX and *.LBL files. 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. IMAGE, 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 = ("SAB.DAT",312) indicates that the TABLE object begins at byte 312 of the file SAB.DAT, 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 ^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 CBIDRCD 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 C-BIDR dataset. | | | |- CATINFO.TXT Description of contents of the CATALOG directory. | | | |- CBIDRDS.CAT PDS dataset catalog object | | | |- INSTHOST.CAT PDS spacecraft catalog object | | | |- MISSION.CAT PDS mission catalog object | | | |- PERSONEL.CAT PDS personnel catalog object | | | |- RDRSINST.CAT PDS instrument catalog object | | | `- REFS.CAT PDS reference catalog object | |- [DOCUMENT] A directory containing document files relating | | to this disk. | | | |- CBIDRCD.LBL A detached PDS label file describing CBIDRCD.PS | | | |- CBIDRCD.PS A copy of CBIDRCD.TXT in PostScript format, | | suitable for previewing on a high-resolution | | graphics terminal or direct printing on a | | laser printer or photo-typesetter. | | | |- CBIDRCD.TXT A machine readable version of the MIT-MGN-CBIDRCD | | SIS document describing the format and content of | | the Magellan C-BIDR Archive CD-WO data files. | | | `- DOCINFO.TXT Description of contents of the DOCUMENT directory. | |- [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 C-BIDR archive data files. | | | |- INDEX.LBL Description of INDEX.TAB. | | | |- INDEX.TAB Index of C-BIDR 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. | | | |- CBIDRIM.FMT Format of BIDR image file blocks headers | | | |- CBIDRPR.FMT Format of BIDR processing parameter file records | | | |- CBIDROPF.FMT Format of BIDR orbit parameter file records. | | | |- DSMAPCB.LBL Description of the Sinusoidal and Oblique | | Sinusoidal map projections used in this data set. | | | `- LABLINFO.TXT Description of contents of the LABEL directory. | `- [Cnnnn_vv] Directories containing C-BIDR data files for | orbit `nnnn', version `vv'. | |- CLK.DAT SCLK/SCET conversion coefficients |- DCM.DAT Documentation and decalibration data |- DQS.DAT EDR Data Quality Summary |- ENG.DAT Engineering data |- EPH.DAT S/C ephemeris file |- ERR.TXT Error messages from PDS label generator |- HDR.DAT Orbit Header |- IM1.AUX *+ Index file for IM1.DAT |- IM1.DAT + Polar image data in oblique sinusoidal projection |- IM2.AUX * Index file for IM2.DAT |- IM2.DAT Non-polar image data in sinusoidal projection |- MON.DAT DSN monitor records |- OPF.DAT Per-Orbit Parameters |- PBW.DAT Processing bandwidth |- PR1.DAT + Processing parameters for IM1.DAT |- PR2.DAT Processing parameters for IM2.DAT |- QTN.DAT Quaternion pointing coefficients |- SAB.DAT Radar header records `- nnn.LBL PDS labels for the DAT and AUX files * If no polar measurements were made during a given orbit, the IM1.AUX, IM1.DAT, and PR1.DAT files will be omitted, along with their PDS label files, IM1.LBL, IX1.LBL, and PR1.LBL, respectively. + IM1.AUX and IM2.AUX contain information describing the location of data blocks in IM1.DAT and IM2.DAT respectively, in a format that is known as 'BIDRINDX' within the VICAR system. Consult IM1.LBL and IM2.LBL for further details. 5. Whom to Contact for Information For questions concerning this volume set: 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/ 6. Cognizant Persons Magellan Dr. Raymond Arvidson Archive Project Washington University Coordinator St. Louis, MO C-BIDR Data Dr. Peter Ford MIT 37-601 Volume generation, Peter Ford and Joan Quigley validation, labels, MIT catalog templates, Cambridge, MA documentation This disk was produced at MIT by Peter Ford and Joan Quigley.