This document provides an overview of the Mars Global Surveyor MOLA PEDR Archive, including a complete listing of the contents of the archive, below.
This archive contains science data products from observations acquired by the Mars Global Surveyor (MGS) Mars Orbiter Laser Altimeter (MOLA) instrument during the Mapping Phase of the mission.
MOLA data products include Aggregated Experiment Data Records, or AEDRs (raw data), Precision Experiment Data Records, or PEDRs (data from AEDRs with precision orbit corrections applied), and Experiment Gridded Data Records, or EGDRs (gridded products derived from PEDRs). This volume contains PEDRs.
The PEDR data set is described in the file PEDRDS.CAT in the CATALOG directory. Also in this directory are files describing the MOLA instrument (INST.CAT), the MGS spacecraft (INSTHOST.CAT) and mission (MISSION.CAT), personnel associated with this archive volume (PERSON.CAT), and a bibliography of references mentioned in these files (REF.CAT). The files in this directory are entries in the Planetary Data System online catalog.
Additional documentation is found in the DOCUMENT directory, including Software Interface Specification (SIS) documents for the PEDR data set (PEDRSIS.HTM) and for the PEDR archive volumes (ARCHSIS.HTM). A description of calibration procedures applied to MOLA data is also given.
MOLA data products are identified by orbit number in the file name and in the product ID found in the label. MOLA products from the Orbit Insertion Phase of the mission contain one orbit per file. Mapping Phase products are aggregated by day, so that one file contains several orbits. For Mapping Phase products, the orbit number in the file name and the product ID refers to the first orbit covered by that product. (Note: subtract 10000 from a MOLA mapping phase orbit number to determine the equivalent MGS Project orbit number.)
PEDRs are binary files with attached PDS labels. The format of these files is described in the PEDR Software Interface Specification (SIS) document in the DOCUMENT directory. Additional information about PDS labels is found in the Planetary Data System Standards Reference, version 3.5, October 30, 2002, JPL D-7669.
All text files on this volume are stream format files, with a carriage return (ASCII 13) and a line feed character (ASCII 10) at the end of the record. This allows the files to be read by the MacOS, DOS, and UNIX operating systems. The SIS documents in the DOCUMENT directory are given as hypertext (HTML), which can be viewed with a Web browser, and in the proprietary Adobe Portable Document Format (PDF), which can be viewed with the free software Acrobat Reader from Adobe Systems Incorporated.
Files on this volume are organized into a series of subdirectories below the top-level directory. The following table shows the structure and content of these directories. In the table, directory names are enclosed in square brackets ([]).
FILE CONTENTS
Top-level directory
|
|- AAREADME.TXT Plain text version of AAREADME.HTM.
|- AAREADME.HTM The file you are reading.
|- AAREADME.LBL PDS label for both AAREADME files.
|- ERRATA.TXT Comments and errata on this volume.
|- VOLDESC.CAT Description of the contents of this CD-ROM
| volume in object format.
|
|- [CATALOG] PDS catalog objects.
| |- CATINFO.TXT Description of files in the CATALOG directory.
| |- INST.CAT Description of the MOLA instrument.
| |- INSTHOST.CAT Description of the MGS spacecraft.
| |- MISSION.CAT Description of the MGS mission.
| |- PEDRDS.CAT Description of PEDR data set.
| |- PERSON.CAT Description of personnel associated with
| | production of this volume.
| |- REF.CAT Reference objects mentioned in *.CAT files.
|
|- [DATA]
| |- [APnnXXX] PEDR data directory, where nn represents a
| | group of 1000 orbits. For example, AP12XXX
| | includes data from orbits 12000 to 12999.
| |- APnnnnnL.B PEDR data files, where nnnnn = orbit number.
| The MOLA orbit number is equal to the MGS
| Project orbit number plus 10000, for
| Mapping Phase products.
|
|
|- [DOCUMENT] Documentation files.
| |- ARCHSIS.HTM MOLA Archive Volume SIS.
| |- ARCHSIS.LBL PDS label for ARCHSIS.HTM and ARCHSIS.PDF.
| |- ARCHSIS.PDF MOLA Archive Volume SIS in Adobe Portable
| | Document Format.
| |- CALFIGS.LBL PDS label for CALFIGS.PDF.
| |- CALFIGS.PDF Figures to accompany CALIB.PDF.
| |- CALIB.LBL PDS label for CALIB.PDF.
| |- CALIB.PDF MOLA calibration document.
| |- DOCINFO.TXT Description of files in DOCUMENT directory.
| |- FIGURE1.GIF Figure 1 used in ARCHSIS.HTM.
| |- PEDRSIS.HTM MOLA PEDR SIS.
| |- PEDRSIS.LBL PDS label for PEDRSIS.HTM and PEDRSIS.PDF.
| |- PEDRSIS.PDF MOLA PEDR SIS in Adobe Portable Document
| Format.
|
|- [INDEX] Index files.
| |- INDXINFO.TXT Description of files in the INDEX directory.
| |- INDEX.LBL PDS label for INDEX.TAB.
| |- INDEX.TAB Index table of PEDR products on this volume.
|
|- [LABEL] Format files referenced by data product labels.
| |- LABINFO.TXT Description of files in the LABEL directory.
| |- PEDRENGn.FMT Describes the format of the second section
| | of a PEDR, where n=1 through 7. Seven
| | different record formats are possible,
| | depending on which of seven frames is
| | recorded.
| |- PEDRSEC1.FMT Describes the format of the first section
| | of a PEDR.
| |- PEDRSEC3.FMT Describes the format of the third section
| of a PEDR.
|
|- [SOFTWARE] Software for accessing PEDR files.
|- SOFTINFO.TXT Description of files in SOFTWARE directory.
|
|- [MPROF] Directory containing MPROF software to
| | generate PEDR topography profiles.
| |
| |- MPRFINFO.TXT Instructions for using MPROF.PRO.
| |- MPROF.PRO PC/Windows version of IDL script.
|
|- [PEDR2TAB] Directory containing PEDR2TAB software
| | to generate PEDR ASCII tables.
| |
| |- [MAC] Directory containing Macintosh version.
| | |- MOLA.LBL Example PDS label for PEDR2TAB output.
| | |- P2TABPPC.HQX BINHEX file containing executable
| | | program compiled for PowerPC.
| | |- P2TINFO.TXT Instructions for using PEDR2TAB.
| | |- PEDR2TAB.F Fortran 77 source code for Macintosh.
| | |- PEDR2TAB.PRM Preferences file to be edited by user.
| |
| |- [PC] Directory containing PC/Windows version.
| | |- MOLA.LBL Example PDS label for PEDR2TAB output.
| | |- P2TINFO.TXT Instructions for using PEDR2TAB.
| | |- PEDR2TAB.EXE Executable file compiled for MS-DOS.
| | |- PEDR2TAB.F Fortran 77 source code for PC/Windows.
| | |- PEDR2TAB.PRM Preferences file to be edited by user.
| |
| |- [SUN] Directory containing Sun/UNIX version.
| |- MOLA.LBL Example PDS label for PEDR2TAB output.
| |- P2TINFO.TXT Instructions for using PEDR2TAB.
| |- PEDR2TAB.EXE Executable file compiled for Solaris 2.4.
| |- PEDR2TAB.F Fortran 77 source code for Sun/UNIX.
| |- PEDR2TAB.PRM Preferences file to be edited by user.
|
|- [SPLITORB] Directory containing SPLITORB software
| to separate a PEDR into single orbits.
|
|- SPLTINFO.TXT Instructions for using SPLITORB.PRO.
|- SPLITORB.PRO Script for use with UNIX or PC versions
of IDL.
For questions concerning this data set collection:
PDS Geosciences Node
Washington University
Dept. of Earth and Planetary Sciences
1 Brookings Drive
St. Louis, MO 63130
314-935-5493
WWW Site: http://pds-geosciences.wustl.edu
Electronic mail address: geosci@wunder.wustl.eduMOLA Science Team
Code 920
NASA / Goddard Space Flight Center
Greenbelt, MD 20771
WWW Site: http://ssed.gsfc.nasa.gov/tharsis/mola.html
Electronic mail address: Gregory.Neumann@GSFC.NASA.GOV
MOLA data were provided by David Smith, MOLA Principal Investigator, with assistance from Greg Neumann, both of NASA/Goddard Space Flight Center, and Peter Ford, MIT.
This volume was designed and produced by Susan Slavney, Planetary Data System Geosciences Node, Washington University, St. Louis, Missouri.
The MOLA PEDR data set published on this volume may be cited in published literature using the following reference.
Smith, D., G. Neumann, P. Ford, R. E. Arvidson, E. A. Guinness, and S. Slavney, "Mars Global Surveyor Laser Altimeter Precision Experiment Data Record", NASA Planetary Data System, MGS-M-MOLA-3-PEDR-L1A-V1.0, 1999.