PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 1998-09-29 NOTE = "N/A" END_OBJECT = TEXT END Viking Lander Rock Population Archival Data Set (VL1/VL2-M-LCS-5-ROCKS-V1.0) AAREADME.TXT 29 September 1998 R.A. Simpson Stanford University ============================================================================== INTRODUCTION ============================================================================== This compact disc contains data on Mars rock populations near Viking Lander sites. The data were derived from Lander images and include rock locations, orientations, and dimensions as well as derived statistical measures of number density and areal coverage. Two intermediate products are also included. With minor corrections for data entry errors, this data set replicates the one described by H.J. Moore and J.M. Keller in the 1990 and 1991 NASA Reports of the Planetary Geology and Geophysics Program. The data are presented in the form of twelve tables. The total volume of the data set is about 0.8 MBytes. The VOLUME_ID for the data set is VL_9001. ============================================================================== VOLUME SET INFORMATION ============================================================================== The diagram below shows the organization of the volume, starting from the root of the compact disc. The tables of rock data, intermediate results, and statistics are in the DATA directory. VL1ROCKS.TAB and VL2ROCKS.TAB contain basic information on rock location, dimensions, and orientation for the Viking Lander sites 1 and 2, respectively. VL0ROCKS.TAB is identical to VL1ROCKS.TAB except that two "rocks," considered by some to be exposures of bedrock, have been omitted. The tables VL*NORML.TAB give the normalized number density and areal coverage results for the corresponding VL*ROCKS.TAB input tables. VL*AXRAT.TAB and VL*SURFS.TAB files give rock axial ratios and rock distributions according to surface type; these intermediate results may be of interest to users seeking alternative descriptors of the rock population. root | |- AAREADME.TXT |- ERRATA.TXT |- VOLDESC.CAT | |- CATALOG | | | |- CATINFO.TXT Streamlined PDS catalog files | |- MISSION.CAT for mission, host, instrument, | |- VL1HOST.CAT references, personnel, and | |- VL2HOST.CAT data set. | |- VL1CAM1.CAT | |- VL1CAM2.CAT | |- VL2CAM1.CAT | |- VL2CAM2.CAT | |- DATASET.CAT | |- PERSON.CAT | |- REF.CAT | |- DOCUMENT | | | |- DOCINFO.TXT Overview of directory | |- KEYWORDS.TXT Keywords and definitions | |- VLRCKSIS.TXT SIS document for this data set | |- INDEX | | | |- INDXINFO.TXT Overview of directory | |- INDEX.LBL Label to INDEX.TAB | |- INDEX.TAB List of data file contents, this volume | |- SOFTWARE | | | |- SOFTINFO.TXT Overview of directory | |- ROCKANA.F FORTRAN 77 source code for analysis | program | `- DATA | |- VL0ROCKS.TAB Data files and detached PDS labels |- VL0AXRAT.TAB (labels are not shown) |- VL0SURFS.TAB |- VL0NORML.TAB |- VL1ROCKS.TAB |- VL1AXRAT.TAB |- VL1SURFS.TAB |- VL1NORML.TAB |- VL2ROCKS.TAB |- VL2AXRAT.TAB |- VL2SURFS.TAB `- VL2NORML.TAB ============================================================================== ERRATA ============================================================================== A cumulative list of errors, changes, and comments is maintained in the file ERRATA.TXT at the root level of each volume. ERRATA.TXT in higher version numbers will have errors for earlier versions. ============================================================================== DISC FORMAT ============================================================================== The disc is organized according to the PDS standard for "one data set, one volume." This file (AAREADME.TXT), a PDS volume object definition (VOLDESC.CAT), and the listing of errors and changes (ERRATA.TXT) are included at the root level. The following directories of descriptive material are also at the root level: CATALOG contains descriptive files for cataloging the data on this disc. DOCUMENT contains a plain text Software Interface Specification (SIS) for the data set. INDEX contains index information on each of the data files included in this disc. SOFTWARE contains FORTRAN 77 source code for an analysis program that will generate VL1NORML.TAB from VL1ROCKS.TAB (for example) The remaining directory at the root level (DATA) contains data files and detached PDS labels. ============================================================================== FILE FORMAT ============================================================================== All data files on the disc are accompanied by detached PDS labels, which describe their contents. PDS TEXT objects have attached labels. Detached labels have the same file name as the data file except that the label name has the suffix "LBL". Text files, including data files of ASCII text and all labels (*.LBL files) and tables (*.TAB files), are delimited with carriage-return (ASCII 13) line-feed (ASCII 10) pairs at the end of each line. Detached labels and text files (*.TXT file names) have fixed length records of 80 bytes to facilitate their use as either fixed-length record files or as stream files with carriage-return line-feed delimiters. Catalog files (*.CAT files) have fixed length records of 72 bytes ending with a carriage-return line-feed pair. The VOLDESC.CAT file in the root is an exception; it has 80 byte fixed-length records. ============================================================================== SOFTWARE ============================================================================== FORTRAN 77 source code for statistical analysis of the files of basic rock data (VL1ROCKS.TAB, VL2ROCKS.TAB, and VL0ROCKS.TAB) can be found in the SOFTWARE directory. The program will recreate rock number density and areal coverage statistics from the basic rock data (e.g., VL1NORML.TAB from VL1ROCKS.TAB). Intermediate results, such as VL1AXRAT.TAB and VL1SURFS.TAB, are also output. The software was run under Solaris 2.5.1 (SunSoft Fortran 77 4.0) and was found to be useful at Stanford. It carries no warranties. ============================================================================== ACKNOWLEDGMENTS ============================================================================== The basic rock data were collected under auspices of the Viking '75 Project and the NASA Planetary Geology and Geophysics Program and were provided by Henry J. Moore of the U.S. Geological Survey, Menlo Park, CA. The software, intermediate files, and final statistical distributions were generated at Stanford University by Richard Simpson with assistance from Henry Moore and John Baron. The recent work was supported partially by the NASA Planetary Geology and Geophysics Program and the NASA Planetary Data System. ============================================================================== DISCLAIMER ============================================================================== Although considerable care has gone into making this volume set, errors are both possible and likely. Users of the data are advised to exercise the same caution as they would when dealing with any other unknown data set. Reports of errors or difficulties would be appreciated. Please contact one of the persons listed below. ============================================================================== COGNIZANT PERSONNEL ============================================================================== The person most directly responsible for construction and release of this volume set is Dick Simpson, Radio Science Advisor to the Planetary Data System. Although many people contributed to the volume set, any faults in the product are his alone. Richard A. Simpson Center for Radar Astronomy Durand Bldg - Room 232 Stanford University Stanford, CA 94305-9515 Tel: 650-723-3525 FAX: 650-723-9251 rsimpson@magellan.stanford.edu Henry J. Moore (deceased 1998-09-21) Branch of Astrogeology U.S. Geological Survey 345 Middlefield Road Menlo Park, CA 94025-3591 Tel: 650-329-5175 FAX: 650-329-4936 moore@astmnl.wr.usgs.gov Planetary Data System, PDS Operator MS 202-101 Jet Propulsion Laboratory 4800 Oak Grove Drive Pasadena, CA 91109-8099 Tel: 818-354-4321 pds_operator@jpl.nasa.gov