NJPL1I00PDS100000000 = SFDU_LABEL RECORD_TYPE = STREAM OBJECT = TEXT NOTE = "Introduction to this CD-ROM volume." END_OBJECT END AAREADME.TXT: Introduction to the Viking IRTM CDROM H. Kieffer, 22aug89 OVERVIEW This CDROM contains data from the Viking Infrared Thermal Mapper (IRTM) investigation. The two Viking orbiters were active in orbit about Mars during the years 1976 to 1980. The data, software and descriptive information were produced almost entirely by the Radiometry Testbed Node of the Planetary Data System (PDS). Both the data structures and the software are descendants of the data analysis system used by the IRTM team during the Viking mission. The data structure is similiar to that on the 1600 bpi magnetic tape set that was the basic storage and distribution form of the data from about 1980 to 1989, and from which the files on this disk were derived. These "TSDR" (time sequential data record) tapes contained only data acquired while the IRTM was pointing at or within 1.5 degrees of Mars, and hence they, and this disk, do not contain observations of Phobos or Deimos or of space. A general description of the structure of the major data files (chunks) is contained in the file [DOCUMENT]IRTMDATA.TXT. A guide to the IRTM instrument can be found in [DOCUMENT]IRTM.TXT. This file contains the same information that is in the PDS catalog (and in VOLDESC.SFD on this disk) but with the machine-readable template structure removed. The bulk of the software on this disk is under the [SOFTWARE.RAD] directory and is the same as the "XG" system delivered to the PDS. The file [DOCUMENT]SOFTWARE.TXT contains a brief introduction to this software, and an outline of its directory structure. The [SOFTWARE.RAD.DOC...] directory contains extensive documentation of the software system; in particular, XGSDD.MEM contains the Software Design Document and XGUG.MEM contains the User Guide (these are large files). The IRTM Catalog ([CATALOG]IRTMCAT.DAT) is an independent dataset containing entries for each sequence in each of 650 10 by 10 degree bins on Mars. [DOCUMENT]IRTMCAT.TXT is a user's guide. [SOFTWARE.CAT]PRCAT.FOR is a program for reading the catalog. In addition, there is an ASCII table file (CHUNK.DAT) which contains information about each data file, and two binary table files (VO1ORBIT.DAT and VO2ORBIT.DAT) which contain time and geometry information about each orbit in the mission. These are in the [INDEX] directory. CONTENTS ROOT directory AAREADME.TXT Introductory file CATALOG Catalog files DOCUMENT Texts on instrument, data files and software INDEX Index (mission) files and their detached labels LABEL Supplementary labels (pointed to by chunk labels) SOFTWARE Software (XG system & catalog program) VO1DATA VO1 chunk files (66) and their detached labels VO2DATA VO2 chunk files (36) and their detached labels VOLDESC.SFD Machine-readable PDS catalog information CATALOG directory IRTMCAT.DAT Catalog of 80-byte entries ordered in 650 bins IRMTCAT.LBL Detached label for Catalog IRTMCATX.DAT Index to Catalog IRTMCATX.LBL Detached label for Index to Catalog DOCUMENT directory IRTM.TXT Document describing instrument and its operation IRTMCAT.TXT User's guide to IRTM catalog IRTMDATA.TXT Document describing structure of database files SOFTWARE.TXT Introductory document describing XG software INDEX directory CHUNK.DAT ASCII chunk table, 11 columns, commas between: item bytes format Chunk filename ("TSijjj") 8 (A8) [w/o .DAT] Orbiter (1 or 2) 2 (1X,I1) Orbit range 10 (2(1X,I4)) Number of observations 6 (1X,I5) Native-time range (FDS) 20 (2(1X,I9)) Event-time range 30 (2(1X,A14)) [yy-mm-ddThh:mm] Seasonal-longitude range 14 (2(1X,F6.2)) [Total] 90 (92 with CR/LF) CHUNK.LBL Detached label for CHUNK.DAT VO1ORBIT.DAT VO-1 orbit table -- binary table with 17 columns: Orbit Number of sequences Number of observations Native-time range Event-time range Seasonal longitude (L sub S) Orbital elements (6 items) Solar distance (km) Subsolar colatitude Subsolar longitude VO1ORBIT.LBL Detached label for VO1ORBIT.DAT VO2ORBIT.DAT VO-2 orbit table -- see VO-1 orbit table VO2ORBIT.LBL Detached label for VO2ORBIT.DAT TS1000.DAT Cumulative directory file for VO-1 TS1000.LBL Detached label for IRTM1000.DAT TS2000.DAT Cumulative directory file for VO-2 TS2000.LBL Detached label for IRTM2000.DAT ORBTABG.LBL Supplementary label for structure of cumulative directory orbit table. This differs from ORBTAB.LBL by having definitions of SEDR header items, which have been converted to VAX format in these files. LABEL directory (supplementary labels for chunk files) HDRTAB.LBL Structure of chunk file header table ORBTAB.LBL Structure of chunk file orbit table SEQTAB.LBL Structure of chunk file sequence table DATATAB.LBL Structure of chunk file data table SOFTWARE directory RAD: Subtree for XG system software and documentation [...] Entire [RAD.XG...] tree as delivered to PDS. CAT: Subdirectory for Catalog software and documentation PRCAT.FOR Catalog access program COGNIZANT PERSONS The persons listed below each contributed substantially to the generation of this CDROM. Hugh Kieffer was Principal Investigator for the IRTM and leader of the Radiometry Testbed Node. Bob Mehlman was the lead programmer for the IRTM team and built most of the structural description labels on this disk. Robert Gurule was the main programmer of the XG system and wrote the software for conversion to the CDROM data format while at the USGS. Debbie Cook now maintains the Radiometry software, and produced the reformatted data. Mike Martin and Jason Hyon helped design and check the many file labels, and coordinated publication of this disk. Hugh Kieffer Debbie Cook U.S. Geological Survey U.S. Geological Survey Flagstaff AZ 86001 Flagstaff AZ 86001 602-527-7000 602-527-7118 Robert Gurule Los Alamos National Laboratory Bob Mehlman Mike Martin Institute of Geophysics and Mail Stop 233-208 Planetary Physics, UCLA Jet Propulsion Laboratory Los Angeles, CA 90024 Pasadena, CA 91109 213-825-2434 818-354-8751 Jason Hyon Mail Stop 168-514 Jet Propulsion Laboratory Pasadena, CA 91109 818-354-7050