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1991-11-18
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7KB
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91 lines
CCSD3ZF0000100000001NJPL3IF0PDS200000001 = SFDU_LABEL
RECORD_TYPE = STREAM
PRODUCT_CREATION_TIME = 1991-08-01
OBJECT = TEXT
NOTE = "Introduction to this CD-ROM volume."
END_OBJECT = TEXT
END
Mission to Mars
Mars Mosaicked Digital Image Model (MDIM)
This compact read-only optical disk (CD-ROM) is one of a series of seven
CD-ROM volumes containing cartographic compilations made by processing
"raw" Viking images to reduce radiometric and geometric distortions and
to form geodetically controlled Mosaicked Digital Image Models (MDIMs).
Volumes 1 through 6 contain MDIMs at 1/256, 1/64 degrees/pixel and
Airbrush Digital Shaded relief images at 1/16 and 1/4 degrees/pixel.
Volumes 1 and 6 contain MDIMs at 1/16 degrees/pixel. Volume 7 contains
planet wide coverage of MDIMs and Digital Terrain Models (DTMs) at 1/64
and 1/16 degrees/pixel.
This file is one of only a few files located in the main directory.
The VOLDESC.SFD file contains a description of the contents of this
CD-ROM volume in a format that is designed for access by computers.
Another file, ERRATA.TXT, describes errors and includes instructions
for copying files from a CD-ROM on the VMS operating system. All other
files are located in directories below the main directory. The directory
named DOCUMENT contains a text file named VOLINFO.TXT that describes in
detail the organization of this disk and the format and content of the
MDIMs and DTMs. It is recommended that you read the VOLINFO.TXT document
before trying to process image files.
The directory named INDEX contains the file IMGINDEX.TAB. This table
has descriptive information about the images on this volume (in
IMGINDEX.TAB). The index table are text files in a format that can be
read by people and computers. The tables have been designed so that
they can be loaded into most database systems for fast and efficient
searching. The VOLINFO.TXT file and the IMGINDEX.LBL files contain
information about this index table.
Within the SOFTWARE directory are subdirectories for the Sun, PC,
Macintosh, and VAX platforms. These subdirectories contain executable
versions of image display software. The file SOFTINFO.TXT in the
MAC, PC, SUN, and VAX subdirectories describes the software for each
platform in detail.
Most files on this disk have a label encoded in the Object Description
Language (ODL) developed by the Planetary Data System (PDS). An ODL
label is readable by both humans and computers. It provides a formal
description of the format and content of a file. For most files the ODL
label appears at the beginning of the file (as is the case for this
file). All image files have an embedded ODL label preceding the data in
the file. For files where labels cannot be easily included, a separate
file is provided that contains the ODL label. A pointer in the label
file indicates which file the label describes. External label files
have a '.LBL' extension. For a description of the Object Description
Language, see the document file VOLINFO.TXT in the DOCUMENT directory.
The LABEL directory contains ancillary labels in ODL format that
describe the additional structural information about the image files.
The National Aeronautics and Space Administration is charged with the
responsibility for coordination of a program of systematic exploration
of the planets by U.S. spacecraft. To this end, it finances spaceflight
missions and data analysis and research programs administered and
performed by numerous institutions. The Geological Survey of the U.S.
Department of the Interior is the agency that performs most of the
mapping in support of NASA's program of planetary exploration and
scientific research.
The digital Mars maps contained in these volumes were compiled by the
U.S. Geological Survey (USGS) under funding provided by NASA through its
Geology and Geophysics Program at NASA headquarters, Washington, DC, and
through the Mars Observer Project administered by the Jet Propulsion
Laboratory, Pasadena, California. NASA's Planetary Data System provided
the guidance and standards required to manufacture and distribute the
optical disks containing this MDIM and DTM of Mars.
Compilation of the Mars digital models was performed at USGS under the
direction of R.M. Batson, L.A. Soderblom, and Sherman S.C. Wu, Principal
Investigator and Co-Investigators, respectively. Kathleen Edwards
provided the technical management and supervision of a team of 14
technicians who compiled the MDIM. The design, layout, and production of
the CD-ROMs was performed by E.M. Eliason and A. Manley at the USGS, and
M. Martin and J. Hyon at the Jet Propulsion Laboratory.