CCSD3ZF0000100000001NJPL3IF0PDS200000001 = SFDU_LABEL 
RECORD_TYPE                    = STREAM 
PRODUCT_CREATION_TIME          = 1993-08-12 
OBJECT                         = TEXT 
  NOTE                         = "Introduction to this CD-ROM volume." 
END_OBJECT                     = TEXT 
END 

                            Mission to Mars 

This compact read-only optical disk (CD-ROM) is one of a series of
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). 

                        Volume Series Contents
                             
   Volumes  1- 6: Global Coverage of Black/White MDIMs at 1/256-th 
                  degree/pixel. (231 meters/pixel)

   Volume      7: Global Coverage of Digital Terrain Model (DTM) 
                  and Black/White MDIMs at 1/64-th degree/pixel.
                  (925 meters/pixel)

   Volumes  8-13: Multi-look Color MDIMs at 1/64-th degree/pixel.
                  Volumes contain mulitiple color views of the
                  Martian surface. Planet wide coverage is 
                  incomplete.

   Volume     14: Multi-look Color MDIMs at 1/64-th degree/pixel.
                  The SPECIAL subdirectory contains full mosaics
                  at a variety of resolutions from 1/8-th to 1/64-th
                  degree/pixel.

                  The images on this volume are stored as 8-bit, 
                  paletted color images using the CompuServe 
                  Graphics Interchange Format (GIF).  Unlike Volumes
                  8-13, data has been pre-stretched for optimal color
                  display. The CompuServe Graphics Interchange Format 
                  is commonly used to exchange documents and graphics
                  on the CompuServe Information Service, and to pass
                  graphics between different types of computers.
                  

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 may exist, ERRATA.TXT, describing possible problems with
the CDROM. If it exists, then it includes instructions for resolving
these problems.  

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. It is recommended that you read the
VOLINFO.TXT document before trying to process image files. 

The directory named INDEX contains the image index files for the
volume series.  This table  has descriptive information about the
images on this volume. 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 label file contain 
information about this index table. 

Within the SOFTWARE directory are subdirectories for the Sun, PC, 
Macintosh and INDIGO. These subdirectories contain executable 
versions of image display software. The file SOFTINFO.TXT in the MAC,
PC, SUN, and INDIGO subdirectories describes the software for each 
platform in detail.  NOTE:  There is a driver patch in the SUN 
subdirectory which must be installed to access the GIF image files on 
this disk.  Please read the file PATCH.TXT for installation instructions.
There is also a copy program located in VAX subdirectory 
which will move the files in the ERRATA subdirectory to hard disk 
and will assign them the proper record formats.

Many 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 much 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 of Mars.