CCSD3ZF0000100000001NJPL3IF0PDS200000001 = SFDU_LABEL RECORD_TYPE = STREAM PRODUCT_CREATION_TIME = 2001-02-08 OBJECT = TEXT NOTE = "Introduction to this CD volume." END_OBJECT = TEXT END Mission to Mars Mars Mosaicked Digital Image Model (MDIM) This compact write-once optical disk (CD-WO) is one of a series of six CD 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. These CD volumes supersede and replace the first six volumes of a set of CD-ROMs released in 1991 containing an earlier version of the mosaic. Volume 7 of the previously released CD-ROM dataset contained planet wide coverage of MDIMs and Digital Terrain Models (DTMs) at 1/64 and 1/16 degrees/pixel. Volume 7 is not planned or intended as part of this version 2 release. However, the DTMs on Volume 7 have been superseded by data from the Mars Orbiter Laser Altimeter (MOLA) instrument of the Mars Global Surveyor spacecraft. A MOLA global DTM will be released separately from this set of disks. This file is one of only a few files located in the main directory. Another file, VOLDESC.SFD, contains a description of the contents of this CD volume in a format that is designed for access by computers. 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. 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 regarding each image in this CD collection. The index tables are text files presented 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. 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 Mars Data Analysis Program at NASA headquarters, Washington, DC, and through the Mars Exploration Directorate administered by the Jet Propulsion Laboratory, Pasadena, California. NASA's Planetary Data System provided the guidance and standards for the design of the disks. Compilation of the Mars digital models was performed at USGS under the direction of R.L. Kirk and L.A. Soderblom, Principal Investigator and Co-Investigator, respectively. E.M. Lee provided the technical management and supervision of a team of technicians consisting of B. Sucharski, A. Grecu, J. Richie, L. Weller, A. Gitlin, and S. Castro that compiled the MDIM. Software support was provided by K.T. Thompson and D. Cook for photometric/cosmetic processing of the images, and by L. Weller and K. Becker for formatting of the data for distribution. Geodetic control for the mosaics was computed by M.E. Davies and T. Colvin at RAND, based on image measurement data supplied by the USGS. The original CD-ROM series released in 1991 was designed by E.M. Eliason and A. Manley at the USGS, and M. Martin and J. Hyon at the Jet Propulsion Laboratory. The design of the current series was based on the earlier design, with minor modifications. E.M. Eliason and C. Isbell provided information and assistance regarding PDS archive and standards issues. Creation and duplication of the CDs were carried out by L. Weller and C. Isbell of USGS, respectively.