Accession Number : AD0768245

Title :   The Mariner 9 Primary Control Net of Mars,

Corporate Author : RAND CORP SANTA MONICA CALIF

Personal Author(s) : Davies,Merton E.

Report Date : APR 1973

Pagination or Media Count : 21

Abstract : A planetwide control net of Mars is being derived photogrammetrically from the television pictures that were returned by Mariner 9. Such a control net is required by cartographers to relate the coordinate system to landmarks and topography. Although the pictures cover the entire Mars surface, there are gaps in the low-resulution coverage. The vidicon camera, which produced the photos used in the control net computations, is a poor instrument for photogrammetric analysis because the electronic distortions are large and the format is small. The coordinate system incorporates a new direction for the spin axis of Mars, a prime meridian defined by a particular crater (Airy-O) on the surface, and a particular reference spheroid for areographic coordinates. The computation of the primary control net is a continuing project; as of April 1973 it contained 1340 control points. (Author)

Descriptors :   (*MARS(PLANET), PHOTOGRAMMETRY), MARS PROBES, MAPPING

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE