Physics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2311d&link_type=abstract
Journal of Geophysical Research, vol. 83, May 10, 1978, p. 2311, 2312.
Physics
1
Mars Surface, Planetary Mapping, Planetary Rotation, Radio Tracking, Triangulation, Viking Lander Spacecraft, Contours, Data Acquisition, Radio Occultation, Topography, Viking Mars Program, Mars, Coordinates, Mapping
Scientific paper
The development of planet-wide control nets of Mars is reviewed, and the May 1977 update is described. This updated control net was computed by means of a large single-block analytical triangulation incorporating the new direction of the spin axis and the new rotation rate of Mars, as determined from radio tracking data provided by the Viking lander spacecraft. The analytical triangulation adjusts for planimetric control only (areocentric latitude and longitude) and for the camera orientation angles. Most of the areocentric radii at the control points were interpolated from radio occultation measurements, but a few were determined photogrammetically, and a substantial number were derived from elevation contours on the 1976 USGS topographic series of Mars maps. A value of V, measured from Mars' vernal equinox along the equator to the prime meridian (Airy-0) is presented.
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