Physics – Geophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..506w&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 506-507 (SEE N92-10728 01-91)
Physics
Geophysics
Digital Data, Elevation, Mars Surface, Mathematical Models, Mercator Projection, Relief Maps, Sine Waves, Terrain Analysis, Topography, Frequency Distribution, Planetary Geology
Scientific paper
A Digital Terrain Model (DTM) of Mars was derived with both Mercator and Sinusoidal Equal-Area projections from the global topographic map of Mars (scale 1:15 million, contour interval 1 km). Elevations on the map are referred to Mars' topographic datum that is defined by the gravity field at a 6.1-millibar pressure surface with respect to the center of mass of Mars. The DTM has a resolution at the equator of 1/59.226 degrees (exactly 1 km) per pixel. By using the DTM, the volumetric distribution of Mars topography above and below the datum has previously been calculated. Three types of elevation distributions of Mars' topography were calculated from the same DTM: (1) the frequency distribution of elevations at the pixel resolution; (2) average elevations in increments of 6 degrees in both longitude and latitude; and (3) average elevations in 36 separate blocks, each covering 30 degrees of latitude and 60 degrees of longitude.
Ablin Karyn K.
Howington-Kraus Annie E.
Wu Sherman S. C.
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