Computer Science
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icar...42..159s&link_type=abstract
Icarus, vol. 42, May 1980, p. 159-184.
Computer Science
11
Mars Surface, Radar Imagery, Surface Roughness Effects, Thermal Mapping, Viking Mars Program, Visual Observation, High Resolution, Image Resolution, Lava, Meteorite Craters, Photomapping, Radar Echoes, Rhyolite, Mars, Characteristics, Radar, Thermal Properties, Observations, Surface, Textures, Viking 1 Orbiter, Radar Observations, Comparisons, Features, Volcanoes, Arisa Mons, Maps, Temperatures, Lava, Flow, Photographs, Anomalies, Memnonia Fossae, Eolian Processes, Mantle, Geology, Rheology, Earth-Based Obs
Scientific paper
High-resolution Viking Orbiter images contain significant information on Martian surface roughness at 25- to 100-m lateral scales, while earth-based radar observations of Mars are sensitive to roughness at lateral scales of 1 to 30 m or more. High-rms slopes predicted for the Tharsis-Memnonia-Amazonis volcanic plains from extremely weak radar returns are qualitatively confirmed by the Viking image data. Large-scale, curvilinear ridges on lava flows in the Memnonia Fossae region are interpreted as innate flow morphology caused by compressional foldover of moving lava sheets of possible rhyolite-dacite composition. The presence or absence of a recent mantle of fine-grained eolian material on the volcanic surfaces studied was determined by the visibility of fresh impact craters with diameters less than 50 m. Lava flows with surfaces modified by eolian erosion and deposition occur west-northwest of Apollinaris Patera at the border of the cratered equatorial uplands and southern Elysium Planitia. Nearby yardangs, for which radar observations indicate very high-rms slopes, are similar to terrestrial features of similar origin.
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