Computer Science
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...68..217c&link_type=abstract
Icarus (ISSN 0019-1035), vol. 68, Nov. 1986, p. 217-238.
Computer Science
157
Mars Surface, Planetary Geology, Rocks, Spatial Distribution, Abundance, Albedo, Diurnal Variations, Thematic Mappers (Landsat), Mars, Rock, Distribution, Surface, Mapping, Viking Missions, Abundance, Irtm Instrument, Infrared, Wavelengths, Thermal Properties, Emissions, Spectra, Temperature, Brightness, Radar Methods, Roughness, Dust, Deposits, Inertia, Eolian Processes, Erosion, Deposition, Evolution, Spacecraft Observations, Viking 1 Lander, Viking 2 Landers, Landers, Landing Sites, Arabia Terra, Isidis
Scientific paper
A Viking IR Thematic Mapper observations-based mapping of the spatial distribution of rocks exposed on the planet's surface exhibits a 6-percent areal coverage rock abundance. A model for the determination of rock abundance relates the thermal emission in each of the four Thematic Mapper bands to temperature contrasts in the field of view as well as to nonunit thermal emissivity due to absorption bands in the surface materials and the scattering of the outgoing energy by atmospheric dust and water ice; since each of these produces characteristic spectral and diurnal signatures, they can be readily separated. Dual-polarization radar measurements show the Tharsis volcanic region to be very rough, while thermal measurements indicate few rocks, accompanied by a dust covering. These observations suggest an approximately 1-km thick mantle of fines, overlying a rough subsurface, on which both erosional and depositional aeolian processes have exerted considerable influence.
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