Mathematics – Logic
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990em%26p...50..305s&link_type=abstract
Earth, Moon, and Planets (ISSN 0167-9295), vol. 50-51, July-Dec. 1990, p. 305-327. Research supported by the William F. Marlar F
Mathematics
Logic
19
Pioneer Venus Spacecraft, Planetary Geology, Planetary Mapping, Radar Imagery, Radar Maps, Venus Surface, High Resolution, Radar Cross Sections, Venera Satellites
Scientific paper
The data collected by Pioneer Venus have been used to map the broad radar characteristics of the equatorial region on the basis of radar brightness and texture. Seven units are defined and are used to assess the geologic character of the equatorial region. The correspondence between features in the 15 deg region of overlap between Pioneer Venus ans Venera 15/16 images is examined and used to extend units mapped in the northern high latitudes into the equatorial region. Using the properties of rms slope, reflectivity, the scattering behavior of the surface, and topographic signature, seven physiographic units are mapped on the basis of the distribution of the radar units in the equatorial region and are identified by increasing complexity as plains, dark halo plains, upland rises, upland plateaus, interhighland tectonic zones, tectonically segmented linear highlands, and tectonic junctions. The distribution of larger circular structures interpreted as coronae is also examined.
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