Stereo topography of Valhalla and Gilgamesh

Details Stereo topography of Valhalla and Gilgamesh Stereo topography of Valhalla and Gilgamesh

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1249s&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 249.

Physics

1

Icy Satellites, Callisto, Topography, Ganymede, Planetary Geology, Hypervelocity Impact, Planetary Structure, Satellite Imagery, Planetary Rings

Scientific paper

The geology and morphology of the large multiring impact structures Valhalla and Gilgamesh have been used to infer ways in which the interior structure and properties of the large icy satellites Callisto and Ganymede differ from rocky bodies. These earlier studies were made in the absence of topographic data showing the depths of large impact basins and the degree to which relief has been preserved at large and small scales. Using Voyager stereo images of these basins, we have constructed the first detailed topographic maps of these large basins. These maps reveal the absence of deep topographic depressions, but show that multi-kilometer relief is preserved near the center of Valhalla. Digital Elevation Models (DEM) of these basins were produced using an automated digital stereogrammetry program developed at LPI for use with Voyager and Viking images. The Voyager images used here were obtained from distances of 80,000 to 125,000 km. As a result, the formal vertical resolution for both Valhalla and Gilgamesh maps is about 0.5 km. Relative elevations only are mapped as no global topographic datum exists for the Galilean satellites. In addition, the stereo image models were used to remap the geology and structure of these multiring basins in detail.

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