ARTICLE NO. IS985967 The Local Topography of Uruk Sulcus and Galileo Regio Obtained from Stereo Images
Galilean satellite. To support the geologic analysis topo-graphic data of high resolution are needed. However, suchHigh resolution (,100 m/pixel) stereo images obtained by data has not been available from the Voyager missions.the Galileo SSI camera are analyzed using photogrammetric techniques to de...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
1997
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.651.2933 http://planetary.brown.edu/pdfs/2030.pdf |
| Summary: | Galilean satellite. To support the geologic analysis topo-graphic data of high resolution are needed. However, suchHigh resolution (,100 m/pixel) stereo images obtained by data has not been available from the Voyager missions.the Galileo SSI camera are analyzed using photogrammetric techniques to derive local Digital Terrain Models (DTMs) of Low-resolution (p600 m/pixel) topographic profiles Ganymede’s surface. The models cover areas of 22 3 56 km near the south pole of Ganymede were derived from Voy-in Uruk Sulcus and 63 3 102 km in Galileo Regio and have ager images using photoclinometric (shape-from-shading) spatial resolutions of 500 m/pixel and 1000 m/pixel, respec- techniques (Squyres 1981). More recently, this technique tively. For Uruk Sulcus, the DTM features a wave-like topogra- was used to study the morphology of craters (Schenk 1991) phy with wavelengths of 2–6 km and amplitudes of up to 500 m. and volcanic features (Schenk and Moore 1995). Photocli-Individual topographic highs show asymmetric shapes with nometry requires that surface albedo be constant alongslopes of up to 208 and terracing. The terrain model in Galileo these profiles and that changes in surface brightness beRegio has isolated knobs, furrows of up to 10 km in width, and due to photometric shading effects only. Thus, the analysesridges of up to 1 km in height. Surface roughness in Galileo were restricted to areas in which these assumptions wereRegio at DTM scales is markedly higher than in Uruk Sulcus. believed to hold. To overcome these limitations, SchenkBowl-shaped craters are identified in the models with depth to |
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