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Geologic Mapping of Athabasca VallesTwo factors drive us to map the Athabasca Valles area in unusual detail: (1) the extremely well-preserved and exposed surface morphologies and (2) the extensive high resolution imaging. In particular, the near-complete CTX coverage of Athabasca Valles proper and the extensive coverage of its surroundings have been invaluable. The mapping has been done exclusively in ArcGIS, using individual CTX, THEMIS VIS, and MOC frames overlying the THEMIS IR daytime basemap. MOLA shot points and gridded DTMs are also included. It was found that CTX images processed through ISIS are almost always within 300 m of the MOLA derived locations, and usually within tens of meters, with no adjustments to camera pointing. THEMIS VIS images appear to be systematically shifted to the southwest of their correct positions and MOC images are often kilometers off. The good SNR and minimal artifacts make the CTX images vastly more useful than the THEMIS VIS or MOC images. The bulk of the mapping was done at 1:50,000 scale on CTX images. In more complex areas, mapping at 1:24,000 proved necessary. The CTX images were usually simultaneously viewed on a second monitor using the ISIS3 qview program to display the full dynamic range of the CTX data. Where CTX data was not available, mapping was often done at 1:100,000 and most contacts are mapped as approximate.
Document ID
20080041006
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Keszthelyi, L. P.
(Geological Survey Flagstaff, AZ, United States)
Jaeger, W. L.
(Geological Survey Flagstaff, AZ, United States)
Tanaka, K.
(Geological Survey Flagstaff, AZ, United States)
Hare, T.
(Geological Survey Flagstaff, AZ, United States)
Date Acquired
August 24, 2013
Publication Date
June 23, 2008
Publication Information
Publication: Abstracts of the Annual Meeting of Planetary Geologic Mappers, Flagstaff, AZ, 2008
Subject Category
Geophysics
Distribution Limits
Public
Copyright
Public Use Permitted.
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