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Proceedings Paper

Potentials and limitations of coupling ASTER and airborne geophysical data for improvement of geological mapping in arid region (Namibia, Rehoboth region)
Author(s): Cecile Gomez; Christophe Delacourt; Pascal Allemand; Patrick Ledru
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Paper Abstract

The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) launched on NASA’s Terra satellite ranks lately among potential tools for Earth Observation. ASTER measures reflected radiations in 3 bands between 0.52 to 0.86 μm (VNIR) and in 6 bands between 1.6 to 2.43 μm (SWIR). An ASTER image has been acquired on the Southern margin of the Damara orogen (Namibia, northern margin of the Nama marine sedimentary sequence) essentially composed by limestone, sandstone and shale. Furthermore, a program initiated by the Geological Survey of Namibia has permitted to obtain a radiometric data set (Thorium, Uranium and Potassium) of Rehoboth region in Namibia. The combined ASTER and airborne geophysical data have been processed and interpreted for improving the existing geological map. First, a Principal Component Analysis (PCA) on the 9 ASTER bands is realized and only the first five components are kept. Then, the Maximum Likelihood approach is used to identify lithological formations from radiometric data and PCA components. Importance of random training data has been pointed out. Finally the coupling of ASTER and radiometric data is the best approach for the improvement of geological map with a proportion of correctly mapped surface of 63.4% from initial geological map.

Paper Details

Date Published: 13 February 2004
PDF: 11 pages
Proc. SPIE 5239, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology III, (13 February 2004); doi: 10.1117/12.510492
Show Author Affiliations
Cecile Gomez, Univ. Claude Bernard Lyon 1 (France)
Christophe Delacourt, Univ. Claude Bernard Lyon 1 (France)
Pascal Allemand, Univ. Claude Bernard Lyon 1 (France)
Patrick Ledru, Bureau de Recherche Geologique et Miniere (France)

Published in SPIE Proceedings Vol. 5239:
Remote Sensing for Environmental Monitoring, GIS Applications, and Geology III
Manfred Ehlers; Hermann J. Kaufmann; Ulrich Michel, Editor(s)

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