The landscape-unit approach applied to geology, on SPOT images, in temperate climate zones using a test-area in the Cévennes (Massif Central, France) |
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| Authors: | Jean-Paul Deroin Jean Chorowicz Thierry Deroin Phillippe Dutarte Jean-Yves Scanvic Andr Simonin |
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| Institution: | Jean-Paul Deroin, Jean Chorowicz, Thierry Deroin, Phillippe Dutarte, Jean-Yves Scanvic,André Simonin |
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| Abstract: | Classification image processing is based mainly upon spectral features but this information alone is inadequate for drawing comprehensive maps or reliably distinguishing lithological or structural targets, especially in vegetation-covered areas. It is therefore of interest to explore an approach in which subtle features of the image are matched with field data in a variety of parameters either measured or assessed qualitatively. This approach is necessarily multidisciplinary, the three basic aspects being geomorphological, botanical and geological.The Cévennes massif, in southern France, with its sedimentary margins was selected as a test area, having both varied geology, giving a variety of landscapes, and a range of climatic zones, from Mediterranean to sub-Alpine.The present work is distinguished by its use of the landscape unit, which is rarely considered in geology. Landscapes units are recognized and defined, and the spectral homogeneity of the units is then assessed. They are combined with satellite and other data in order to improve the digital processing for geological purposes.The parameters characterising each landscape unit define the various elements contributing to the landscape, the most important of which are morphology, vegetation and geology, and their interactions. Our results using these parameters show the interest of the management of both the satellite (SPOT in this case) and non-satellite (exogenous) data. |
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