Technology Application |
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KARST DESERTIFICATION INVESTIGATION BASED ON ETM IMAGE?A CASE STUDY OF NANCHUAN CITY |
HUANG yan 1, XIE Shi-you 1,2, ZHAO Ya-ping 1 |
1. College of Geography Science, Southwest University, Chongqing 400715, China; 2. Key Laboratory of Eco-
Environment of Three Gorges Reservoir Region, Ministry of Education, Southwest University, Chongqing 400715, China |
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Abstract With the remote sensing data as the main information source and the geographic information system (GIS)
as the strut, the authors used experience modeling to determine relations between vegetation index and vegetation
coverage degree. In combination with the slope map derived from the topographic map and the pure carbonate, half-
carbonate and non-carbonate areas derived from the regional geologic map and in consideration of the amount of
precipitation as well as the rainfall intensity, a quantitative analytical model based on the expert classifier was
established. With this model, a map of desertification intensity grade of the Nanchuan City was drawn. Field
inspection shows that the Kappa index exceeds the lowest permission distinction precision requirement of 0.7, and
thus a highly effective and practical method is provided for acquiring desertification information.
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Keywords
Remote sensing
Satellite
Radar
High resolution
Application in Oil and gas
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Issue Date: 13 July 2009
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