Abstract
Abstract. Karst rocky desertification is a typical type of land degradation in Guizhou Province, China. It causes great ecological and economical implications to the local people. This paper utilized the declassified intelligence satellite photography (DISP) of 1960s to extract the karst rocky desertification area to analyze the early situation of karst rocky desertification in Liupanshui, Guizhou, China. Due to the lack of ground control points and parameters of the satellite, a polynomial orthographic correction model with considering altitude difference correction is proposed for orthorectification of DISP imagery. With the proposed model, the 96 DISP images from four missions are orthorectified. The images are assembled into a seamless image map of the karst area of Guizhou, China. The assembled image map is produced to thematic map of karst rocky desertification by visual interpretation in Liupanshui city. With the assembled image map, extraction of rocky desertification is conducted.
Highlights
Karst rocky desertification has become an important topic to prevent soil erosion, restore vegetation, and pull farmers out of poverty in the karst areas of Southwestern China
The use of declassified intelligence satellite photography (DISP) image to draw a typical karst terrain of Guizhou rocky desertification distribution map is of great significance for scientific research on the history of rocky desertification change and development characteristics
This paper uses the declassified intelligence satellite photographs image (DISP) from the US Geological Survey Website as the basic image to study the karst region of Guizhou Province in the 1960s
Summary
Karst rocky desertification has become an important topic to prevent soil erosion, restore vegetation, and pull farmers out of poverty in the karst areas of Southwestern China. Guizhou Province has the largest desertification area, suffering the most homogeneous, the deepest and the most serious from rocky desertification (Zhao, 2011). The rocky desertification area in Guizhou covers 37597.36 km, accounting for 21.34% of the entire land area of Guizhou Province, approximately 34.47% of the total area of karst of China. The use of DISP image to draw a typical karst terrain of Guizhou rocky desertification distribution map is of great significance for scientific research on the history of rocky desertification change and development characteristics
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