Correlation Analysis of Vegetation Cover and Terrain in Tibetan Plateau

Based on ASTER GDEM with 30 resolutions, Landsat image data and vegetation types, combining with EADAS and Arc GIS 9.3, we processed Tibetan Plateau DEM, and calculated normalized differential vegetation index in this paper. Using the methods of hierarchical classification to analyze the correlation of vegetation coverage and terrain of Tibetan Plateau, the conclusions can be drawn as follows Tibetan Plateau NDVI is highest at the altitude of 4 500 m, however decreased over 5 500 m. Elevation shows negation correlation with elevation. Tibetan Plateau North Slope, northwest slope and the northeast slope of NDVI are higher, however the south slope of NDVI is lower. The sunny slope of NDVI is higher, but the shady slope of NDVI is lower.