The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vo/. XXXVII. Part B7. Beijing 2008 
FIGURE CAPTIONS 
1 4850m 
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2000m 
^1000m 
Figure 1 The DEM (digital elevation model) map of the Qianlian Mountain area with the spatial resolution of 100 m. The area 
surrounded by watershed of Heihe tributaries in east and west boundary (outlined with bold black line) was selected as the study area. 
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0.56 
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Aspect (°) 
Figure 2 The change of the mean NDVI values with elevation and aspect in the northern part of Qilian Mountain. A Gaussian smooth 
filter was used and a low pass convolution was performed on the grid data to present a more consistent and smooth map. Note: a 
refiner scale (0.02) was used when the NDVI value is larger than 0.5.