With the using of GIS,many topographical distribution characteristics information of Yanwachuan basin which located in typical tableland-gully region can be obtained. This study extracted the contour lines from 1:50 000 topographic map firstly,and utilized Hutchinson s algorithm to create DEM(ANUDEM),from which much surface morphology information such as slope,profile curvature and slope length are extracted,and their characteristic are discussed then. The results showed that 50% of the area concentrated be...
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