The Use of Topographic Sketch Method in the Region of Loess Hilly Ravine Land
地形描绘方法在黄土丘陵沟壑地区的应用

This paper describes experiments of the use of topographic sketch method in the region of Sanchuan river basin, Shanxi province, this basin is a region of loess hilly ravine land. Better results can be obtained when following choices are employed: using the discrete cosine transformation facet; smaller window size; DEM from better resolution data.The experiment shows that the topographic sketch method is practicable for extraction of ravine network or basin network from DEM and able to use it for geographic information system.