subcatchment extracting 子流域提取
By means of GIS method, the digital elevation model(DEM)is established, the subcatchment boundaries are studied.
利用 GIS 方法建立了数字高程模型（DEM），研究了子汇水面积的边界。
By means of GIS method, the digital elevation model(DEM)is established, the flow direction, flow accumulation, subcatchment boundaries and stream network spatial distribution are studied.
采用GIS的方法，建立了环县数字高程模型（DEM），研究了本区地表水流方向、集流能力、子集水区的划分及水系网络空间分布等水文特征。
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