On the basis of raster DEM data in the Baohe River basin, this paper presents an application of DEDNM to generate drainage network automatically, build digital basin, and extract drainage network to establish the topological river network structure.

• 本文基于褒河流域栅格数字高程模型DEM(Digital Elevation Model)数据，采用数字高程水系模型DEDNM(Digital Elevation Drainage Network Model)，自动生成河网，构建数字流域，提取流域水系信息，建立流域水系空间拓扑关系。