Heng ling Huang, Qun yong Wu
DEM-based drainage extraction is a hot spot in digital hydrology research. This paper has analyzed the method of drainage extraction based on DEM, used Hydrology tools in ArcGIS software to build the model of drainage extraction and published the model to geoprocessing service. Taking Jiulong River basin DEM as an example, this paper used geoprocessing service to realize drainage automatic extraction in the network environment. The comparison of GP-based drainage extraction and actual drainage system shows that using this GP-based drainage extraction method to extract Jiulong river basin in general can objectively reflect its space distribution .