%0 Dataset
%T Data set of hydrological factors in Weihe River Basin
%J National Cryosphere Desert Data Center
%I National Cryosphere Desert Data Center(www.ncdc.ac.cn)
%U http://www.ncdc.ac.cn/portal/metadata/40e2ab9b-3674-4b66-848d-3c975a1bc778
%W NCDC
%R 10.12072/ncdc.WRiver.db0003.2021
%A Zhang yaonan
%K Depression free DEM;confluence accumulation;flow length;river network extraction;watershed segmentation
%X The data source used for the data is DEM, which is from geospatial data cloud（ http://www.gscloud.cn/search ）Download, splice multiple Dems, cut the DEM using the vector boundary of Weihe River Basin, and finally get the DEM data of Weihe River Basin. Through hydrological analysis, the river direction, river network extraction, river network classification and watershed extraction can be determined, mainly including the following five parts: 1. No depression DEM generation: (1) flow direction extraction; (2) Calculation of depression depth; (3) Depression filling. 2. Calculation of confluence accumulation: (1) recalculate the flow direction of DEM without depression; (2) Calculate the confluence accumulation. 3. Calculation of flow length: (1) downstream - calculate the downhill distance from each pixel along the flow path to the sink or outlet on the grid edge; (2) Upstream - calculates the longest uphill distance along the flow path from each pixel to the top of the watershed. 4. River network extraction: (1) river network generation; (2) Stream link generation (the connection point of the river network, including the start point and end point of the arc segment); (3) Hierarchical generation of river network. 5. Watershed segmentation: (1) determination of watershed basin; (2) Determination of water outlet in catchment area; (3) Generation of catchment basins