The adopted data source is DEM, which is downloaded from Geospatial Data Cloud (http://www.gscloud.cn/search), splicing multiple DEMs, cropping DEMs using vector boundaries of the Weihe River Basin, and finally obtaining DEM data of the Weihe River Basin. The hydrological analysis can determine the river direction, extract the river network, classify the river network, and extract the watershed, which mainly includes the following five parts:
1. Depression-free DEM generation: (1) water flow direction extraction; (2) depression depth calculation; (3) depression filling.
2. Confluence Accumulation Calculation: (1) Recalculate the direction of flow in the undepressed DEM; (2) Calculate the Confluence Accumulation.
3. Flow length calculations: (1) DOWNSTREAM-calculates the downslope distance along the flow path from each image to the sink or outlet on the edge of the raster; (2) UPSTREAM-calculates the longest upslope distance along the flow path from each image to the top of the watershed.
4. River network extraction: (1) River network generation; (2) Stream link generation (connection points of the river network, including the start and end points of arc segments); (3) River network hierarchy generation.
5. Basin segmentation: (1) identification of basin basins; (2) identification of catchment outlets; and (3) generation of catchment basins.
Raw DEM data downloaded from Geospatial Data Cloud (http://www.gscloud.cn/search).
1. The data source used for the data was DEM, which was downloaded from Geospatial Data Cloud (http://www.gscloud.cn/search). Multiple DEMs were spliced, and the DEMs were cropped using the vector boundaries of the Weihe River Basin to finally obtain the DEM data of the Weihe River Basin.
&Emsp; 2. Using ArcGIS software, apply hydrologic analysis tools to extract factors such as river network, flow direction, flow, catchment accumulation and stream length.
Data quality is good.
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CSTR:11738.11.ncdc.WRiver.2021.3
10.12072/ncdc.WRiver.db0003.2021