青海群科某地区工程水文信息提取应用研究OA

The image data of a certain area of Qinghai Qunke was obtained through the drone three-dimensional oblique photogrammetry technology,and the elevation(DEM)data of the area was extracted using DJI Map software.Based on the powerful spatial data analysis and processing capabilities of ArcGIS,the image data was obtained.The three-dimensional visualization tin model of the area,using surface analysis tools to extract and analyze the surface features of the area,such as the aspect,slope,shade and sun slope.Based on the hydrological analysis module in ArcGIS,the area was filled with depressions,flow direction and flow analysis,etc.,and the river network under different threshold conditions was extracted,and the river network characteristics under each threshold condition were analyzed and compared.The comparison between the extracted results and the original regional image map confirms that the surface and hydrological feature information extracted by DEM data is basically consistent with the actual topography and river system features.Therefore,the method of applying DEM to extract hydrological characteristic information of the surface and watershed is feasible and effective.