基于DEM的新疆开都河流域河网提取研究

随着水文与3S技术的不断融合,大多数地形信息存储在数字高程模型(DEM)中,可以自动化的提取流域水系信息参数.利用ArcGIS中的水文分析工具Arc Hydro Tools对开都河流域分辨率为1∶25万DEM进行研究.结果表明,采用不同阈值提取开都河流域河网时,主河道的空间位置基本不变,但是河网密度发生明显变化.通过与实际河网的对比,确定当阈值为17 000时,有较好的吻合度.

DEM-Based Extraction of River Network of the Kaidu River Basin in Xinjiang

With the integration of hydrology and 3S technology,most of terrain information is stored in the digital elevation model （DEM）, from which parameters of drainage networks can be automatically re- trieved. Arc Hydro Tools,a hydrological analysis tool in ArcGIS, was used to study 1：25 million DEM of the Kaidu River Basin. The result shows that,when different thresholds are used to extract the Kaidu River Basin network, the spatial position of the main river remains basically unchanged, but the drainage density apparently changes, and that, compared with the actual network, the goodness of fit is higher when the threshold is 17 000.