【摘要】 数字高程模型(DEM)中的闭合洼地和平坦区域影响着流域排水网络的自动提取。目前已提出很多方法来处理这两种地形,但均针对已经形成的DEM单元网格进行处理,结果往往生成伪河道及平行河道。在回顾分析了这些方法存在的问题后,提出了一种新的处理方法,该法认为DEM中的闭合洼地和平坦区域是由于低质量的资料输入、生成DEM时的内插误差等引起的。通过增加输入地形高程信息,避免了DEM中平坦区域和闭合洼地的生成,从而使由DEM生成的河网与实际河网能够精确拟合。实例分析表明,该方法效果明显。更多还原

【Abstract】 The automatic detection of drainage networks from digital elevation the models (DEM) is affected by flat areas and closed depressionsA variety of methods have been proposed to treat these two features, but the flat areas and closed depressions are processed only after they have been created,so as to generate many spurious and parallel drainage courses a new algorithm for treating the flat areas and closed depressions is proposed in the paper. It is known that the flat areas and closed depressions often arisen because of low quality input data, interpolation errors during the DEM generation et alTherefore, they can be removed by adding elevation information to input topographic data The proposed approach can lead to better match between observed and modeled flow structure and produce more realistic results in application更多还原