介绍了基于数字高程模型(DEM)的流域信息提取方法,包括:DEM预处理,流向及集水面积的确定.水系的生成及子流域的划分方法以及流域面积、长度、坡度、坡向等信息的提取。并将这些方法应用于安徽境内的呈村流域,进行了实例验证,构建了数字化流域。
The methods and procedures based on the digital elevation model (DEM) to extract watershed information were introduced, including pre-processing of DEM, flow-direction computation and determination of catchment area, and extraction of drainage networks, sub-basins, lengths, slopes and aspects. Simultaneously, the Chengcun watershed in Anhui Province was digitized as a case in terms of these extraction methods and procedures.