摘要
在大范围的平坦区域提取水系网时往往存在一定误差,在中、低分辨率的DEM中提取水系网时尤为明显。本文针对这一情况,分别对基于传统提取水系网方法、基于数据结构原理、基于数学概率的多种改进方法进行分类研究,详细论述分类后各方法在提取水系网时的优点,以期对以后的研究提供参考。
In the large and flat area, there are some errors when the drainage networks are extracted and especially obvious in the middle and low resolution of the discrete element method （DEM）. In view of this situation, this paper sorts some methods and studies various improved methods respectively based on the traditional methods of drainage networks, the theory of data structures and the mathematical probability. Then it discusses the advantages of the extraction methods of drainage networks in detail, in order to provide powerful reference for future research.
