基于规则格网DEM的水系提取算法研究

Research of Drainage Network Extraction Algorithms Based on Grid DEM

对DEM提取水系算法,尤其是DEM中洼地和平地的识别和处理、平地水流方向的确定等算法进行了讨论,对于几个基于DEM水系提取算法的实现步骤的分解以及适用性进行了分析。在特定的数据质量情况下,算法研究的结果只能来源于原有数据,而不能超过这个限制去获取信息之外的信息;基于DEM提取水系,尤其是在现有算法所需地貌信息不充分的情况下,还要引入尽可能多的真实地貌信息才能取得比较好的效果。

The algorithm of extracting water system from DEM,especially the algorithm of the recognition and processing of depression and flat ground,determination of flow direction were discussed.The experimental procedure and applicability of algorithm of water system extraction based of DEM were analyzed.The results show that,in the conditions that the data quality is determined,the result of algorithm research can only come from the primary data and can＇t acquire information beyond the restrictions of the primary data;extracting water system based on DEM,especially in the conditions that the existing algorithm needed landform information is not sufficient,must introduce as much as the true landform information to obtain better effect.