一种改进的DEM数字水系简易提取方法研究A DEM based-improved simple method for extraction of digital water system
曾向辉,曲树国,冯杰
摘要(Abstract)：
利用DEM提取数字水系的过程分为填洼、流向计算、汇流累积量计算和设定阈值提取水系,其中以填洼和计算各单元的汇流累积量最为费时。相比与Jenson和Domingue(J&D)、Planchon和Darboux(M&V)填洼算法,L.Wang和H.Liu(W&L)填洼算法具有原理简单、运行速度快等特点。但是,W&L算法未对平区高程进行修正,增加了后续相关算法的复杂度。本文通过将J&D和M&V算法中的微小高程增量引入W&L算法,建立改进的W&L算法,可以有效地解决该问题。在汇流累积量的计算过程中,受W&L填洼算法思想的影响,构建了逆向W&L汇流累积量算法,该算法一改传统的流向追踪思想,通过对填洼后DEM进行升序排序,可逐步对每一栅格进行计算。该算法原理简单,易于实现,对单流向和多流向方法均具有很强的适应性。利用SRTM、GDEM源数据进行了示例计算,并将结果与ARC/INFO软件结果进行了对比,结果表明该方法合理、准确。
关键词(KeyWords)： 数字高程模型;洼地;填洼;数字水系;优先队列
基金项目(Foundation): 国家自然科学基金项目(50609005)
作者(Author): 曾向辉,曲树国,冯杰
DOI: 10.13928/j.cnki.wrahe.2015.03.004
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