一个基于DEM的数字河网体系提取算法的应用  

An Extraction Algorithm of Digital Drainage Network from Digital Elevation Model

作　　者：崔青春[1] 吴孟泉[1] 孔祥生[1] 张丽[1] 

机构地区：[1]鲁东大学地理与规划学院,山东烟台264025

出　　处：《计算机技术与发展》2011年第6期204-207,共4页Computer Technology and Development

基　　金：国家科技重大专项子课题(2008ZX07207-01);山东省自然科学基金项目(ZR2009EM005)

摘　　要：基于DEM提取数字河网是一种高效率获取河网信息的方法,D8算法由于直观简单,成为数字河网提取中应用最为广泛的模型之一。介绍了D8算法模型的基本原理、计算步骤以及流域水系提取阈值设定等问题,并采用这一模型对烟台市大沽夹河网DEM数据进行数字河网体系的提取,对提取的数字河网体系进行了检验。研究结果表明,在算法中不同的流域应取不同的阈值,所取阈值的范围对提取出的河网密度、精细度等有着巨大的影响。最后,指出这个算法所存在的缺点。It is a highly efficient method to acquire the information of stream network from DEM by using the arithmetic of D8,which is one of the most widely used models in extracting digital network.The paper has introduced the basic principle and calculated steps of the arithmetic model of D8,it also has included some questions about threshold setting of extracting drainage network.This article has simulated the Dagujia River network of Yantai city by using this model,and compared it with the actual river network.The results show that the algorithm in different basins should take a different threshold.The scope of the threshold affect the density and precision of the extracted network widely.Finally,the existing shortcomings of algorithms have been pointed out.

关 键 词：DEM 数字河网体系 D8算法 

分 类 号：TP31[自动化与计算机技术—计算机软件与理论]