常用免费DEM数据质量分析  

Analysis of the suitability of commonly used DEM data

作　　者：黄平[1] 张行南[1,2,3] 徐涛[4] 郭乐[4] 王祥[4] 

机构地区：[1]河海大学水文水资源学院,南京210098 [2]国家水安全与水科学协同创新中心,南京210098 [3]河海大学水资源高效利用与工程安全国家工程研究中心,南京210098 [4]三峡水利枢纽梯级调度通信中心,湖北宜昌443133

出　　处：《南水北调与水利科技》2016年第2期75-81,共7页South-to-North Water Transfers and Water Science & Technology

基　　金：水利部公益性行业科研专项项目(201401034);国家自然科学基金重点项目(41030636;51420105014)~~

摘　　要：以常用HydroSHEDS void-filled DEM、SRTM、ASTER GDEM等五种DEM数据为研究对象,针对不同流域下垫面地貌形态,采用不同的地貌特征分析方法以及将流域真实水系和模拟河网对比分析等方法,研究了多源DEM数据的质量问题。研究发现ASTER GDEM数据主要问题是噪声大,HydroSHEDS void-filled DEM和SRTM数据的主要问题是存在模糊,噪声、模糊均会降低数据的精度和提取的模拟河网的精度,但从整体上来看,三种DEM数据提取的模拟河网的质量相当。This paper selected five different sources of DEM data：HydroSHEDS void-filled DEM,SRTM and ASTER GDEM and so on to analyze the quality of different DEM data under different geomorphologic shapes by choosing different geomorphological characteristics analysis methods and comparing the simulated drainage networks with the real drainage networks.The results showed that the main problems of ASTER GDEM DEM data was data noise and of the other two DEM data both had some fuzzy data.These data quality issues would all affect the accuracy of the data and the river network extracted from them.In general,the accuracy of these digital drainage networks extracted from the three DEM data all had high precision.

关 键 词：多源DEM 模拟河网 水平分辨率 地貌分类 噪声 模糊 

分 类 号：P231[天文地球—摄影测量与遥感]