常用免费DEM数据质量分析
发布时间:2018-03-06 11:36
本文选题:多源DEM 切入点:模拟河网 出处:《南水北调与水利科技》2016年02期 论文类型:期刊论文
【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。
[Abstract]:In this paper, five kinds of DEM data such as HydroSHEDS void-filled demer GDEM are used as the research objects. According to the topographic features of the underlying surface of different basins, different methods of geomorphological characteristics analysis and comparison analysis of real river system and simulated river network are adopted. The quality problem of multi-source DEM data is studied. It is found that the main problem of ASTER GDEM data is that the main problems of ASTER GDEM data are the existence of ambiguity and noise, which will reduce the precision of data and the precision of the extracted simulated river network. But on the whole, the quality of the simulated river network extracted from the three DEM data is equal.
【作者单位】: 河海大学水文水资源学院;国家水安全与水科学协同创新中心;河海大学水资源高效利用与工程安全国家工程研究中心;三峡水利枢纽梯级调度通信中心;
【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)~~
【分类号】:P931.1;P208
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