基于不同DEM数据源的流域特征信息提取对比——以重庆市大宁河流域为例

Extraction Comparison of Watershed Characteristics Based on Different DEM——An Application Case in Chongqing Daning River

文章介绍了流域河网特征的传统获取方式以及最近十年发展起来的遥感地形测绘,比较了ASTER GDEM(先进星载热发射和反射辐射仪全球数字高程模型)与SRTM(航天飞机雷达地形测绘任务)的发展由来与数据基本情况,同时论述了基于地表径流模型提取流域的方法。选取重庆市大宁河流域做不同DEM数据源的流域特征信息提取对比,研究表明ASTER GDEM提取流域河网特征精度高于SRTM。

The paper introduced the traditional extraction method of the basin network of watershed characteristic and the remote sensing terrain mapping which developed in the recent decade,compared the development and the basic data of ASTER GDEM with that of SRTM,elaborated extraction method based on the surface runoff model.Through comparing the basic characteristic information about Chongqing Daning River＇s different DEM date resouces from ASTER GDEM and SRTM,the study shows that the precison of ASTER GDEM is higher than that of SRTM.