汉江流域SRTM DEM的水系提取及验证方法

Extracting Hanjiang river network based on SRTM DEM and its validation

针对数字高程模型提取水系问题,以汉江流域为研究区域,利用SRTM DEM作为数据源,运用GIS软件水文分析模块提取研究区域的水系信息,并将其与利用TM影像提取的水系信息进行比较.结果表明:利用SRTM DEM提取的水系信息与实际自然水系信息基本一致,但某些局部区域提取的水系和验证数据存在一定偏差.

Extracting river network based on digital elevation model （DEM） is one of the hotspots in digital hydrology research. Taking Hanjiang Basin as a case, this paper aims at the methods of extracting river network based on SRTM （Shuttle Radar Topography Mission） DEM and hydrologic analysis module of a specific GIS platform. Extracted river network were compared with the one derived from Landsat TM image. The results show that SRTM DEM can offer river network information consistent with the reality generally. However, there are some differences between the extracted network and validation data in part of the study area.