不同分辨率SRTM-DEM的数字地形分析比较研究

Comparative Research of Digital Terrain Analysis Based on Different Resolution SRTM-DEM

以通化地区为试验区,利用Arc/Info软件,将原始的SRTM数据生成等高线,再插值生成不同分辨率的DEM数据,提取了高程差、坡度、坡向、地形阴影数字地形信息,并根据D8算法,对流域信息进行提取。结果表明:不同分辨率的DEM在描述地形的整体变化上存在的差异很小,但高分辨率的DEM可以更好地反映出地形的细微变化;在水文模拟方面,流域网络的数量及沟壑密度与DEM的分辨率成正相关的关系,但由于高分辨率的DEM信息冗余,在水文模拟方面,提取流域网络的时候会出现生成伪沟谷的现象。

This paper selected Tonghua city as test area,using Arc/Info software to generate contour lines by using original SRTM data and produce different resolution DEM by interpolation,and extracting the height difference,slope,aspect,terrain shadow,and in accordance with D8 algorithm,extracting basin information.The results shows there are little differences in total change of different resolution DEM in describing the topography,but the high-resolution DEM can better reflect subtle changes in terrain;In aspect of hydrological simulation,basin network number,gully density and the resolution of DEM with a positive relationship,but there will be a phenomenon of generating pseudo-valley when extracting basin network because of information redundancy of high-resolution DEM.