DEM数据在黄土高原典型地貌区的误差分布

Error distribution analysis of SRTM3DEM V4 data in the typical geomorphologic area of Loess Plateau

针对SRTM3DEM数据的误差研究在黄土高原比较薄弱的问题,该文采用基于1:5 000地形图生成精确DEM数据的方法,对最新版的SRTM3DEM V4数据在黄土高原典型地貌区的误差分布进行了研究;并对研究区内典型黄土地貌类型(黄土塬、黄土梁和黄土峁)的误差分布进行了分析,从而获取SRTM3DEM V4数据在黄土高原地区的误差分布规律。研究结果表明:SRTM3DEM V4数据误差较大,且与坡度分布密切相关;黄土塬与黄土梁的误差相似,它们均与黄土峁有明显差异。研究结果对基于SRTM DEM数据的数字地形分析与相关地学研究具有一定意义。

Aiming at the problem of deficient research on the error of the SRTM3 DEM in the Loess Plateau,this research acquired accurate DEM data based on the topographic maps at 1∶5 000 scales,and studied the error distribution of the newly published SRTM3 DEM V4data in the typical geomorphologic area;meanwhile,it analyzed the error distribution of the typical loess geomorphologic types（loess tableland,loess ridge and loess knoll）,so as to achieve the error distribution characteristics of the SRTM3 DEM V4data in the Loess Plateau.The research results showed that the error was a little high,which had close relationship to the slope distribution;the error values for the loess tableland and loess ridge were similar,but they both had sharp distinction with that of the loess knoll;the research results were significant for the digital topographic analysis and related geographic research based on SRTM DEM data.