IRS-P5立体像对提取DEM及精度评价

DEM Extraction and Accuracy Assessment Based on IRS-P5 Stereo Images

利用IRS-P5同轨立体像对构建DEM并讨论DEM的精度,分析了不同地面控制点组合下的影像定位精度。在至少采用4个地面控制点的情况下,平面和高程方向影像定位精度能够达到2 m的精度。用抽样检查和差值运算的方法对DEM的精度进行了评价,认为P5立体像对生成DEM基本满足国家1∶50 000大比例尺地形图制图的要求。实际选线证明IRS-P5影像生成的DEM满足电力选线的要求。

Experiment was carried out using IRS-P5 stereo images in order to extract DEM and corresponding DEM precision analysis was performed.With at least 4 well-distributed reliable ground control points,planar and vertical orientation accuracy can reach 2 m RMSE separately.Meanwhile this paper proposed two methods to inspect DEM precision,that is,sampling and differencing methods.By these two algorithms,we are convinced that this DEM can meet the geometric requirements of 1∶50 000 large scale maps.Actually,it has proven that this DEM acted as an effective auxiliary tool for power line selection.