利用IRS-P5卫星影像生成DEM和DOM试验及精度评价

DEM and DOM Generation Experiment and Accuracy Assessment Based on IRS-P5Stereo Images

以内蒙古大青山地区的IRS-P5全色立体像对为例,从已有的大比例尺地形图上选取控制点,利用PixelGrid软件生成5m格网间距的DEM和2.5m分辨率的DOM。用检查点法对DEM、DOM的精度进行评价,认为IRS-P5立体像对生成的DEM满足国家1∶50000地形图制图要求,高程精度能达到1∶10000地形图山地和高山地测图中误差要求,DOM平面精度符合1∶10000地形图精度要求,在活动断裂定量地貌研究中具有广泛的应用前景。

Taking the IRS-P5 stereo images of Daqingshan area as an example,this research obtained the DEM and DOM products with the resolution of 2.0m and 2.5m respectively,based on the GCPs extracted from existing large scale topographic maps.The PixelGrid software was utilized.Point-checking method was introduced to inspect accuracy of the DEM and DOM. The result indicates that DEM product extracted from IRS-P5 stereo images meets accuracy of 1∶50000 topographic mapping in China.The vertical accuracy of the DEM can satisfy 1∶10000 topographic mapping in hilly area and mountainous region,while the horizontal accuracy of DOM can meet 1∶10000 topographic mapping.Both DEM and DOM extracted from IRS-P5 stereo images will have widely application prospect in quantitative research of morphotectonics and active tectonics.