基于多基线影像匹配的高分辨率遥感影像DEM的自动生成

以青南高原三江源试验区为例,采用SPOT-5 HRS立体影像和HRS/HRG三立体像对生成试验区1∶5万25 m间隔DEM,并利用大量外业和内业检查点对自动提取的DEM进行精度分析。试验结果表明,利用所提出的影像匹配方法可以从SPOT-5卫星影像中全自动生成1∶5万DEM。另外,SPOT-5 HRS/HRG三影像立体条带数据适用于地势起伏较大的深切割山地区域。采用此方法,可以同时保持自动生成的DEM的精度和可靠性,大大减少自动生成的DEM中存在的粗差和人工后处理的工作量。

Automatic DEM Generation from High-Resolution Satellite Imagery Based on Multiple-Baseline Image Matching

An advanced matching approach for automatic digital elevation model(DEM) generation from high-resolution satellite images is presented.The DEMs are generated by combination of matching results of feature points,grid points and edges.The new method is applied to SPOT-5 HRS/HRG images over a testfield in Zone of Headstream of Three Rivers,Tibet Plateau,China with variable terrain geomorphologic type.The RMS errors for the whole area are 2-6 m,while for flat/hilly areas the accuracy is about 2-3 m or even better.It is shown that with the proposed automatic DEM generation approach,by using SPOT-5 HRS/HRG imagery,1∶50 000 DEMs can be completed with better accuracy.