Pléiades卫星影像正射处理中像控点布设方案研究

Research on Image Control Point Layout Program in Pléiades Satellite Images Ortho Processing

为测试Pléiades(普莱亚)卫星影像正射处理中采用不同像控点布设方案校正后的精度,以粤东区域一景Pléiades 1A级产品全色影像为例,利用现场采集的28个地面控制点和1∶10 000的DEM产品,采用了2×2、2×2+1、3×2、4×2、3×3、4×4这6种像控点布设方案进行正射校正测试,并对成图精度进行了分析。结果表明,精度最高、最低的中误差分别为0.61个像素、1.94个像素,各种实验方案的检查点残差各向异性,未见系统性差异,且这几种像控点布设方案得到的正射影像均能满足1∶5 000成图精度要求。按照现行质量评定标准,想要达到优质产品质量要求,单景至少需要6个像控点方可满足要求,综合考虑生产成本的投入,确定最佳布设方案为9个点。同时采用了广州城区一景数据对上述实验情况进行了检核,结果与测试结果相当。将该结果用于广东地区约95 000 km2正射影像生产,最终检测结果也与测试结果一致,证明了测试结果可靠,具有一定的推广价值。

To test the rectified accuracy of different image control point layout programs in Pléiades satellite images ortho processing, taking a scene Pléiades 1A level products panchromatic images in the eastern region for example, using 28 ground control points collected in the field and 1 ∶ 10 000 DEM products, this paper used 2×2, 2×2+1, 3×2, 4×2, 3×3 and 4 × 4 layout programs to test ortho rectified, and analyzed the accuracy of mapping. The results show that the highest and lowest accuracy of error are 0.61 pixels and 1.94 pixels. The residuals of various test programs are anisotropy, no systematic differences. These types of control points obtained orthophoto maps can meet the 1 ∶ 5 000 accuracy requirements.