考虑到同轨道拍摄的长条带卫星影像具有相同的误差分布特性，针对资源三号的标准景影像产品，提出基于轨道约束的卫星影像区域网平差方法。首先，根据同轨相邻影像的偏移量计算轨道影像坐标系下的像点坐标；其次，通过同轨每景影像的RFM重新生成轨道影像的RFM ，同时生成补偿格网；然后，根据基于像方仿射变换的RFM对轨道影像进行区域网平差；最后，利用求得的轨道影像的仿射变换参数重新计算原始单景影像的仿射变换参数。在太行山试验区，相对于单景模式，轨道约束平差在测区四角布控的情况下将平面精度从29．51m提升到26．17m，将高程精度从84．40m提升至30．80m。试验结果证明了轨道平差的有效性和可行性。%Taking into account that long strip satellite images have the same error distribution characteris‐tics ,a block adjustment method is proposed for ZY‐3 satellite standard imagery based on strip constraint . First ,image point coordinate is calcul ated in strip coordinate system according to offset value of the adjacent image .Second ,RFM of strip image is regenerated by RFM of single images ,while generating compensation grid .Third , block adjustment for strip image is implemented based on RFM with affine transformation parameter .Finally ,affine transformation parameters of single images are recalculated by the affine transformation parameters of strip image .In Taihangshan test area ,relative to single image adjustment ,the pl anar accuracy is improved from 2 9.51 m to 2 6.17 m and vertical accuracy is improved from8 .440 m to 3 .080 m by strip image adjustment with 4 GCPs laid in the corners .The test results demonstrate the effectiveness and feasibility of the method .
展开▼
