整个校正过程有两个难点：1如何充分利用各个POS／DG参数准确计算像元地面实际坐标，这涉及到航空摄影测量学的知识；
There are tow problems in the procession of geometric correction: 1 how to compute out each pixel's coordinates by POS/DG parameters precisely; This is in the field of airborne photogrammetry.
传统的摄影测量是从多幅影像上面提取出同名点，然后利用多片前交解算出其对应的空间点坐标。
In the traditional methods of photogrammetry, the same image points picked out from multi-images is used to calculate the corresponding space-coordinates using the multi-image fore-intersection.
作为当今最成熟的工业三坐标摄影测量系统，V - STARS的测量精度一直受到关注。
As the maturest industrial photogrammetry system, V-STARS is attented for its measurement accuracy.
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