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InSAR技术可以获取高精度的沉降场,然而,一方面它与我国使用的坐标系统和投影方式不同,成果之间较难转换;另一方面,由于轨道和大气误差等影响,InSAR结果在地理编码时存在误差。上述两个原因导致InSAR结果在我国不能直接应用于生产实际,限制了InSAR技术的实用化发展。针对这一问题,本文研究一种基于人工角反射器(CR点)的InSAR沉降场与地形图的配准算法。该算法首先通过探测和识别SAR影像上CR点位置,然后对地理编码后的InSAR影像进行校正,最后利用仿射变换对InSAR沉降场进行坐标和投影转换,从而实现与地形图的配准。实验结果表明,该算法精度可靠,原理简单,易于编程实现。
InSAR technology can obtain high precision settlement field. However, on the one hand, it is different from the coordinate system and projection method used in our country, and the results are hard to be converted. On the other hand, When there is error. The above two reasons led to InSAR results can not be directly applied to the actual production in our country, limiting the practical development of InSAR technology. To solve this problem, this paper studies a registration algorithm of InSAR settlement and topographic map based on artificial corner reflector (CR). Firstly, the algorithm detects and recognizes the position of CR point on the SAR image, and then corrects the geocoded InSAR image. Finally, the coordinate and projection transformation of the InSAR settlement field is performed by using the affine transformation, so that the registration with the topographic map can be achieved. Experimental results show that the algorithm is reliable, simple and easy to program.