基于ERDAS的SPOT5卫星影像正射校正方法研究

海岛海岸带卫星遥感调查与评价项目以高分辨率卫星遥感影像数据为基础。项目区块地形有一半为山地和丘陵，地形起伏较大，常规的几何校正难以消除因地形起伏引起的影像几何变形，必须进行正射校正。根据现有数据特点和项目要求，提出了可行的正射校正流程，基于SPOT5物理模型对融合影像进行正射校正，实验校正结果完全满足精度要求。

Research on Orthorectification Method of SPOT5 Satellite Image Based on ERDAS

The project of island and coastal zone satellite remote sensing investigation and evaluation is based on high-resolution remote sensing image data.The terrain in half of the project is mountain and hill,and hypsography is distinct,so the geometric distortion caused by hypsography is difficult to eliminate using conventional geometric correction,and then orthorectification is needed.According to the project requirement and the characteristic of the current data,feasible flow of orthorectification is put forward.The matching points from the national basic maps with Xi'an80 and WGS 84 coordinate system are used to compute seven-parameter.The coordinate system conversion from Xi'an80 to WGS 84 is realized by the functions extension of ERDAS IMAGINE 9.1.It is rapid and accurate for Autosync to match images and the fused images are orthorectifyed based on the physics model of SPOT5.The experiment result satisfies the request of accuracy.