为了鉴定陆地卫星5号系统纠正TM图像产品的精度,我们以1:5万地形图为基准,对四景TM图像作了精度分析。结果表明,系统纠正后的TM图像产品,内部几何精度相当好,有较小的旋转、比例误差。采用一阶多项式即可建立TM图像和地形图之间的几何关系,其误差为1个像元左右。TM图像的大地绝对误差,可通过将整个TM图像沿x,y方向平移的方法来加以校正。

In order to certificate the accuracy of Landsat-5 systematically corrected TM image data, an accuracy analysis of four scenes has been conducted based on 1: 50 000 topographic map. The results show that TM image data has high internal geometric fidelity and negligible rotation and scale differences. Polynomial of first degree has proved sufficient to fit full scene to the topographic map to one pixel accuracy. Geodetic error can be corrected by translating the whole TM image along x and y direction.