香格里拉县TM影像的几何校正

Geometric Correction of Shangri-La County TM images

利用ERDAS IMAGINE软件中的一般多项式模型和共线方程模型对香格里拉县TM影像进行几何精校正,对校正结果进行比较,结果为共线方程模型比一般多项式模型更适合香格里拉县TM影像的几何校正.GCP的数量和定位精度也影响校正结果:一般多项式至少需60个控制点才能使误差控制在一个像元以内,而共线方程模型只需20个控制点,控制点均方根误差随控制点数量的增加而降低.

Using general polynomial model and collinear equation of ERDAS IMAGINE software for geometric correction of Shangri-La County TM images,the corrected results were compared.The results show that the collinear equation model is more suitable for geometric correction of Shangri-La County TM image than the general polynomial model.The number and positioning accuracy of GCP also affect calibration results： at least 60 control points are needed for general polynomial to make the error controlled in less than a pixel,while only 20 control points are needed for the collinear equation model.The RMS error of control points will decrease as the number of control point increases.