中巴地球资源卫星CCD 影像几何纠正方法比较

由于缺少轨道星历参数和传感器参数, 无法利用共线方程模型完成中巴地球资源卫星影像的精确纠正, 我们在项目中采用多项式纠正、局部区域纠正模型、有理函数模型等近似纠正模型进行中巴地球资源卫星影像纠正对比实验, 对这3 种纠正方法的原理、算法效率、纠正精度等方面进行对比, 通过实验数据分析获得以下结论: 有理函数模型是唯一支持DEM 数据完成中巴地球资源卫星CCD 影像正射纠正的近似纠正数学模型; 多项式纠正模型效率最高; 局部区域纠正模型可以达到很高的纠正精度但不适用于整景影像的纠正。

Compare and Analysis of CBERS CCD Image Geometric Rectification Algorithms

Orbit ephemeris and camera data are needed for strict geometric rectification of CBERS CCD image,which are unavailable in practical applications.As a result,the average polynomial,rational function model(RFM) and rubber sheeting methods are used for the approximate geometric rectification of this kind of imagery.This paper first introduce the several approximate rectification algorithms,then list the result of analysis and precision comparison of different approximate rectification algorithms using testing CBERS CCD images.Experimental results show that the precision stabilization of RFM method is the best,and RFM method support ortho-rectification.The polynomial model is the most efficiency method.The precision of Rubber Sheeting method varies with the number and spatial distribution of control points.