基于有理函数模型的北京二号影像几何校正

Geometric Correction of Based on Beijing-Ⅱ Image with Rational Function Model

高分辨率遥感影像被广泛应用于各领域,但由于几何畸变的影响,在使用中会产生不利因素,因此对高分辨率影像的校正处理成为研究热点。通过研究北京二号高分辨率影像基于有理函数模型的几何校正实验,包括选取不同控制点数量和统计控制点地势分布位置,笔者得到试验结果:不同控制点数量会对校正精度有影响,当控制点个数达到一定数量时,平面中误差趋于定值;控制点位置的地势分布也会影响校正精度,当控制点平地分布越多,其校正精度越高。因此,对控制点选取需数量适中且均匀分布于平地。

High-resolution remote sensing images are widely used in various fields,but in the use,the influence of geometric distortion causes adverse factors.So the correction of high-resolution images has become the research hotspot.By studying the geometric correction test of Beijing-Ⅱ high resolution image based on rational function model,including selecting different numbers of control points and counting the distribution of control points.Then the experimental results are obtained:the different numbers of control points will have an effect on the correction accuracy.When the number of control points reaches a certain number,the root mean square error in the plane tends to be fixed.And the topographic distribution of the control points also affects the correction accuracy.When the control points are distributed on the flat ground more evenly,the higher the correction accuracy is.Therefore,the number of control points should be moderate and the distribution should be even on the flats.