基于SRTM控制的高分遥感影像区域网平差方法

Geometric Correction of High Resolution Remote Sensing Image Based on SRTM Control

针对异轨高分辨率卫星影像基高比小、重叠区域弱交会现象,本文提出SRTM(Shuttle Radar Topography Mission)控制的高分遥感影像区域网平差方法。该方法以高程值为相邻影像连接点的高程控制,进行光束法区域网平差,进行影像RPC(Rational Polynomial Coefficient)参数精化,避免弱交会情况下高程误差放大现象,降低同名点的相对偏移。采用高分一号四景进行实验,结果表明:通过引入高程控制的光束法区域网平差,改善纠正后影像连接区域错开现象,影像平面相对定位精度提高到一个像素以内,满足相邻影像的拼接需求。

In order to solve the problem of low base height ratio and weak intersection in overlapping regions of high resolution satellite images from different orbits,this paper proposed a bundle block adjustment method of high resolution remote sensing images controlled by SRTM.In this method,the elevation value was used as the elevation control of the adjacent image connection points,the bundle method area network adjustment was carried out,and the RPC parameters of the image were refined,so as to avoid the amplification of elevation error in the case of weak intersection,and reduced the relative offset of the same point.The experiment was carried out with four scenes of GF-1,and the results showed that:by introducing the beam area network adjustment of elevation control,the staggering phenomenon of image connection area after correction was improved,and the relative positioning accuracy of image plane was reduced within one pixel,which could meet the needs of adjacent image mosaic.