基于土地监测调查的高分雷达正射纠正精度控制方法研究

Research on the New Method of Controlling the Ortho-rectification Accuracy of High Resolution Radar Data in Land Survey and Monitoring

为了控制高分雷达遥感数据正射纠正精度,选择满足要求的控制点采集方法,对图像采集和实地布设角反射器(CR)两种采集正射纠正控制点的方法进行对比分析,结果表明,传统图像采集控制点方法可以保证纠正精度整体控制在5个像素内,采用角反射器采集控制点的方法可以控制在半个像素左右。因此,在土地调查与监测中,以发现地物变化为主要目的,对地物绝对精度要求不高,可从参考影像采集控制点,否则需选择角反射器实测控制点。

The GCP collection methods were investigated to improve the Ortho-rectification precision of High Resolution Radar Data.The conventional image acquisition and corner reflector in situ were compared and analyzed for collecting high resolution radar remote sensing data GCPs.The result showed that the Ortho-rectification precision could be controlled within 0.5 pixel by taking the new method of the corner reflectors in collecting the GCP but the precision of conventional method was only in 5 pixels.This research concluded that the method of referencing images could be adopted to collect the GCP in case of detecting the changes of the surface features quickly in land survey and monitoring;otherwise,the new method of the corner reflectors should be adopted.