基于北斗和GPS的高分二号全色影像正射精度验证与分析  

Ortho accuracy validation and analysis of GF-2 PAN imagery based on Beidou satellite navigation system and GPS

作　　者：江威 何国金 龙腾飞 尹然宇 宋小璐 袁益琴 凌赛广 

机构地区：[1]中国科学院遥感与数字地球研究所,北京100094 [2]中国科学院大学,北京100049 [3]中国地质大学(武汉)李四光学院,武汉430074

出　　处：《国土资源遥感》2017年第3期211-216,共6页Remote Sensing for Land & Resources

基　　金：国家重点研发计划全球变化及应对专项项目"大尺度全球变化数据产品快速生成方法"(编号:2016YFA0600302);海南省重大科技计划项目"海南省遥感大数据服务平台建设与应用示范"(编号:ZDKJ2016021);海南省重大科技计划项目"新型海洋信息感知关键技术及设备研发"(编号:ZDKJ2016015-1)共同资助

摘　　要：高分二号(GF-2)卫星几何精纠正是其广泛应用的前提。以福州市作为实验区,选择北斗卫星导航系统(北斗)和GPS野外测量获取控制点和检查点,采用像方平移、像方漂移和像方仿射变换3种方法对有理函数模型进行误差补偿,验证分析控制点测量精度、分布、数目以及纠正方法对GF-2全色影像纠正的影响,并分析了北斗应用于GF-2全色影像正射纠正的潜力。实验结果表明:少量分布均匀的控制点就可以消除GF-2全色影像纠正后的系统几何误差;3种纠正方法中像方仿射变换方法精度最高,其中GPS控制测量下检查点平面均方根误差为1.49 m,北斗RTK控制测量下检查点平面均方根误差为1.51 m,GPS与北斗RTK控制测量下的影像纠正精度接近;北斗2种测量模式中,只有RTK模式能够满足GF-2全色影像纠正需求。上述研究表明,GF-2全色影像能够利用GPS和北斗RTK模式控制测量下的少量分布均匀高精度控制点达到较高纠正精度,满足实际应用需求。High geometric correction precision of GF-2 is a prerequisite for its widespread application. In this study,the authors selected Fuzhou as an experimental area. The ground control points( GCPs) were measured by Beidou satellite navigation system( BDS) and GPS respectively in the experimental area,which were used for geometric correction of the GF-2 panchromatic( PAN) image. The rational function model( RFM) was corrected by block adjustment with ground measurement point. The authors validated control point accuracy,distribution,as well as correction method for GF-2 panchromatic image correction,and analyzed the potential application to GF-2 PAN imagery geometric correction. The results show that a few control points can eliminate geometric error of GF-2 PAN imagery system. Affine transformation can reach the highest correction precision among three correction methods. Plane root mean square error( RMSE) of GPS check points using affine transformation is 1. 49 m and plane RMSE of Beidou RTK check points using affine transformation is 1. 51 m. In the two measuring modes of Beidou,Beidou RTK precision can satisfy the demand of GF-2 PAN imagery correction. The results show that,with a few high precision control points using GPS and Beidou RTK,GF-2 PAN imagery can reach high geometric correction accuracy and satisfy the demand of practical application.

关 键 词：高分二号卫星 北斗卫星导航系统 GPS 几何纠正 精度验证 有理函数模型 

分 类 号：TP751.1[自动化与计算机技术—检测技术与自动化装置]