“高分四号”卫星正射校正精度分析
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摘要
探究"高分四号"(GF-4)卫星影像在无精确控制点情况下进行基于有理函数模型的正射校正时,地形因素、参考影像以及高程数据对其结果的精度影响,并给出最适合GF-4卫星正射校正的经验性结论;文章分别对不同地形、不同分辨率的Landsat8参考影像以及不同分辨率的DEM数据进行正射校正实验,并从自动生成的控制点个数以及均方根误差两方面进行了精度分析。结果表明基于有理函数模型的正射校正对于不同的地形有着不同的校正效果,山地整体效果上略好于平原与城市;参考影像的全色波段与GF-4卫星影像的空间分辨率比例在0.8～1.0之间时,正射校正效果最佳;DEM对于GF-4卫星影像垂直方向正射校正效果显著,且分辨率越高校正效果越好。GF-4卫星影像的正射校正精度高低不仅与自身图像所包含的地形地貌有关,而且其参考影像与DEM数据的分辨率也会对精度有影响,宜选用分辨率相近的参考影像以及较高分辨率的DEM数据参与GF-4卫星的正射校正。
In this paper the influence of terrain factors, reference images and elevation data on the accuracy of orthographic correction is explored based on RFM model of GF-4 images without accurate control points, and an empirical summary about the GF-4 satellite Orthorectification is given. The Orthorectification experiments are executed for different terrains and landsat8 reference images with different resolution and different DEM data, and then the precision is analyzed in two aspects, i.e. the automatic generation of control point number and the RMSE. The correction effects of RMF model orthorectification are different for different terrains, and the overall effect of mountain area is slightly better than that of plain and city. When the spatial resolution ratio of panchromatic band of reference image for GF-4 satellite image is between 0.8-1.0, the orthophoto correction has the best effects. DEM has significant effect on vertical correction of GF-4 satellite images, and the effect is improved with the increase of the resolution. At last, some helpful conclusions are obtained in the paper, that is, the accuracy of orthophoto correction of GF-4 satellite image is not only related to the topography and landform contained in the image, but also affected by the resolution of its reference image and DEM elevation data. Additionally, the orthophoto correction can have better results while selecting reference image with similar resolution and DEM data with high resolution.
In this paper the influence of terrain factors, reference images and elevation data on the accuracy of orthographic correction is explored based on RFM model of GF-4 images without accurate control points, and an empirical summary about the GF-4 satellite Orthorectification is given. The Orthorectification experiments are executed for different terrains and landsat8 reference images with different resolution and different DEM data, and then the precision is analyzed in two aspects, i.e. the automatic generation of control point number and the RMSE. The correction effects of RMF model orthorectification are different for different terrains, and the overall effect of mountain area is slightly better than that of plain and city. When the spatial resolution ratio of panchromatic band of reference image for GF-4 satellite image is between 0.8-1.0, the orthophoto correction has the best effects. DEM has significant effect on vertical correction of GF-4 satellite images, and the effect is improved with the increase of the resolution. At last, some helpful conclusions are obtained in the paper, that is, the accuracy of orthophoto correction of GF-4 satellite image is not only related to the topography and landform contained in the image, but also affected by the resolution of its reference image and DEM elevation data. Additionally, the orthophoto correction can have better results while selecting reference image with similar resolution and DEM data with high resolution.
引文
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[14]汪韬阳,张过,李德仁,等.资源三号测绘卫星影像平面和立体区域网平差比较[J].测绘学报,2014,43(4):389-395.WANG Taoyang,ZHANG Guo,LI Deren,et al.Comparison between Plane and Stereo Block Adjustment for ZY-3 Satellite Images[J].Acta Geodaeticaet Cartographica Sinica,2014,43(4):389-395.(in Chinese)
[15]袁修孝,汪韬阳.CBERS-02B卫星遥感影像的区域网平差[J].遥感学报,2012,16(2):310-324.YUAN Xiuxiao,WANG Taoyang.Adjustment for CBERS-02B Satellite Image[J].Journal of Remote Sensing,2012,16(2):310-324.(in Chinese)
[16]张过,李德仁,秦绪文,等.基于RPC模型的高分辨率SAR影像正射纠正[J].遥感学报,2008(6):942-948.ZHANG Guo,LI Deren,QIN Xuwen,et al.Geometric Rectification of High Resolution Spaceborne SAR Image Based on RPC Model[J].Journal of Remote Sensing,2008(6):942-948.(in Chinese)
[17]王红平,刘修国,罗红霞,等.基于RPC模型的IRS-P5影像正射校正[J].地球科学-中国地质大学学报,2010,35(3):485-489.WANG Hongping,LIU Xiuguo,LUO Hongxia,et al.IRS-P5 Satellite Image Ortho Corrections Using RPC Model[J].Earth Science:Journal of China University of Geosciences,2010,35(3):485-489.(in Chinese)
[18]FENG Gao,JEFFREY G M,ROBERT E W.Automated Registration and Orthorectification Package for Landsat and Landsat-like Data Processing[J].Journal of Applied Remote Sensing,2009,3(1):1-20.(in Chinese)
[2]马文坡,练敏隆.“高分四号”卫星凝视相机的技术特点[J].航天返回与遥感,2016,37(4):26-31.MA Wenpo,LIAN Minlong.Technical Characteristics of the Staring Camera on Board GF-4 Satellite[J].Spacecraft Recovery&Remote Sensing,2016,37(4):26-31.(in Chinese)
[3]韦玉春,唐国安.遥感数字图像处理教程[M].2版.北京:科学出版社,2015:114-115.WEI Yuchun,TANG Guoan.Remote Sensing Digital Image Processing[M].2nd ed.Beijing:Science Press,2015:114-115.(in Chinese)
[4]于博文,田淑芳.“高分一号”卫星数据几何校正研究[J].遥感技术与应用,2017,32(1):133-139.YU Bowen,TIAN Shufang.Geometric Correction Research on Satellite GF-1 Data[J].Remote Sensing Technology&Application,2017,32(1):133-139.(in Chinese)
[5]黄世存,吴海平,冯登超.“高分一号”多光谱高分相机全色图像正射精度验证与分析[J].遥感信息,2015,30(2):85-88.HUANG Shicun,WU Haiping,FENG Dengchao.Ortho Accuracy Analysis of GF-1 PAN Imagery[J].Remote Sensing Information,2015,30(2):85-88.(in Chinese)
[6]刘佳,王利民.基于有理多项式模型区域网平差的GF-1影像几何校正[J].农业工程学报,2015,31(22):146-154.LIU Jia,WANG Limin.Geometric Correction of GF-1 Satellite Images Based on Block Adjustment of Rational Polynomial Model[J].Transactions of the Chinese Society of Agricultural Engineering,2015,31(22):146-154.(in Chinese)
[7]樊文锋,李鸿洲,温奇,等.“高分二号”卫星影像正射纠正精度分析[J].测绘通报,2016(9):63-66.FAN Wenfeng,LI Hongzhou,WEN Qi,et al.Research on Accuracy of Digital Ortho Rectification of GF-2 Image[J].Bulletin of Surveying&Mapping,2016(9):63-66.(in Chinese)
[8]江威,何国金.基于北斗和GPS的“高分二号”全色影像正射精度验证与分析[J].国土资源遥感,2017,29(3):211-216.JIANG Wei,HE Guojin.Ortho Accuracy Validation and Analysis of GF-2 PAN Imagery Based on Beidou Satellite Navigation System and GPS[J].Remote Sensing for Land&Resources,2017,29(3):211-216.(in Chinese)
[9]徐文,龙小祥,李庆鹏,等.“高分四号”卫星影像辐射与几何精度评价[J].航天返回与遥感,2016,37(4):16-25.XU Wen,LONG Xiaoxiang,LI Qingpeng,et al.Image Radiometric and Geometric Accuracy Evaluation of GF-4 Satellite[J].Spacecraft Recovery&Remote Sensing,2016,37(4):16-25.(in Chinese)
[10]LI Pengfei,SUN Kaimin.An Emergency Georeferencing Framework for GF-4 Imagery Based on GCP Prediction and Dynamic RPC Refinement[J].Remote Sensing,2017,9(10):1-17.
[11]皮英冬,杨博.基于有理多项式模型的GF-4卫星区域影像平差处理方法及精度验证[J].测绘学报,2016,45(12):1448-1454.PI Yingdong,YANG Bo.Block Adjustment and Accuracy Validation for GF-4 Patch Images Based on RFM[J].Acta Geodaetica et Cartographica Sinica,2016,45(12):1448-1454.(in Chinese)
[12]YANG Bo,PI Yingdong.Relative Geometric Refinement of Patch Images without Use of Ground Control Points for the Geostationary Optical Satellite GF-4[J].IEEE Transactions on Geoscience&Remote Sensing,2018,56(1):474-484.
[13]BIAN Jinhu,LI Ainong,ZHAO Wei,et al.An Automatic Orthorectification Approach for the Time Series GF-4 Geostationary Satellite Images in Mountainous Area[C]//2017 IEEE International Geoscience and Remote Sensing Symposium(IGARSS).Fort Worth TX:IEEE,2017:546-549.
[14]汪韬阳,张过,李德仁,等.资源三号测绘卫星影像平面和立体区域网平差比较[J].测绘学报,2014,43(4):389-395.WANG Taoyang,ZHANG Guo,LI Deren,et al.Comparison between Plane and Stereo Block Adjustment for ZY-3 Satellite Images[J].Acta Geodaeticaet Cartographica Sinica,2014,43(4):389-395.(in Chinese)
[15]袁修孝,汪韬阳.CBERS-02B卫星遥感影像的区域网平差[J].遥感学报,2012,16(2):310-324.YUAN Xiuxiao,WANG Taoyang.Adjustment for CBERS-02B Satellite Image[J].Journal of Remote Sensing,2012,16(2):310-324.(in Chinese)
[16]张过,李德仁,秦绪文,等.基于RPC模型的高分辨率SAR影像正射纠正[J].遥感学报,2008(6):942-948.ZHANG Guo,LI Deren,QIN Xuwen,et al.Geometric Rectification of High Resolution Spaceborne SAR Image Based on RPC Model[J].Journal of Remote Sensing,2008(6):942-948.(in Chinese)
[17]王红平,刘修国,罗红霞,等.基于RPC模型的IRS-P5影像正射校正[J].地球科学-中国地质大学学报,2010,35(3):485-489.WANG Hongping,LIU Xiuguo,LUO Hongxia,et al.IRS-P5 Satellite Image Ortho Corrections Using RPC Model[J].Earth Science:Journal of China University of Geosciences,2010,35(3):485-489.(in Chinese)
[18]FENG Gao,JEFFREY G M,ROBERT E W.Automated Registration and Orthorectification Package for Landsat and Landsat-like Data Processing[J].Journal of Applied Remote Sensing,2009,3(1):1-20.(in Chinese)