| Impact of GCP distribution on the rectification accuracy of Landsat TM imagery in a coastal zone |
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| 作者姓名： | ZHANG Ying ZHANG Dong GU Yan TAO Fei |
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| 作者单位： | [1]College of Geographic Sciences, Nanjing Normal University, Nanjing 2113097, China [2]Telecommunication Engineering Department, Nanjing University of Posts ＆ Telecommunications, Nanjing 210003, China |
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| 基金项目： | 国家自然科学基金;国家"211"工程项目 |
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| 摘 要： | 1Introduction Satelliteimagerycanbecomeavaluablecompo nentinageographicinformationsystem(GIS)data baseonlyafterithasbeengeo referencedtoaground coordinatesystemwiththedesiredprojection(Mei,etal.,2001;Wang,etal.,2002).Allimagesre ceivedatagroundreceivingst…
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| 关 键 词： | 地面控制点 图像纠正 陆地卫星 海岸区 |
| 收稿时间： | 2005-10-17 |
| 修稿时间： | 2006-04-02 |
Impact of GCP distribution on the rectification accuracy of Landsat TM imagery in a coastal zone |
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| ZHANG Ying,ZHANG Dong,GU Yan,TAO Fei.Impact of GCP distribution on the rectification accuracy of Landsat TM imagery in a coastal zone[J].Acta Oceanologica Sinica,2006,25(4):14-22. |
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| Authors: | ZHANG Ying ZHANG Dong GU Yan and TAO Fei |
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| Institution: | 1.College of Geographic Sciences, Nanjing Normal University, Nanjing 210097, China2.Telecommunication Engineering Department, Nanjing University of Posts & Telecommunications, Nanjing 210003, China |
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| Abstract: | The purpose is to explore the effect of the spatial distribution of ground control points (GCPs) on the accuracy of imagery rectification. Both area-distributed and linearly distributed GCPs were used to rectify a Landsat TM image of a coastal zone. Rectification accuracy was checked against 99 independent points over the intertidal mudflats with no ground control. Results indicate that the root-mean-square error of residuals over these areas is several times larger than its GCPs-measured counterpart. If the GCPs are spatially dispersed over an area, residuals fluctuate but increase steadily with distance to the source of control in easting (R 2= 0.827). In northing they fluctuate around 150 m until 15 km, beyond which they rise steadily at a small range of fluctuation. These residuals are less predictable from distance to the source of control than in easting (R 2=0.517). If the GCPs are distributed along a control line, residuals rise with distance to it linearly and predictably (R 2=0.877) in the direction perpendicular to it. In a direction parallel to it, the distance has little impact on rectification residuals. |
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| Keywords: | image rectification ground control point rectification residuals coastal zone |
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