| ZHANG Ying,ZHANG Dong,GU Yan,TAO Fei. 2006. Impact of GCP distribution on the rectification accuracy of Landsat TM imagery in a coastal zone. Acta Oceanologica Sinica, (4):14－22 |
| Impact of GCP distribution on the rectification accuracy of Landsat TM imagery in a coastal zone |
| Impact of GCP distribution on the rectification accuracy of Landsat TM imagery in a coastal zone |
| Received:October 17, 2005 Revised:April 02, 2006 |
| DOI： |
| Key words:image rectification ground control point rectification residuals coastal zone |
| 中文关键词: image rectification ground control point rectification residuals coastal zone |
| 基金项目: |
| Author Name | Affiliation | E-mail | | ZHANG Ying | College of Geographic Sciences, Nanjing Normal University, Nanjing 210097, China | zhangying1@ninu.edu.cn | | ZHANG Dong | College of Geographic Sciences, Nanjing Normal University, Nanjing 210097, China | | | GU Yan | Telecommunication Engineering Department, Nanjing University of Posts & Telecommunications, Nanjing 210003, China | | | TAO Fei | College of Geographic Sciences, Nanjing Normal University, Nanjing 210097, 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 (R2=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 (R2=0.517). If the GCPs are distributed along a control line, residuals rise with distance to it linearly and predictably (R2=0.877) in the direction perpendicular to it. In a direction parallel to it, the distance has little impact on rectification residuals. |
| 中文摘要: |
| 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 (R2=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 (R2=0.517). If the GCPs are distributed along a control line, residuals rise with distance to it linearly and predictably (R2=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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