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Impact of GCP distribution on the rectification accuracy of Landsat TM imagery in a coastal zone

ISSN号：0253-505X
期刊名称：《海洋学报：英文版》
时间：0
分类：P71[天文地球—海洋科学]
作者机构：[1]College of Geographic Sciences, Nanjing Normal University, Nanjing 2113097, China, [2]Telecommunication Engineering Department, Nanjing University of Posts ＆ Telecommunications, Nanjing 210003, China
相关基金：This research was financially supported by a grant from the joint key project of National Natural Science Foundation of China under contract No. 50339010） and the National ＂ 211＂ Key Project of China. We are indebted to Dr. Gao Jiaqing from University of Auckland for his instructions and suggestions on this article.

作者： ZHANG Ying[1], ZHANG Dong[1], GU Yan[2], TAO Fei[1]

关键词：地面控制点, 图像纠正, 陆地卫星, 海岸区, image rectification, ground control point, rectification residuals, coastal zone

中文摘要：

目的是在形象校正的精确性上探索地面控制点(GCP ) 的空间分发的效果。区域分布式、线性地分布式的 GCP 被用来修正一个沿海的地区的一幅陆地卫星 TM 图象。校正精确性对 99 个独立的点被检查在上内部没有地面控制的潮汐的泥公寓。结果显示在这些区域上的剩余的 root-mean-square 错误比它的测量 GCPs 的对应物若干次大。如果 GCP 空间地在一个区域上被驱散，剩余在东行航程(R~2 =0.827 ) 与距离稳定地波动，但是增加到控制的来源。在 northing，他们在 150 m 附近波动直到 15 km，他们在变化的一个小范围稳定地在以外起床。这些剩余比在东行航程从距离是不太可预言的到控制的来源(R~2 = 0.517 ) 。如果 GCP 沿着一根控制线是分布式的，剩余线性地与距离升起到它并且能干地预言(R~2 = 0。877 ) 在对它垂直的方向。在到它的方向平行，距离几乎没在校正剩余上有很少影响。

英文摘要：

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 （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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