Automatic geometric precision correction of Fengyun-2 meteorological satellite imagery

doi:10.3778/j.issn.1002-8331.2011.03.060

Computer Engineering and Applications ›› 2011, Vol. 47 ›› Issue (3): 202-206.DOI: 10.3778/j.issn.1002-8331.2011.03.060

• 工程与应用 • Previous Articles Next Articles

Automatic geometric precision correction of Fengyun-2 meteorological satellite imagery

YANG Lei^1，2，FENG Xiaohu^1，2，GUO Qiang^1，2，LU Feng^1，2，ZHANG Xiaohu^1，2

1.Key Lab of Radiometric Calibration & Validation for Environmental Satellites，China Meteorological Administration，Beijing 100081，China
2.National Satellite Meteorological Center，China Meteorological Administration，Beijing 100081，China

Received:2009-09-03 Revised:2009-11-02 Online:2011-01-21 Published:2011-01-21
Contact: YANG Lei

风云二号气象卫星图像自动几何精校正

杨磊^1，2，冯小虎^1，2，郭强^1，2，陆风^1，2，张晓虎^1，2

1.中国气象局中国遥感卫星辐射测量和定标重点开放实验室，北京 100081
2.中国气象局国家卫星气象中心，北京 100081

通讯作者: 杨磊

Abstract

Abstract: This paper addresses the issue on automatic geometric precision correction for Fengyun-2（FY-2） meteorological satellite.Firstly，the binary landmark template is obtained under the FY-2 nominal projection，and then the binary FY-2 images are obtained by Bayes posterior probability.Maximum Cross Correlation is used to find the landmark mismatches between the binary landmark template and the binary FY-2 images.Quality control measures are used to guarantee the correct landmark matching ratios.Finally，the Direct Linear Transformation（DLT） is used to geometrically precise correct the FY-2 imagery.Tests have shown that this method can effectively improve the FY-2 image navigation accuracy.After the geometric precision correction，the image navigation accuracy improves 31.06% in the south-north direction and 45.21% in the east-west direction，respectively.The analysis has shown that with pre and post geometric precision correction，the FY-2 visible channel image navigation accuracy will be at the best status about Sub-Satellite Point（SSP） noon.And with pre and post geometric precision correction，the south-north image navigation accuracy of the FY-2 visible channel is better than that of the east-west.The successful ratio of this method can achieve 95.29%.

Key words: Fengyun-2（FY-2）, geometric precision correction, automatic landmark matching

摘要： 介绍了一种风云二号（FY-2）卫星图像自动几何精校正系统和方法。首先获得标称图坐标系下的二值化地标模板，然后通过Bayes后验概率，获得二值化FY-2待匹配图像；通过最大相关系数方法将地标模板与FY-2标称图进行匹配，获得地标偏移量；再通过质量控制获得匹配成功的地标对，实现自动的地标匹配。最后，应用DLT变换对FY-2图像进行几何精校正。大量的测试数据表明，该方法能够有效改进FY-2可见光通道图像定位精度。几何精校正后，可见光通道图像在南北方向上的定位精度提高了31.06%，东西方向上的定位精度提高了45.21%。分析指出FY-2可见光通道图像几何精校正前后，定位精度在星下点地方时正午前后均达到最佳状态，且南北方向上的定位精度优于东西方向上的精度。同时，统计分析结果表明，提出的方法成功率达到95.29%。

关键词: 风云二号, 几何精校正, 自动地标匹配

CLC Number:

TP751

YANG Lei^1，2，FENG Xiaohu^1，2，GUO Qiang^1，2，LU Feng^1，2，ZHANG Xiaohu^1，2. Automatic geometric precision correction of Fengyun-2 meteorological satellite imagery[J]. Computer Engineering and Applications, 2011, 47(3): 202-206.

杨磊^1，2，冯小虎^1，2，郭强^1，2，陆风^1，2，张晓虎^1，2. 风云二号气象卫星图像自动几何精校正[J]. 计算机工程与应用, 2011, 47(3): 202-206.

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Automatic geometric precision correction of Fengyun-2 meteorological satellite imagery

风云二号气象卫星图像自动几何精校正

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