激光与光电子学进展, 2010, 47 (4): 040101, 网络出版: 2010-03-30  

中巴地球资源02 星CCD 图像的大气校正研究

Atmospheric Correction of CBERS-02′s CCD Image
作者单位
1 安徽师范大学 物理与电子信息学院,安徽 芜湖 241000
2 安徽师范大学 国土资源与旅游学院,安徽 芜湖 241000
摘要
利用LANDSAT-5 的专题制图仪(TM)对中巴地球资源卫星(CBERS)-02 的CCD1-4 波段进行交叉定标,得到了CCD1-4 波段的参考定标系数。利用该定标系数并应用气象数据和ATCOR3 软件对CBERS-02 的CCD 数据进行大气校正;对比大气修正前后图像的清晰度和归一化的植被指数。结果表明,大气校正增强了图像的对比度,归一化植被指数(NDVI)的均值明显提高,增大了高植被覆盖区与低植被覆盖区NDVI 的差别,植被信息更加突出。对于山区崎岖地表状况下,大气校正后,山体的棱角分明,轮廓清晰可见,还原了下垫面的原貌,有利于遥感信息的提取。
Abstract
A group of reference calibration coefficients for China-Brazil earth resource satellite(CBERS)-02′s CCD data were attained by cross calibration method using LANDSAT-5′s TM data. A method based on meteorological information and ATCOR3 was used in the atmospheric correction of CBERS-02′s CCD four bands. The definition of image and normalized difference vegetation index (NDVI) before correction were compared with them after correction. The result shows that after atmospheric correction the image contrast is enhanced,the mean of NDVI is obviously improved and the difference of NDVI between vegetation and nonvegetation is increased. When the underlying surface is rugged terrain,the corner angle of mountain is distinct,the profile is clear and the original shape is recovered,which benefits the extract of remote sensing information.
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