高分五号高光谱图像自动大气校正方法  

Automatic Atmospheric Correction Method of Gaofen-5 Hyperspectral Image

作　　者：孔卓 杨海涛 郑逢杰 李扬 齐济 KONG Zhuo;YANG Haitao;ZHENG Fengjie;LI Yang;QI Ji(Graduate School,University of Space Engineering,Beijing 101407,China;Space Security Research Center,University of Space Engineering,Beijing 101407,China;Institute of Space Information,University of Space Engineering,Beijing 101407,China)

机构地区：[1]航天工程大学研究生院,北京101407 [2]航天工程大学太空安全研究中心,北京101407 [3]航天工程大学航天信息学院,北京101407

出　　处：《遥感信息》2023年第2期112-118,共7页Remote Sensing Information

基　　金：基础加强计划重点基础研究项目(2020-JCJQ-ZD-152-12-04)。

摘　　要：高分五号是我国高分辨率对地观测系统重大专项中唯一的高光谱卫星,为有效提高其应用的效能和质量,首先必须对其图像数据进行大气校正。文章提出了一种基于MODTRAN辐射传输模型的高分五号高光谱图像大气校正方法。首先,通过MODTRAN辐射传输模型构建能见度查找表、水汽含量查找表和反射率查找表;其次,分别采用Version 5.2法和大气预处理微分吸收法逐像元反演得到图像能见度和水汽含量;之后,根据反射率查找表逐像元完成高分五号高光谱图像的大气校正,并与FLAASH校正结果进行对比。结果表明,能见度和水汽含量反演效果较好,校正后的光谱曲线与经FLAASH校正的光谱曲线相吻合,3种定量化指标均保持在较高水平,且该方法能够实现高分五号高光谱图像的自动化批量化大气校正,大气校正过程无需其他额外参数,具有一定的应用价值。Gaofen-5 is the only hyperspectral satellite in the major project of China’s high-resolution earth observation system.In order to effectively improve the efficiency and quality of its application,atmospheric correction must be carried out on its image data first.In this paper,an atmospheric correction method of Gaofen-5 hyperspectral image based on MODTRAN radioactive transfer model is proposed.Firstly,the MODTRAN model is used to construct the visibility look-up table,water vapor look-up table and reflectivity look-up table.Secondly,the Version 5.2 and atmospheric preprocessing differential absorption method are used to retrieve the visibility and water vapor content pixel by pixel.Then the atmospheric correction of Gaofen-5 hyperspectral image is completed pixel by pixel according to the reflectivity lookup table,and compared with the FLAASH correction results.The results show that the inversion effect of visibility and water vapor content is good,the corrected spectral curve is consistent with the spectral curve corrected by FLAASH,and the three quantitative indicators all remain at a high level.This method can realize the automatic batch atmospheric correction of Gaofen-5 hyperspectral image,and no additional parameters are required for the atmospheric correction process,which has certain application value.

关 键 词：高光谱图像 大气校正 MODTRAN 高分五号 Version 5.2法 大气预处理微分吸收法 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]