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原文名:Atmospheric correction of visible to middle-infrared EOS-MODIS data over land surfaces: Background, operational algorithm and validation
发表于:JOURNAL OF GEOPHYSICAL RESEARCH, VOL.102, NO.D14,PAGES 17,131-17,141, JULY 27, 1997
EOS-MODIS数据在可见光-中红外波段地表大气校正:背景、操作算法及验证
1996年3月21日接收,1996年12月3日修改完毕,1996年12月3日接受
摘要:NASA的MODIS仪器为地表研究提供了250m分辨率的全球信息源。在获取基于地表发射率衍生出的各种生物物理参数之前,大气层顶部信号需要进行大气效应的辐射定标与校正。本文提供了一些现有最新的用于MODIS 1-7波段(中心位于648,858,470,1240,1640和2130nm)的大气校正技术的详细介绍。之前的校正方案都是假设一个标准大气,具有0值或者常数的气溶胶含量以及均一的郎伯表面。这里介绍的可行的MODIS大气校正算法使用了MODIS提供的气溶胶和水蒸气信息,矫正了邻近效应及观察表面的方向属性。本位还描述了一些该项技术可实现的部分及其优化。该技术应用于Landsat的TM数据,NOAA的AVHRR数据,MODIS的MAS和AERONET的根据地面测量进行验证等。
1.引言
使用MODIS数据检索陆地参数(如BRDF、反射率、植被指数、光合有效辐射分量FPAR、叶面积指数)需要先将大气层顶部辐射值转化到地表反射率。通过本文提出的算法和相关处理代码,可以将MODIS 1B数据进行大气效应校正,生成地表反射率产品。大气校正需要输入影响大气层顶部信号测量的变量成分(见图1,表1a和1b)以及一个大气散射和吸收的校正模型(一个波段吸收模型和多次散射(multiple-scattering)矢量代码)。另外,一个准确的大气校正需要大气点扩散函数(高分波段)的校正以及大气效应和表面BRDF的耦合。
过去的几年中,法国光学实验室投入大量精力致力于大气效应的建模。最近发布的6S辐射代码[Vermote et等,1997],很好的适用于各种遥感应用并且很好的进行了记录。它包括对大气点扩散效应和表面反射方向性的模拟。我们现在利用6S代码作为参考,进行各种算法间的比较,用来验证MODIS大气校正算法的校正效果。比如说,表1a和表1b表明了6S代码应用于现有环境传感器的大气效应相对关系。
我们的计划是利用MODIS大气产品和附属数据集作为大气校正的数据。利用MODIS气溶胶群进行了区域气溶胶补偿。该操作算法一个重要的方面是不进行精度目标让步的情况下,协调大量输入数据和产品的快速输出。
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