MODIS通道1和通道2大气订正的一种快速实用方法  

A feasible method on atmospheric correction to channel 1 and 2 for MODIS

作　　者：程乾[1] 黄敬峰[1] 王人潮[1] 顾俊强[2] 

机构地区：[1]浙江大学资源科学系,浙江杭州310029 [2]浙江省气象局气候中心,浙江杭州310004

出　　处：《浙江大学学报（理学版）》2004年第5期560-564,共5页Journal of Zhejiang University（Science Edition）

基　　金：国家自然科学基金资助项目 ( 4 0 1710 65 );国家"863"子课题 ( 2 0 0 2 AA13 0 0 10 )和 ( 2 0 0 2 AA2 43 0 11)

摘　　要：提出了利用气象资料对 MODIS影像进行大气校正的一种快速实用方法 .读取 MODIS前两个通道 2 5 0min的反射率 ,采用常用的黑色目标扣除法 (Dark- objectsubtraction)计算天空程辐射 ,通过卫星过境时刻的气象能见度和水汽资料计算大气透过率 ,最后推导出目标物的反射率 .通过比较两个邻近日期 MODIS影像校正前后的归一化植被指数 (NDVI)值 ,得出利用本文提出的方法对 MODIS进行大气校正所得到的 NDVI值更接近实际情况 .结果表明 :利用气象能见度和水汽压可以对It is necessary to perform atmospheric correction for extracting quantitative information from MODIS image. A feasible method by which atmospheric correction of MODIS image was performed by using meteorological data was discussed. The reflectance of two bands was obtained from MODIS and the approach is based on DOS method to calculate the path radiance with the reasonable dark-object reflectance choice. The atmospheric parameters at overpass time were evaluated by using interpolation among local meteorological records and the atmospheric transmittance was calculated. At last the reflectance of objects was obtained. This approach was evaluated by comparing MODIS-NDVI in close date before and after atmospheric correction. Results showed that MODIS-NDVI by using this approach is close to true conditions. It will be feasible to use meteorological visibility and vapor pressure data to perform atmospheric correction of MODIS data.

关 键 词：MODIS 气象能见度 水汽压 大气订正 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]