基于6S模型的MODIS影像逐像元大气校正及其应用

doi:10.13278/j.cnki.jjuese.201505304

吉林大学学报(地球科学版) ›› 2015, Vol. 45 ›› Issue (5): 1547-1553.doi: 10.13278/j.cnki.jjuese.201505304

基于6S模型的MODIS影像逐像元大气校正及其应用

徐言, 姜琦刚

吉林大学地球探测科学与技术学院, 长春 130026

收稿日期:2015-01-17 发布日期:2015-09-26
通讯作者: 姜琦刚(1964),男,教授,博士生导师,主要从事GIS与遥感地学环境的研究,E-mail:jiangqigang_rs@163.com。 E-mail:jiangqigang_rs@163.com
作者简介:徐言(1987),女,博士研究生,主要从事GIS与遥感研究,E-mail:xuyanby@163.com
基金资助:
中国地质调查局项目(1212010510613)

A Pixel by Pixel Atmospheric Correction Algorithm and Its Application for MODIS Data Based on 6S Model

Xu Yan, Jiang Qigang

College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China

Received:2015-01-17 Published:2015-09-26

摘要/Abstract

摘要：

以获取地物真实反射率为目的,介绍了逐像元大气校正的方法。应用6S模型逐像元综合考虑太阳天顶角、传感器天顶角、相对方位角、大气气溶胶厚度、观测波段以及地表海拔这6个参数,生成查找表,统计分析各参数关于反射率的敏感度;并与以往单一参数校正的方法比较了校正的效果。结果表明,逐像元大气校正算法更加接近地物的真实反射率。利用MODIS地表反射率产品对大气校正的结果进行验证,单一参数、逐像元大气校正的相对误差分别控制在26.9%和12.7%以内;在以植被指数(NDVI)为例的后续遥感定量化反演过程中,逐像元比单一参数大气校正方法计算的NDVI平均高出14.4%。

关键词: 逐像元, 6S, 查找表, 大气校正

Abstract:

In order to obtain the real reflectance of earth objects, we introduced a new method to correct atmospheric parameters pixel by pixel. Considering with the six parameters, including solar zenith angle, sensor zenith angle, azimuth angle, aerosol optical depth, observation band, and surface elevation, we applied the 6S model pixel by pixel to generate a lookup table for analyzing the sensitivity of each parameter to reflectance; and compared the correction results with the ones by the old method using single parameter. The results show that the reflectance by 6S model pixel by pixel is much closer to the true reflectance of objects. By using the MODIS surface reflectance products, we verified the accuracy both of the 6S model pixel by pixel and the single parameter method, and found that their relative errors are 12.7% and 26.9% respectively. Taking vegetation index (NDVI) as an example for the subsequent quantitative remote sensing inversion, the NDVI by 6S pixel by pixel method is 14.4% higher than the single parameter atmospheric correction method.

Key words: pixel by pixel, 6S, lookup table, atmospheric correction

中图分类号:

P407.8

徐言, 姜琦刚. 基于6S模型的MODIS影像逐像元大气校正及其应用[J]. 吉林大学学报(地球科学版), 2015, 45(5): 1547-1553.

Xu Yan, Jiang Qigang. A Pixel by Pixel Atmospheric Correction Algorithm and Its Application for MODIS Data Based on 6S Model[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(5): 1547-1553.

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基于6S模型的MODIS影像逐像元大气校正及其应用

A Pixel by Pixel Atmospheric Correction Algorithm and Its Application for MODIS Data Based on 6S Model

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