利用Landsat-8 OLI反演大气气溶胶的可见光谱段地表反射率估算  

Estimation of Visible Surface Reflectance for Retrieving Aerosol Optical Depth Using Landsat-8OLI Data

作　　者：吕春光[1,2] 田庆久[1,2] 王磊[1,2] 黄彦 耿君[1,2] 

机构地区：[1]南京大学国际地球系统科学研究所,南京210023 [2]江苏省地理信息技术重点实验室,南京210023

出　　处：《遥感信息》2015年第1期43-50,共8页Remote Sensing Information

基　　金：国家科技重大专项(30-Y20A01-9003-12/13);国家重点基础研究发展计划项目(2010CB951503)

摘　　要：准确估算地表反射率的贡献一直是遥感反演大气气溶胶光学厚度过程中的重点和难点。为了促进Landsat-8OLI传感器在地表参数定量化特别是大气遥感领域的应用,本文提出一种利用OLI 1.6μm、2.2μm短波红外谱段数据估算遥感影像可见光地表反射率的方法。该方法依托于MOD04产品地表反射率估算模式,通过光谱归一化和构建新的短波红外植被指数等过程,建立OLI地表反射率估算模式,通过误差分析发现该模式能够有效地降低由于传感器光谱响应不同对估算结果的影响,对应用在OLI遥感影像的计算结果与同时间同区域MOD04产品地表反射率进行比较,表明其结果有较高的相关性和可靠性。Accurate estimation to the contribution of the surface reflectance has been the focus and the difficult point in aerosol optical depth (AOD)retrieval from remote sensing data.In order to promote the applications of Landsat-8 OLI data in quantification of surface physical parameters particularly in the field of atmospheric remote sensing,a method to estimate the optical surface reflectance from OLI images was put forward using OLI 1.6μm and OLI 2.2μm short infrared bands.The method was proposed based on the surface reflectance estimation mode of MOD04 product,by means of processes such as spectral normalization,building a new short infrared vegetation index and so on.The error analysis shows the OLI estimation mode can effectively reduce the error effect caused by spectral response differences.The comparison of the surface reflectance estimation results between the OLI and MOD04 product in the same time and same area represents that the estimation results obtained by OLI estimation mode have high correlation and reliability.

关 键 词：地表反射率 气溶胶 Landsat-8 光谱归一化 植被指数 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]