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基于Landsat-TM图像自身的反射率反演方法
引用本文:闵祥军,朱永豪.基于Landsat-TM图像自身的反射率反演方法[J].遥感技术与应用,1997,12(3):1-9.
作者姓名:闵祥军  朱永豪
作者单位:(中国科学院安徽光机所 合肥 230031)
摘    要:针对Landsat-TM图像,设计了一种简单的反射率反演方法。该方法的一个显著特点是不依赖于任何外部信息,运算速度快。大气路径辐射度的确定是本方法的关键,为此,对通常的暗目标法进行了改进。程序设计中采用了参数固化技术和半经验解析数值处理算法,避免了复杂的传输方程求解问题,并保证了反演结果的精确性。应用该方法,对1992年9月25日敦煌市西戈壁的一幅Landsat-5 TM图像进行了大气订正,并将反演结果与1994年6月和1996年9月在该地区的地面测量数据进行了比较。

关 键 词:TM图像  反射率反演  暗目标扣除  大气订正  参数固化
收稿时间:1997-03-16
修稿时间:1997-07-02

A Method of Reflectance Retrieval Based on Image of Landsat-5 TM
MIN Xiangjun ZHU Yonghao.A Method of Reflectance Retrieval Based on Image of Landsat-5 TM[J].Remote Sensing Technology and Application,1997,12(3):1-9.
Authors:MIN Xiangjun ZHU Yonghao
Affiliation:(Anhui Institute of Optics and Fine Mechanics,The Chinese Academy of Sciences,Hefei  230031)
Abstract:An image-based retrieval method of surface reflectance for Landsat-5 TM images is proposed.An outstanding feature of this method is that all needfull parameters,such as aerosol optical depth,single scattering albedo,are derived from the information contained in the images.The determination of atmospheric path radiances was performed by improv- ing the traditional dark-object subtraction technique.In order to avoid solving the complex radiative transfer,we make use of parameter embedment technique and semi-empirically numerical algorithm in program design.The method is evaluated and proved to be accu- rate,rapid and useful by simulation.As one of its vertifications,we applied the method to landsat-5 TM image obtained on September 25, 1992 to retrieve the surface reflectance, and compared them with field-measured reflectances performed in June 1994 and Septem- ber 1996 respectively.
Keywords:Reflectance retrievalzz  Dark-object subtractionzz  Atmospheric correctionzz  Parameter embedmentzz
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