基于DEM的ETM^+图像辐射校正及汉江流域反照率的计算  

RADIANT CORRECTION OF ETM^+IMAGERY BASED ON DEM AND DERIVATION OF ALBEDO IN HANJIANG RIVER BASIN

作　　者：朱叶飞[1] 张万昌[1] 蒋建军[1] 

机构地区：[1]南京大学国际地球系统科学研究所,南京210093

出　　处：《国土资源遥感》2004年第3期8-13,共6页Remote Sensing for Land & Resources

基　　金：国家重点基础研究发展规划项目(2001CB309404);杰出青年B类项目(40128001);教育部重点科学技术项目(2001)。

摘　　要：对Gilabert[1]大气校正方法进行改进,提出了一种简单易行的辐射校正方法。该方法只需从ETM+图像上获取两个不同海拔高程的暗像元,再依据DEM进行大气校正,反演出各个高程上的大气及辐射参数,并在此基础上进行地形校正,进而获取LandsatETM+1～5和7波段的地表反射率,通过对各窄波段地表反射率的线性组合获取反照率。结果表明,该方法可行,精度较高。This study presents an easy and fast radiant correction approach that can be used to perform atmospheric correction and topographic correction in mountain areas. This approach only needs the selection of two dark pixels in different elevations from ETM^+ imagery, and the atmospheric correction based on DEM and dark pixels in different elevations can be conducted so as to get atmospheric and radiant parameters at all elevations. On such a basis, the topographic correction can be carried out and the surface reflectance can be calculated for ETM^+ band 1-5 and 7. At last, a band integration approach is used to obtain the total continuous spectral albedo over the study site. The result shows that the method is effective in the inversion of surface albedo.

关 键 词：DEM 辐射校正 反射率 反照率 汉江流域 

分 类 号：TP751.1[自动化与计算机技术—检测技术与自动化装置]