关于地表反照率遥感反演的几个问题

分析了地表反照率对陆面辐射能收支以及区域和全球气候的影响,强调了地表反照率是遥感反演陆面参数时的第一重要参数,地表反照率或多波段遥感中不同谱段的地表反射率的准确反演常常是准确估算其它陆面参数如植被和土地利用/土地覆盖等状况的先决条件。在对当前关于反照率的概念及容易混淆的术语进行阐述和说明的基础上,简述了遥感反演地表反照率的步骤和主要难点的解决方法,进而对常用陆面过程模式计算地表反照率的过程作了分析,并将其结果与MODIS有关产品进行了比较,强调了遥感与陆面过程模式和气候模式的结合。

Discussion on the Problems on Land Surface Albedo Retrieval by Remote Sensing Data

The effects of albedo on land surface radiation budget and regional and global climate were analyzed in this paper. Retrieving accurately land surface albedo by remote sensing data is the precondition of other land surface parameters retrieval, so albedo is the first important parameter in land surface parameters retrieval by remote sensing data. On the basis of the concept of albedo and other terms often confused were demonstrated, the steps and solutions to main difficulties of retrieving land surface albedo by remote sensing data were given and discussed briefly. At last, we analyzed the process of calculating albedo in present land surface process models and compared the results with the products related to MODIS. The integration of remote sensing and land surface process models and global climate models was emphasized.