反照率动态反演及与陆面过程模式空间尺度匹配研究

The difference of land surface feature and physical characteristics is mainly reason that cause anisotropic distribution falbedo , it also is the reason that form areal climate.Through applying directional reflectance models and NOAA14-AVHRR data, we retrieve the monthly mean albedo of Qingzang plateau in 1997 , and analyse the result.There are different climatic regions in China such as temperate zone, subtropical zone and tropical zone. The interactions between meteorological factors and vegetation in each climatic region are significantly different. Many factors such as the inhomogeneous ribution of rainfall and temperature, difference of vegetation types and soil textures play important roles in interactions. To develop advanced land surface.feature models, these factors must be considered.Based on the daily mean rainfall and total active temperature from 334 weather stations and NOAA-AVHRR data from NASA during the period from 1982 to 1994, the influence of rainfall and total active temperature on vegetation in China is analyzed from April to July through correlation analysis. The Atmospheric correction scheme of channel one nd channel two follows the algorithm of Gordon. NDVI is composited by taking the maximum NDVI value from the daily data within 10 days, with spatial resolution of 8km*8km.

反演方法的局限性、空间尺度不匹配是制约遥感数据直接应用于陆面过程研究的难点所在。本工作通过改进反照率双向反射模型，建立适用于各种地表覆盖类型的动态反照率反演方法，同时分析地表特征各组份权重变化对不同空间尺度反照率的影响，建立基于地表特征数据库之上的不同空间尺度反照率的转换模型，使遥感数据能够科学的应用于陆面过程模式。