金塔绿洲地表特征参数遥感反演研究

Retrieval of Ground Surface Parameter over Jinta Oasis Using the Satellite Data

TM影像是陆地资源卫星(Landsat)携带的专题绘图仪(ThematicMapper,TM)扫描计获取的遥感图像,近年来,该数据得到了广泛的应用。本文使用Landsat-5TM数据推算了金塔地区的地表参数,包括标准化差值植被指数NDVI、修正的土壤调整植被指数MSAVI、植被覆盖度、地表反射率及地表温度。并将地表反射率、地表温度的反演值与观测值进行对比,结果表明:地表温度反演结果的相对误差在9%以内,地表反射率反演结果的相对误差在8%以内。

TM image is the image obtained from Thematic Mapper（TM） scanner carried by Landsat. In this study, Landsat-5 TM data has been used to calculate the following land surface parameters in Jinta oasis： Normalized difference vegetation index（NDVI）, modified soil adjusted vegetation index（MSAVI）, fractional vegetation cover, surface albedo and surface temperature. Then we compared the retrievals of land surface reflectance and temperature with the observed. The results show the relative error of the surface temperature in Jinta area is less than 10%, and the relative error of the surface reflectance is less than 8%.