基于Landsat 5 TM数据反演地表温度

Retrieval Land Surface Temperature Based on Landsat 5 TM

利用Landsat 5第6波段数据,根据单窗算法反演合肥市地表温度。针对在夏季大气中水汽含量比较大的问题,利用MODTRAN中纬度夏季模式模拟出在大气水汽含量位于0.4～5.4 g/cm^2区间时,大气透过率与大气水汽含量之间的关系。利用模拟出的结果及MODIS水汽产品对TM图像进行大气校正并反演地表温度,选择均匀区的反演温度值与MODIS温度产品比较,比较结果显示植被均匀区的温差在1K以内,城镇建筑均匀区的温差在1.1 K以内,故可用此方法对TM图像进行大气校正进而反演地表温度。

The thermal band 6 data of Landsat 5 is used to retrieve land surface temperature of Hefei with mono-window algorithm. The atmospheric water vapour content is high in summer. MODTRAN is used to simulate the relationship between water vapour content and atmospheric transmittance when the water vapour content is between 0.4 g/cm2 and 5.4 g/cm2. And then the simulation result and MODIS water vapor product are used in atmospheric correction and Landsat surface temperature retrieval. The uniform zone temperature is selected to compare with the MODIS temperature product. The comparison result shows that the contrast of vegetation is less than 1 K while construction is less than 1.1 K. The result can be used to atmospheric correction and then retrieve land surface temperature