大兴安岭森林地表温度的遥感估算及分析研究

Remote Sensing Estimation Analysis of Land Surface Temperature in Greater Khingan Mountains Forest

TM6热波段在分析地表温度区域差异已经有了广泛的应用,其温度产品多数用于城市热效应等相关研究,但对于森林生态服务功能的调节温度效应方面研究还较少。利用Landsat TM热波段数据反演地表温度有3种算法:辐射传导方程法、单窗算法和普适性单窗算法。首先比较分析这3种反演算法,选择最优法后重点探讨适用于大兴安岭地区的地表发射率估算方法。运用2007年7月23号Landsat TM影像和气象站数据,利用普适性单窗算法反演出地表温度,结果表明:普适性单窗算法可以较好应用于大兴安岭地区的地表温度反演;森林在夏季有降温作用,森林平均温度比城镇的建筑用地平均温度降低7.9℃。

TM band 6 has been widely applied in the analysis of regional differences in land surface temperature. However, most of its products are used for the research related to the study of urban heat effect, few research is conducted in modulating temperature effect of forest ecological service. Landsat TM has a thermal flffrared band （band 6）which can be used to retrieve land surface tempera- ture. So far, three methods have been proposed to retrieve LST from TM6 data, including Radiance Transfer Equation, Mono-window Algorithm and Single-channel Method. In this paper, the three methods were compared and the suitable method for land surface emis- sivity estimation in Greater Khingan Mountains area was discussed. The weather station data and the Landsat TM image used in this paper were acquired on July 23, 2007, and the single-channel method was used to reflect the land surface temperature. The results showed that ： （ 1 ） the single-channel method can be used to estimate the spatial distribution of land surface temperature in Greater Kh- ingan Mountains area. （2） Forests have cooling effects in summer, and compared with the average temperature of the town＇s building area the average temperature of the forest land decreased 7.9 ℃.