基于ETM+数据的新疆于田地区地表温度反演研究

地表温度是地球系统的热状况与水热平衡的关键因子.热红外遥感是获取地表热状况信息的一种非常重要的手段.利用ETM+数据和同时相气象数据获得两个地表温度反演的重要参数:大气透射率和地表比辐射率.运用覃志豪等的单窗算法反演出于田地区的地表温度,并用陆面实际地表温度进行了检验.结果表明,水体表面温度最低,绿洲次之,戈壁最高.地表温度以绿洲为中心从里到外呈环状分布.说明利用ETM+数据反演地表温度是可行的 .并对进一步理解我国西北干旱、半干旱区的土壤-植被-大气系统能量交换状况及区域热量分布差异有着重要意义.

Research on Land Surface Temperature Based on ETM+Data in Yutian, Xinjiang

Land surface temperature is the key factor of the thermal state of the Earth system and the balance of water and heat.Thermal infrared remote sensing is a very important tool for obtaining information about the heat state of land surface.ETM+ data and meteorological data were used in this paper to obtain two important parameters: atmospheric transmittance and land surface emissivity,and the mono-window algorithm of Qinzhihao was used to retrieve land surface temperature in Yutian for Thermal infrared band,then the actual land surface temperature was used to test it.The results showed that surface temperature of water body was the lowest,that of oasis was the next and that of the Gobi Desert was the highest,the land surface temperature of oasis was distributed by annular form.Retrieval of land surface temperature used ETM+ data was feasible.This is very important significance for further understanding the energy exchange status of soil-plant-atmosphere system and the differences of regional heat distribution in arid and semi-arid area of the northwest China.