基于MODIS的湖南省地表温度动态变化研究

Study of Land Surface Temperature(LST) Dynamic Changes Using MODIS Data in Hu'nan Province

陆地表面温度是地表能量平衡中的一个非常重要的参数,它在地表与大气相互作用过程中起着重要的作用。以MODIS数据资料研究湖南省地表温度动态变化规律,旨在为研究湖南省城市热岛效应的影响积累资料,为自然资源监测、保护及其相关领域提供理论数据,为相关部门制定决策提供科学依据。在总结和分析当前常用地表温度反演算法的基础上,采用分裂窗算法来反演地表温度,并利用卫星过境当天地面观测站观测的最高温度对反演结果进行验证。研究表明:在热量分布方面,由西北向东南递增,以武陵山、雪峰山东麓为界将全省分成2个区,东部丰富、西部偏少。温度反演结果与地面实测日最高温度曲线走势基本一致,符合实际情况。

Land surface temperature （LST） is very important in surface energy balance, which plays a key role in the interactions between ground and atmosphere. Studying the dynamic mutative disciplinarian of LST in Hu＇nan province based on MODIS data can provide fundamental data for affection of urban heat island, and monitoring and protecting of natural resources. Besides they can be scientific foundation for decision making, based on introducing and analyzing the algorithms commonly used to retrieve surface temperature, a Split-Window Algorithm is chosen to retrieve the surface temperature due to the data on hand and the results of LST is validated with the highest air temperature obtained from meteorological stations. The results show that the caloric increases from northwest to southeast which is divided into two parts by Wuling mountain and the eastern piedmont of Xuefeng mountain. The retrieved LST and the highest actual temperature have the similar trend and the result is more rational.