基于Landsat TM数据的东莞市热岛效应研究

Heat island effect in Dongguan city based on Landsat TM data

本文以东莞市为研究区域,利用1990年、1998年和2005年3期的Landsat TM数据,反演了东莞市地表温度。研究结果表明:①东莞市的高温区主要分布在建成区,低温区主要分布在水体和高植被覆盖区;②1990年到2005年,常温区面积明显减少,低温区面积大幅增加,高温区面积呈增加趋势;③从不同温度区间的转移分析来看,1990年至1998年、1998年至2005年两个时期,常温区发生转化的面积最大,其次是高温区;④地表温度与归一化植被指数都存在明显的负相关关系。

To study the heat island effect in Dongguan City, three Landsat TM images of different times, including 13 October, 1990, 22 December, 1998 and 23 November 2005, were used to retrieve the land surface temperature（LST）. The results showed that： （1）high temperature in Dongguan City mainly covers the urban area, and low temperature mainly covers regions with water and high vegetation-cover; （2）during 1990-2005, the area of normal temperature deceases obviously, but the area of low temperature increases greatly and that of high temperature trends to increase; （3）from change detection of land surface temperature scale regions, normal temperature has the largest changed area, and high temperature follows; （4）there is a negative correlation between land surface temperature （LST） and normalized difference vegetation index （NDVI） .