基于遥感数据的苏州市热岛效应时空变化特征分析

Spatial and Temporal Analysis of Urban Heat Island in Suzhou City by Remote Sensing

城市化对于城市环境的一个重要影响是热岛效应。为了研究苏州市20多年来城市化进程对热岛效应的影响,采用遥感与GIS相结合的方法来定量的分析城市热环境的时空变化。根据1986和2004年两个时相的Landsat TM影像提取了研究区的土地覆盖以及亮温信息,在此基础上通过统计分析和G IS的缓冲区分析对这18a来苏州地区的热岛时空变化及其与土地覆盖变化的关系进行了深入研究。分析结果表明,城市热岛与城区的空间分布之间存在明显的一致性。

One of the significant environmental consequences of urbanization is the urban heat island （UHI）. To study the urban heat island in Suzhou City, remote sensing and GIS technology were utilized to quantitatively analyze the thermal spatial and temporal distribution. Landsat TM images from 1986 and 2004 were selected to derive brightness temperature and land cover maps. Then statistics and GIS buffer analysis were conducted to investigate the thermal pattern changes over a 18-year period. The combined analysis of the temperature images and land cover maps indicates that there is an evident development of the UHI in the 18 years and significant coherence between the urban thermal patterns and urban spatial distribution. This paper also suggests the advantages of remote sensing as an objective and effective method for assessing and understanding spatial characteristics and dynamic changes of urban thermal environment.