基于Landsat卫星资料的苏州城市热岛效应遥感分析

为了对苏州市快速城市化进程中的热岛效应进行研究,采用三个时期的Landsat/TM遥感影像资料来反映地表热辐射信息。基于CART决策树分类得到每个时期的土地覆盖分类图,然后通过单通道算法反演得到地表温度,并对2个时期的地表温度进行标准化分级处理,计算得到采取本文定义,1986,1995及2004年的热岛面积指数分别为4.87%,11.10%和37.87%。研究了城市化过程中城市热岛强度和空间分布变化,分析了土地覆盖变化对热岛效应的影响。结果表明,苏州市存在比较明显的城市热岛效应,并且在20多年中随着城市化过程热岛范围进一步扩展。

Study on the Urban Heat Island of Suzhou City Based on Landsat Remote Sensing Data

To study the urban heat island of Suzhou city in the urbanization,multi-temporal Landsat TM images were adopted to the land thermal environment. First,landcover image in 1986,1995 and 2004 were generated using CART classification trees respectively. Land surface temperatures were retrieved by the single channel method and then normalized and scaled into 6 grades to eliminate temporal climate differences. The effect of heat island and changes of thermal environment were studied based on landcover image and u...