多时相遥感数据对城市热岛效应的研究——以西安市为例

Research on Multi Temporal Remote Sensing Data for Urban Heat Island Effect:Taking Xi'an City as an Example

热岛效应是影响我国城市环境的重要因素,本文基于多时相的Landsat 7 ETM+和Landsat 8 TIRS影像,对西安市2002年和2013年的土地进行分类以及地表温度反演,在此基础上将土地分类影像图和温度分割影像图进行叠加,分析了不同的土地利用类型温度差异、下垫面的空间结构与热场分布的关系以及热场的分布变化与城市变迁的关系。结果表明:不同的土地利用类型的物理属性和生物学属性差异是造成城市热岛效应的内在原因,下垫面空间结构的差异是造成城市热岛效应的外在原因,城市热场的动态变化方向与城市的变迁方向具有一致性。

The relationship between heat island effect is an important factor in the urban environment of our country, this paper based on multi phase of Landsat7 ETM ＋ and landsat8 TIRS image, of Xi＇an City in 2002 and 2013 land for classification and land surface temperature inversion. On this basis of the land will be image classification diagram and temperature segmentation shadow images were superimposed, analyzes the different land using type temperature difference, underlying surface spatial structure and thermal field dis- tribution and thermal field distribution and urban change direction. The results show that different land use types of physical properties and biological properties of difference is caused by the inherent reasons of the urban heat island effect, the differences in underlying surface structure is caused by external reasons for the urban heat island effect, the direction of changes of urban thermal field dynamic changes of direction and city with consistency.