基于Landset8影像的城市绿地冷岛效应分析——以北京市为例

Cool Island Effect Analysis of Urban Green Land Based on Landsat8 TIRS Image:Take Beijing as an Example

城市绿地由于其内部植被的降温增湿作用,可以有效地缓解城市热岛效应。本文以北京市城市建成区的城市绿地为研究对象,基于2013年7月31日landsat8遥感影像,对北京市地表温度进行反演,结合Google Earth地图,利用遥感影像反演软件、ArcGIS和Fragstats软件,计算城市绿地空间配置对周边环境的冷岛效应,探寻城市绿地的景观格局指数与冷岛效应的对应关系。研究表明:不同城市绿地的冷岛效应存在较大差异,但是都能取得较为明显的降温效果;城市绿地的面积与其冷岛效应之间具有正相关性,而且二者之间表现为线性关系或指数关系;城市绿地的周长面积比与其冷岛效应具有负相关性,而且二者之间表现为倒数关系。

Urban green land plays an important role on cooling and humidification which can effectively alleviate the urban heat island effect.In this paper,Beijing was selected as the research area,and a Landsat8 TIRS image obtained on July 31,2013 was regarded as the basic data,the brightness temperature was inversed,combined with the Google Earth map,with remote-sensing image inversion software,ArcGIS and Fragstats software,the cool island effect of urban green land was analyzed,and the results were as follows:All urban green land has evident cooling effect;There was great different cold island effect between different urban green land;There was a positive correlation between the area of urban green land and cool island effect,furthermore,with linear or exponential relationship;There was a negative correlation between the ratio perimeter to area and cool island effect,moreover,with reciprocal relationship between them.