基于遥感影像的地表热环境时空变异研究——以西安市核心区为例

Spatial-temporal Variation of Surface Thermal Environment Basedon Remote Sensing Images——with Xi'an Core Area as a Case Study

随着城市化进程和全球变暖的加快,城市热岛效应越发显著。本文以2007年、2013年Landsat5 TM影像和2017年Landsat8 TIRS影像为数据,利用辐射传输方程法对西安市核心区地表温度进行反演,进而对热岛区的空间分布和时空变异情况进行分析。结果表明,2007-2017年,西安市核心区地表温度呈升高趋势,热岛区的空间分布范围由城市中心区向郊区县城和农村不断扩大。

With the acceleration of global warming and urbanization,the urban heat island effect is becoming more and more significant.Based on the Landsat5 TM image in 2007 and 2013 and the Landsat8 TIRS image in 2017 as the data,the spatial distribution and temporal variation were studied using the radiation transfer equation method to invert the surface temperature of the core area of Xi'an city.The results showed that from 2007 to 2017,the surface temperature of the core area of Xi'an increased year by year and the distribution of heat island area in the core of Xi'an continue expanded to suburban counties,towns and rural areas.