基于Landsat 8卫星影像的热岛效应研究——以南京市主城区为例

Study on the Heat Island Effect Based on Landsat 8 Satellite Image——Case of Nanjing City

热岛效应(UHI)的研究对城市环境的建设以及城市生态的保护具有重要意义。以南京市为例,基于2014年～2017年的南京市Landsat8卫星影像,通过土地覆被分类、植被覆盖度计算以及地表温度反演的方法,分析了不同土地利用类型的温度差异以及相同土地利用类型的不同植被覆盖度的温度差异、下垫面的空间结构与热场分布的关系。结果表明导致热岛效应增强的主要原因有:(1)南京市的快速发展使得本地区土地利用类型比重发生重大变化;(2)地表温度与FV呈负相关;(3)城市化造成的下垫面变化等。

The study of UHI is of great significance to the construction of urban environment and the protection of urban ecology.Taking Nanjing as an example,based on the Nanjing Landsat8 satellite image from 2014 to 17,through the classification of land cover,vegetation cover calculation and surface temperature inversion method,the temperature differences of different land use types and temperature differences of different vegetation coverage under the same land use types were analyzed.The relationship between the spatial structure of the underlying surface and the thermal field distribution was analyzed.The results show that the main reasons leading to the enhanced heat island effect are:①The rapid development of Nanjing made major changes in the proportion of land use types in the region;②Surface temperature is negatively correlated with FV;③The underlying surface changes caused by urbanization.