基于Landsat影像的杭州市主城区地表温度和热岛效应研究

城市热岛效应是研究全球变暖的重要问题。为了探究杭州市市区的城市热岛效应问题，基于Landsat数据和辐射传输方程法反演出了杭州市主城区的地表温度，以及通过均值-标准差法进行热岛强度分级，分析了2008年、2013年、2019年的地表温度和热岛效应的时空变化，并研究了地表温度与归一化植被指数(normalized difference vegetation index, NDVI)的相关性。结果表明：地表温度具有一定的空间分布规律，在靠近钱塘江的区域，地表温度都要明显更高一些；热岛分布也存在一定的时空规律性，钱塘江两侧热岛区域分布相对较广，并有增加的趋势；杭州市主城区的地表温度与NDVI指数呈现出负相关关系，并存在明显的空间异质性。

Research on Land Surface Temperature and Heat Island Effect in the Main Urban Area of Hangzhou Based on Landsat Images

The urban heat island effect is an important issue in the study of global warming. In order to explore the urban heat island effect in the urban area of Hangzhou, based on the Landsat data and the radiative transfer equation method, the surface temperature of the main urban area of Hangzhou was inverted, and the intensity of the heat island was graded by the mean-standard deviation method. 2008, 2013 and 2019 were analyzed. The temporal and spatial changes of land surface temperature and heat island effect in three years, and the correlation between land surface temperature and normalized difference vegetation index (NDVI) were studied. The results show that: the surface temperature has a certain spatial distribution law, and the surface temperature is significantly higher in the area close to the Qiantang River; the heat island distribution also has a certain temporal and spatial regularity, and the heat islands on both sides of the Qiantang River are relatively widely distributed. There is an increasing trend; the surface temperature in the main urban area of Hangzhou has a negative correlation with the NDVI index, and there is obvious spatial heterogeneity.