杭州湾南岸城市群热岛效应研究

Urban Heat Island Research in the Urban Agglomeration Region along the South Bank of Hangzhou Bay

以杭州湾南岸城市群为研究区,选取1990、2000和2011年3期Landsat-5 TM遥感影像进行地表温度反演,并采用密度分割法对反演的地表温度影像进行等级划分,对比分析各个时期地表温度分布的空间规律。再提取研究区山地以外的平坦区域,对前后不同时期的地表温度做差值运算,分析地表温度随时间的升降变化。最后提取研究区内的城市建成区,通过计算各时期的热岛比例指数来分析各城市热岛强度的变化情况。

This study took the urban agglomeration region along the south bank of Hangzhou Bay as the study area,and selected Landsat-5 TM remote sensing images of year 1990,2000 and 2011 to perform surface temperature inversion. To analyze and compare the distribution modes of surface temperature in different period,surface temperature images were further classified using density segmentation method. Flat city areas outside the mountainous region were extracted,and subtraction operation was run between surface temperature images of different period to analyze changes on surface temperature with time. Finally,based on the extracted urban built-up areas,changes on heat island intensity of each city were analyzed by calculating heat island proportion index of each period.