南京市热岛效应及效应响应分析

Study on Urban Heat Island in Summer of Nanjing Based on TM Data

利用南京市2003年TM影像,通过单窗算法提取地表温度信息,总结出南京市热岛分布状况,找出影响较广泛的热岛集聚区。并利用NDVI指数和NDBI指数分别对南京市区进行绿地和建筑用地的提取,分析南京市热岛空间分布特点以及用地各专题信息和热岛分布的相关性。结果显示,南京市区的热岛区多分布在城市下垫面为硬地面,人口或工业密集地区,并且,建筑用地内的植被对于降低地面温度比绿地更明显。

Heat island effect is an important program for research of urban environment and climate. In this paper, based on TM data of Nanjing of 2003,mono-window algorithm is used to extract the temperature information of urban surface. And next, we can get the condition of heat islands distributing, also find out the masses of heat islands which have far-reaching effects on the environment and climate. On the other hand, based on NDBI and NDVI exponents, the buildings and green space information is extracted in order to analyze the relativity between heat islands distributing and the land exploiting. We can draw a conclusion that the heat islands most are located where the underground surface is hard one and has a dense population or high developed industry. Meanwhile,vegetation surrounded by the buildings are playing a more patent role on decrease the surface temperature than grass spaces.