基于MODIS 数据的南京市夏季城市热岛分析

城市热岛效应是当前城市环境与气候主要研究内容之一。地表温度与气温之间有紧密的联系, 通过遥感反演地表温度已成为研究城市热岛的有效手段。利用MODIS 数据, 获取地表比辐射率与大气透过率2 个基本参数, 运用劈窗算法反演南京市夏季地表温度。基于不同时相的MODIS数据, 对4 幅南京市地表温度反演图像作对比分析, 较好地显示了南京市城市热岛的空间分布、热岛范围和城市热岛强度, 结果表明南京市夏季热岛问题较为严重。

A Study of Urban Heat Island in Summer of Nanjing Based on MODIS Data

Urban heat island is one of the most important research Contents in city environment and climate.Land surface temperature and air temperature is associated,we can get land surface temperature by remote sensing data,and it becomes one of the most important ways to research urban heat island.In this text,based on MODIS data,we calculate two important parameters: the surface emissivity and the atmospheric transmittance,then the land surface temperature of Nanjing is calculated by means of a split-window method.Based on different temporal MODIS data,the four temporal land surface temperature scenes were contrasted,it shows the area,distribution and intensity of heat island of Nanjing,the research result shows that urban heat island effect is very serious in Nanjing city.