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基于遥感数据的东莞市热岛效应分析研究

基于遥感数据的东莞市热岛效应分析研究

摘 要

东莞市是东南沿海经济迅速发展的代表城市之一，为保障城市健康发展，改善城市人居环境，很有必要对其城市热岛效应现状展开研究。

本文借助NASA提供的网站获取东莞市大气剖面参数，再使用ENVI对Landsat 8卫星遥感数据进行地表温度反演，计算出东莞市夏季和冬季的热岛强度，同时使用ENVI分析出东莞市土地利用分类数据与植被覆盖率数据，研究它们与东莞市热岛的相关性，主要研究结论如下：

1) 东莞市全年都存在较高强度的热岛效应。从季节上看，夏季热岛强度高于冬季；

从区域上看，西南部区域热岛强度高于东北部区域。

2) 不同土地利用类型的温度存在如下梯度关系：城市用地＞荒地＞草地/田地＞水域

＞林地。

3) 植被覆盖率与温度存在明显的负相关性，相关系数达0.7975。即植被覆盖率越高

的区域温度越低，且植被覆盖率较高的区域热岛范围相对较小。 关键词：热岛效应； 热岛强度； 东莞市； ENVI； Landsat 8； 温度反演

Using Remote Sensing Data Analysis Urban Heat Island

Effect in Dongguan

ABSTRACT

Dongguan is one of the rapid economic development city, to ensure the healthy development of the city , improve the urban living environment, it is necessary to conduct in-depth study of its status of UHI.

With the help of cross-sectional parameters of atmospheric NASA established acquisition model, we can use ENVI analyses the Landsat 8 satellite remote sensing data, surface temperature retrieval, calculate the heat island intensity in summer and winter of Dongguan, and further analysis the land use type and vegetation coverage data in Dongguan, the main conclusions are as follows:

1) There is an UHI in Dongguan. From the season point of view, the summer heat island

intensity is higher than that in winter; from the regional perspective, the southwest regional heat island intensity is higher than the northeast regional.

2) Various land use types of temperature gradient has the following relationship: Urban

land> wasteland> grassland / farmland> waters> woodland.

3) The vegetation coverage rate significantly negative correlation with temperature,

correlation coefficient reached 0.7975. That is, the higher the vegetation coverage, the lower the temperature. Moreover, the regional heat island areas with higher vegetation coverage is relatively small.

Keywords：UHI; heat island intensity; Dongguan; ENVI; Landsat 8; temperature retrieval