城市不透水面及其与城市热岛的关系研究-以泉州市区为例

利用Landsat TM卫星影像提取了泉州市1989到1996年的城市建成区不透水面,并研究了其与城市热岛之间的关系。根据Ridd(1995)提出的城市建成区不透水面与植被覆盖度有很强的负相关关系的思想,先利用归一化植被指数求出泉州市建成区的植被覆盖度,进而提取了泉州市建成区的不透水面。通过比较所提取的两个时相不透水面信息,可以看出泉州市区不透水面的面积在7年里有了明显的增加,并主要沿研究区东南部扩展。通过将所提取的不透水面信息与利用TM6波段反演的地表温度进行相关分析,可发现二者之间存在着明显的正相关关系。

A Study on Urban Impervious Surface Area and Its Relation with Urban Heat Island: Quanzhou City, China

A remote sensing study on the urban impervious surface and its relation with urban heat island has been carried out taking Quanzhou city of SE China as an example.The remotely-sensed data have been obtained from two Landsat TM images of 1989 and 1996.Ridd(1995) indicated that the impervious surface area(ISA) and the fractional vegetation cover(Fr) have an inversely relation in urban areas.Accordingly,we obtained the spatial patterns of the impervious surface area by calculating fractional vegetation cover derived from the NDVI.The study revealed that the impervious surface area of the study area increased significantly from 1989 to 1996,expanding mainly southeastwards.Furthermore,this paper discussed the quantitative relation between the impervious surface area and the urban heat islands.The land surface temperature has been obtained from band 6 of the Landsat TM images.Based on the regression analysis between the impervious surface area and the land surface temperature,it can be concluded that the impervious surface area has a direct response to the increase of the urban heat island phenomenon.