摘要
位于珠江三角洲的广州市在城市化进程的推动下,城市空间快速扩展.本文利用1990年、2000年、2008年的Landsat遥感影像对广州市的城市扩展及其热环境效应进行了分析,采用IBI建筑指数和NDVI植被指数分别获取了建筑用地和植被信息,然后讨论了城市热环境与这些地表参数的定量关系.结果发现广州市建筑用地与地表温度呈指数型正相关关系,高比例建筑用地地区的升温要比低比例建筑用地地区大0.3℃;而植被则对地表温度起降温作用.总的看来,尽管1990年～2008年间广州城市建成区的面积持续扩张,但是其城市热岛效应并不是一直在增强,而是呈现出先增强后减弱的趋势.
Driven by the urbanization process,Guangzhou city located in the Pearl River Delta has experienced a rapid urban expansion.Multitemporal Landsat TM/ETM+images of 1990,2000,and 2008were used to analyze the urban expansion and thermal environment effect in Guangzhou's urban area and examine the quantitative relationship between urban thermal environment and various urban biophysical components.This paper applies Index-based Built-up Index(IBI)and Normalized Difference Vegetation Index(NDVI)to retrieve the information of built-up and vegetation,respectively.Regression statistics reveal that built-up land has a positive exponential relationship with land surface temperature(LST),the areas with high built-up percentage will accelerate the LST rise by 0.3℃ higher than the areas with low built-up percentage.While,vegetation has a negative linear relationship with LST.On the whole,although the built-up area in Guangzhou has expanded continuously between 1990and 2008,urban heat island effect has not always been enhanced,which strengthened first and then weakened.
出处
《遥感信息》
CSCD
2014年第1期23-29,共7页
Remote Sensing Information
基金
国家科技支撑项目(2013BAC08B01)
福建省自然科学基金项目(2011Z01269)
关键词
城市热岛
URI
城市扩展
遥感
广州
urban heat island
URI
urban expansion
remote sensing
Guangzhou
