基于MODIS资料研究广州市热环境

RESEARCH INTO THERMAL ENVIRONMENT IN GUANGZHOU BASED ON MODIS DATA

关键词:  MODIS  城市热环境  推广分裂窗方法  广州市

Key words:  MODIS  Urban Thermal Environment  Revised Split-windows Method  Guangzhou City

摘要:

利用MODIS资料,采用推广分裂窗方法,对广州市热环境进行研究。通过实测数据与反演数据进行比较分析,表明该方法的数据精度基本满足研究要求。研究结果表明,广州市的高温区主要发生在荔湾、越秀、海珠、黄埔、天河等城区,这些区域建筑密集、人口集中、下垫面升温快;低温区域多发生在植被覆盖度高、水系分布密集、人为活动较为稀少的郊区。保护现有的水体面积和增加城市绿地面积是改善区域热环境的行之有效的办法。

Abstract:

The paper uses MODIS data and the split-windows method to research into the thermal environment of Guangzhou City. Comparing the land surface temperature retrieved from MODIS data with the meteorological measurement data shows that the data precision through the split-windows method basically satisfies the research requirement. The result shows that most high-temperature regions are urban districts,such as Liwan,Yuexiu,Haizhu,Huangpu and Tianhe,which have dense buildings,concentrated population and underlying land surface that is rapidly heated. Most low-temperature regions are suburban areas with good vegetation,dense river system,and few human activities. An effective method to improve the regional thermal environment is to protect the area of existing water and increase the greenbelt of the city.