成都市城市演变对热岛效应的影响分析

Analysis of Impact of Urban Development on Heat Island Effect in Chengdu City

将高、低分辨率卫星遥感数据相结合,使用成都市2001和2006年的同期卫星遥感数据,通过CBERS/CCD(中巴地球资源卫星/CCD相机)的多光谱信息获取植被指数图,并结合三波段数据合成彩色图像以及全色图,采用人机交互式方式提取城市建成区信息;对NOAA/AVHRR(美国国家海洋大气局/改进的甚高分辨率扫描辐射计)的热红外信息进行亮温反演和空间重采样,结合城市调查资料得到如下结果:(1)城市热岛(UHI)的范围随城市扩展而增大,新兴工、商业区成为新的高温中心区;(2)UHI规模的扩张与市区人口数量增长呈正相关;(3)中心城区西部绿化面积增多对热岛效应的缓解作用,使局部地方温度较低;(4)东郊工业区搬迁和功能区调整等城市改造措施是UHI特点改变的促进因素。

Through multi-spectral information captured by CBERS/CCD combined with synthetic color images of 3-waverange data and full-color image,the information of the existing urban areas was extracted in a human-computer interactive way by means of obtaining index graph of vegetation area.With the result of relevant survey,brightness temperature of MOAA/AVHRR’s thermal infrared info was inverted and the space re-sampled.The analysis concluded that urban heat island（UHI）expanded with the urban area expansion and the new emerging commercial areas has become the center of hightemperature.Expansion of UHI was positively correlated with the booming urban population.The increase of some vegetation areas in the west downtown could somehow appease the UHI effect;and proper re-adjustment of the functional zone could help mitigate UHI,e.g,relocation of the East-suburban Industrial Park.