Abstract:

The spatial layout of urban heatisland can reflect the success or failure of urban planning and management to some extent, and it is one of the drivers of urban air pollution too.According to the NOAA/AVHRR（National Oceanic and Atmospheric Administration/Advanced Very High Resolution Radiometer）data on the afternoon of February and March in Chengdu City (2000,2003,2004,2006,2008 and 2010),the inversion of brightness temperatures introduced the mean and sigma method to divide the intensity of heatisland into seven levels,and the area weighted average method to divide the intensity of research region into three kinds:high,medium and low temperatures.The results indicated that:(1).the spatial layout changed greatly,the centershaped in prophase changed into the annularshaped in metaphase, and the anaphase was an adjustment phase of highisland shape and hightemperature center;(2).the intensity of research region was high in prophase,then weakens in 2004 in which the intensity of hightemperature decreases by 2.59℃ compared with 2003,and the average decreasing rate after 2004 was only 024℃ per year;(3).the temperature gradient of urban northeast and southwest showed reverse rising and lowering.Since surface temperature plays an important role in urban temperature,the shape change of heatisland is an objective evidence for us to analyze the mechanism of air pollution,the design of heatisland data model,and the urban planning more finely