Urban Heat Island Monitoring and Analysis Using Landsat ETM+/TM Imageries
In recently years, Urban Heat island (UHI) is one of the hottest topics in urban climate. The present paper discusses heat islands at Guangzhou metropolis, the capital of Guangdong Province in southern China. TM/ETM+ imageries acquired in 1990, 2000, and 2002 are used to retrieval land surface temperature. Firstly, the ETM+/TM imageries are calibrated using parameter header file. Then, the radiance is transformed into brightness temperature and its standard normal distribution. Finally, building method of three dimension urban heat island perspective image is experimented. Comparing images of brightness temperature and its standard normal distribution, it concludes that the higher temperature areas increase year by year. This accordes with the annual average temperatures of Guangzhou increased year by year. The distributions of higher temperature areas concentrate at Yuexiu and Luogang in 1990. However, in 2000, the higher temperature large areas in Luogang are disappeared due to urban greening, and the higher temperature areas spread in other districts. As well as, in 2002, the higher temperature area distributions are dispersion and fragment, so the UHI intensity is mitigated to some degree. Three dimension urban heat island perspective image exhibits heat island distribution visually.
X. P. Wen and X. F. Yang, "Urban Heat Island Monitoring and Analysis Using Landsat ETM+/TM Imageries", Key Engineering Materials, Vols. 467-469, pp. 3-6, 2011