Urban heat island (UHI) is an important feature of urban thermal environment. In order to detect the seasonal
characteristics of urban heat island in Beijing city, Landsat 5 TM images acquired on July 25th 2005, November 14th
2005, and April 7th 2006 respectively were used to retrieve land surface temperature (LST) of Beijing city based on the
generalized single channel algorithm which is a new algorithm applicable to retrieve land surface temperature from only
one thermal infrared channel. Then seasonal urban thermal environmental characteristics were analyzed. The result
shows that in summer the urban heat island phenomenon is evident, and in both winter and spring, land surface
temperature within the second ring road is obviously higher than that between the second and the fourth ring roads
showing the ring-shaped UHI features, which is in accordance with the ring-road system of Beijing city. But areas
outside the fourth ring road show lighter tone (meaning higher temperature) in the land surface temperature distribution
map of winter and spring and reasons for this abnormity were given.
Urban heat island (UHI) is a key feature of urban climate. In order to compare the urban heat island phenomenon of
Beijing city between summer and winter, Landsat 5 TM images acquired on August 31st 2001 and December 21st 2001
respectively were used to retrieve land surface temperature (LST) of Beijing city based on the generalized single channel
algorithm which is a new algorithm applicable to retrieve land surface temperature from only one thermal channel
remote sensing image. Then seasonal urban thermal environmental changes were analyzed. The result shows that urban
heat island exists in both winter and summer and distribution maps of urban thermal environment are both ring-shaped,
which is in accordance with the ring-road system of Beijing city. The result also indicates abnormity exists in the
outskirts in winter and reasons for this phenomenon were found.
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