Spatio-temporal exploratory analysis of urban surface temperature field in Shanghai, China |
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Authors: | Xiaoyan Dai Zhongyang Guo Liquan Zhang Dan Li |
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Institution: | (1) State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 200062 Shanghai, People’s Republic of China;(2) Department of Geography, Key Laboratory of Geographic Information Science, Ministry of Education, East China Normal University, 200062 Shanghai, People’s Republic of China;(3) School of Electrical Engineering and Information, Anhui University of Technology, 243002 Ma’anshan, People’s Republic of China |
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Abstract: | The integrated application of remote sensing, geographic information system and quantitative analytical modeling can provide
scientific and effective methods for monitoring and studying urban heat island, based on land surface temperature (LST) retrieved
from thermal infrared channel data of sensors. In this paper, LST is retrieved from Landsat TM6 and ETM + 6 data of Shanghai
central city in 1989, 1997, 2000 and 2002, by using the mono-window algorithm. Based on the data, global and local spatial
autocorrelation analysis, and geostatistical methods are adopted to quantitatively describe the characteristics of spatial
heterogeneity and temporal evolution of land surface thermal landscape at different scales and periods in Shanghai central
city, by utilizing exploratory spatial data analysis. Results show that LST field in Shanghai central city tends to fragmentize
and complicate with the development of Shanghai, and its global spatial difference becomes greater gradually. The spatial
variance pattern of the change of LST field from 1997 to 2002 indicates that the dynamic change of LST presents a tendency
of increase in circularity. LST declines distinctly in the districts of Puxi and Pudong near and inside the inner ring road,
while it rises obviously outside the central city and near the out ring road. The extrema of temporal change in LST field
have a characteristic of spatial clustering. Besides, as the city of Shanghai expands in a circular pattern as a whole, the
directional difference of dynamic change of urban surface thermal landscape exists but is not very obvious. |
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