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Sensors 2008, 8(11), 7453-7468; doi:10.3390/s8117453

Study of the Relationships between the Spatial Extent of Surface Urban Heat Islands and Urban Characteristic Factors Based on Landsat ETM+ Data

1
State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, P. O. Box 1131, Guangzhou, GD 510640, P.R. China
2
Computer School, South China Normal University, Guangzhou, GD 510631, P.R. China
*
Author to whom correspondence should be addressed.
Received: 25 July 2008 / Revised: 11 November 2008 / Accepted: 12 November 2008 / Published: 20 November 2008
(This article belongs to the Section Remote Sensors)
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Abstract

Ten cities with different population and urban sizes located in the Pearl River Delta, Guangdong Province, P.R. China were selected to study the relationships between the spatial extent of surface urban heat islands (SUHI) and five urban characteristic factors such as urban size, development area, water proportion, mean NDVI (Normalized Vegetation Index) and population density, etc. The spatial extent of SUHI was quantified by using the hot island area (HIA). All the cities are almost at the same latitude, showing similar climate and solar radiation, the influence of which could thus be eliminated during our computation and comparative study. The land surface temperatures (LST) were retrieved from the data of Landsat 7 Enhanced Thematic Mapper Plus (ETM+) band 6 using a mono-window algorithm. A variance-segmenting method was proposed to compute HIA for each city from the retrieved LST. Factors like urban size, development area and water proportion were extracted directly from the classification images of the same ETM+ data and the population density factor is from the official census. Correlation and regression analyses were performed to study the relationships between the HIA and the related factors, and the results show that HIA is highly correlated to urban size (r=0.95), population density (r=0.97) and development area (r=0.83) in this area. It was also proved that a weak negative correlation existed between HIA and both mean NDVI and water proportion for each city. Linear functions between HIA and its related factors were established, respectively. The HIA can reflect the spatial extent and magnitude of the surface urban heat island effect, and can be used as reference in the urban planning. View Full-Text
Keywords: Enhanced Thematic Mapper plus (ETM+); Surface urban heat island (SUHI); Land surface temperature (LST); Variance segmenting; Thermal infrared image; Hot island area Enhanced Thematic Mapper plus (ETM+); Surface urban heat island (SUHI); Land surface temperature (LST); Variance segmenting; Thermal infrared image; Hot island area
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Zhang, J.; Wang, Y. Study of the Relationships between the Spatial Extent of Surface Urban Heat Islands and Urban Characteristic Factors Based on Landsat ETM+ Data. Sensors 2008, 8, 7453-7468.

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