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Journal of Applied Remote Sensing

Effective surface areas for optimal correlations between surface brightness and air temperatures in an urban environment
Author(s): Huade Guan; Andrew J. McGrath; Roger Clay; Cäcilia Ewenz; Simon Benger; John Bennett
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Paper Abstract

We perform correlation analysis between air temperature and surface brightness temperature over the Adelaide Central Business District and the surrounding parklands. The results indicate that three effective surface areas associated with three different mechanisms exist. They are the effective surface area with upward sensible heat transfer to heat up and maintain the air temperature, the effective surface area with downward sensible heat transfer to cool down the air, and the effective surface area related to very localized conditions (e.g., sky-view factors). The three mechanisms occur at different times of the day and result in different air temperature and surface temperature correlations. The first effective surface area exists in the daytime after the surface is heated up by solar radiation and can persist into the night, particularly in urban environments. The second effective area occurs in night-time when the surface has been cooled down sufficiently. The third effective area coexists with the second one and has a weaker correlation between the surface and air temperatures. It was also found that in an urban area, exclusion of roof pixels in the calculation of surface brightness temperature can increase the correlation between the surface and air temperatures in the middle of the night.

Paper Details

Date Published: 28 April 2015
PDF: 16 pages
J. Appl. Remote Sens. 9(1) 096059 doi: 10.1117/1.JRS.9.096059
Published in: Journal of Applied Remote Sensing Volume 9, Issue 1
Show Author Affiliations
Huade Guan, Flinders Univ. (Australia)
National Ctr. for Groundwater Research and Training (Australia)
Andrew J. McGrath, Flinders Univ. (Australia)
(Australia)
Roger Clay, The Univ. of Adelaide (Australia)
Cäcilia Ewenz, Flinders Univ. (Australia)
Simon Benger, Flinders Univ. (Australia)
John Bennett, Flinders Univ. (Australia)


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