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Climate 2018, 6(3), 56; https://doi.org/10.3390/cli6030056

The Effect of Building Facades on Outdoor Microclimate—Reflectance Recovery from Terrestrial Multispectral Images Using a Robust Empirical Line Method

1
Faculty of Built Environment, The University of New South Wales (UNSW), Sydney NSW 2052, Australia
2
CRC for Low Carbon Living Ltd, Tyree Energy Technology Building—UNSW, Sydney NSW 2052, Australia
3
School of Architecture and Built Environment, The University of Adelaide, Adelaide SA 5005, Australia
*
Author to whom correspondence should be addressed.
Received: 6 June 2018 / Accepted: 21 June 2018 / Published: 25 June 2018
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Abstract

Climate change and the urban heat island effect pose significant health, energy and economic risks. Urban heat mitigation research promotes the use of reflective surfaces to counteract the negative effects of extreme heat. Surface reflectance is a key parameter for understanding, modeling and modifying the urban surface energy balance to cool cities and improve outdoor thermal comfort. The majority of urban surface studies address the impacts of horizontal surface properties at the material and precinct scales. However, there is a gap in research focusing on individual building facades. This paper analyses the results of a novel application of the empirical line method to calibrate a terrestrial low-cost multispectral sensor to recover spectral reflectance from urban vertical surfaces. The high correlation between measured and predicted mean reflectance values per waveband (0.940 (Red) < rs > 0.967 (NIR)) confirmed a near-perfect positive agreement between pairs of samples of ranked scores. The measured and predicted distributions exhibited no statistically significant difference at the 95% confidence level. Accuracy measures indicate absolute errors within previously reported limits and support the utility of a single-target spectral reflectance recovery method for urban heat mitigation studies focusing on individual building facades. View Full-Text
Keywords: urban heat mitigation; albedo; cool facades; spectral reflectance; urban remote sensing; empirical line method; building scale urban heat mitigation; albedo; cool facades; spectral reflectance; urban remote sensing; empirical line method; building scale
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Fox, J.; Osmond, P.; Peters, A. The Effect of Building Facades on Outdoor Microclimate—Reflectance Recovery from Terrestrial Multispectral Images Using a Robust Empirical Line Method. Climate 2018, 6, 56.

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