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Effects of rapid urbanisation on the urban thermal environment between 1990 and 2011 in Dhaka Megacity, Bangladesh

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Open access
Authors
Trotter, L.
Dewan, A.
Robinson, Todd
Date
2017
Type
Journal Article

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Trotter, L. and Dewan, A. and Robinson, T. 2017. Effects of rapid urbanisation on the urban thermal environment between 1990 and 2011 in Dhaka Megacity, Bangladesh. AIMS Environmental Science. 4 (1): pp. 145-167.
Source Title
AIMS Environmental Science
DOI
School
Department of Spatial Sciences
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This is a pre-copy-editing, author-produced PDF of an article accepted for publication in AIMS Environmental Science following peer review. The definitive publisher-authenticated version Trotter, L. and Dewan, A. and Robinson, T. 2017. Effects of rapid urbanisation on the urban thermal environment between 1990 and 2011 in Dhaka Megacity, Bangladesh. AIMS Environmental Science. 4 (1): pp. 145-167 is available online at: http://www.aimspress.com/article/10.3934/environsci.2017.1.145

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Abstract

This study investigates the influence of land-use/land-cover (LULC) change on land surface temperature (LST) in Dhaka Megacity, Bangladesh during a period of rapid urbanisation. LST was derived from Landsat 5 TM scenes captured in 1990, 2000 and 2011 and compared to contemporaneous LULC maps. We compared index-based and linear spectral mixture analysis (LSMA) techniques for modelling LST. LSMA derived biophysical parameters corresponded more strongly to LST than those produced using index-based parameters. Results indicated that vegetation and water surfaces had relatively stable LST but it increased by around 2 °C when these surfaces were converted to built-up areas with extensive impervious surfaces. Knowledge of the expected change in LST when one land-cover is converted to another can inform land planners of the potential impact of future changes and urges the development of better management strategies.