Comparative Study of Factors Contributing to Land Surface Temperature in High-Density Built Environments in Megacities Using Satellite Imagery

Frankie Fanjie Zeng, Jiajun Feng, Yuanzhi Zhang, Jin Yeu Tsou, Tengfei Xue, Yu Li and Rita Yi Man Li
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Frankie Fanjie Zeng: School of Marine Science, Nanjing University of Information Science and Technology, Nanjing 210044, China
Jiajun Feng: School of Marine Science, Nanjing University of Information Science and Technology, Nanjing 210044, China
Yuanzhi Zhang: School of Marine Science, Nanjing University of Information Science and Technology, Nanjing 210044, China
Jin Yeu Tsou: Center for Housing Innovations and Institute of Asia-Pacific Studies, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
Tengfei Xue: EarthStar Inc., Beijing 100101, China
Yu Li: Faculty of Information Science, Beijing University of Technology, Beijing 100124, China
Rita Yi Man Li: Department of Economics and Finance/Sustainable Real Estate Research Center, Hong Kong Shue Yan University, Hong Kong, China

Sustainability, 2021, vol. 13, issue 24, 1-14

Abstract: In this study, the root sources contributing to the urban heat island (UHI) effect between megacities, such as Hong Kong and Shenzhen, were integrated and compared using satellite remote sensing data. Classification and multilayer perceptron regression tree (CARTMLP) algorithms were used to classify land use. The radiative transfer equation method was applied to retrieve the land surface temperatures (LSTs) in the study area. Multiple linear regression analysis was applied to determine the relationship between land-use types and UHIs. The experimental results show a large area of relatively high temperature dispersed within Shenzhen, and comparatively small areas highly centralized in Hong Kong, with the retrieved LST in Hong Kong lower than that in Shenzhen. In addition, the surface temperature of large complex buildings decorated with high-albedo materials in Hong Kong was higher than in Shenzhen (e.g., Hong Kong International Airport, 25.12 °C; Shenzhen Bao’an International Airport, 23.38 °C), with artificial heat being an important contributor to these differences. These results also imply that high-albedo materials are sufficient to alleviate high temperatures. These findings are integrated to propose an organic combination strategy for reducing UHI effects in urban areas in megacities worldwide, such as Hong Kong and Shenzhen in China.

Keywords: urban heat islands; megacities; high-density built environment; surface temperature; satellite images (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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