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Urban heat island (UHI) spatiotemporal pattern in comparison with NDBI before–after COVID-19 pandemic in Sleman Regency, Indonesia

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Abstract

Urban growth is known to be the main factor of urban heat islands (UHI), an important indicator of global warming. However, another anomaly was where the temperature decreased without reducing the urban settlement during the COVID-19 pandemic. This study aims to compare the UHI in the Sleman Regency in contrast to urban growth and the COVID-19 pandemic time-lapse result through the pattern using Geographic Information System (GIS) and Remote Sensing (RS). Sleman Regency, Yogyakarta, Indonesia, was the area of interest for the case study in 2018, 2020, and 2022. In this research, the author observed the pattern of UHI following urbanization in a region that grows as a study and tourism destination in Indonesia. Landsat TIRS level 2 product has an ST (surface temperature) band that had been corrected using TOA reflectance, TOA brightness temperature, ASTER global emissivity dataset and ASTER NDVI data, and atmospheric profiles of geopotential height, specific humidity, and air temperature extracted from reanalysis data. The land surface temperature (LST) data were converted in Celcius to be extracted into the spatiotemporal model of UHI for the Sleman Regency. Moran’s index spatial autocorrelation showed the temporal variation of the UHI and built-up areas in the Sleman area during the chosen time. While the built-up area presented 0,21% growth from 2018 to 2022 based on NDBI, the UHI in the Sleman Regency was depleted by approximately 50% in 2020. However, the UHI nearly doubled by approximately 49,17% by 2022, after the pandemic. This result depicts another factor of land surface temperature other than urbanization. Human activity related to transportation during the pandemic lockdown indicated the influence of gas emissions on the land surface temperature.

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Acknowledgements

The author would like to acknowledge the Central Agency on Statistics of Indonesia for the open-access statistical data that were needed in this study. The author was also grateful to Geospatial Information Agency Indonesia and Fajrun Wahidil Muharram for supporting data to enhance the regional analysis.

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Correspondence to Maya Indah Sari.

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Sari, M.I. Urban heat island (UHI) spatiotemporal pattern in comparison with NDBI before–after COVID-19 pandemic in Sleman Regency, Indonesia. Model. Earth Syst. Environ. 10, 2855–2867 (2024). https://doi.org/10.1007/s40808-023-01924-x

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  • DOI: https://doi.org/10.1007/s40808-023-01924-x

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