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Urban heat islands (UHIs) are urbanized regions with elevated temperatures compared to their surrounding environments. Dhaka, burdened by a dense population, haphazard urbanization, and intense vehicular activity within limited land space, has emerged as one of the most polluted and conducive environments for UHIs. This investigation aimed to pinpoint UHI hotspots during summer and winter while exploring the relationship between land use patterns and UHI formation. Dhaka City was scrutinized and divided into Dhaka North City Corporation (DNCC) and Dhaka South City Corporation (DSCC). This research utilized spatial data from 2015 to 2022 for April–May and December–January to analyze land surface temperature (LST) employing RS-GIS software, specifically “QGIS 3.22.16”. Landsat 8 Level 2 data facilitated the generation of LST maps, while Sentinel 2 imagery aided in land use classification within UHI zones. The findings revealed UHI coverage of 61.784 km2 in summer and 75.168 km2 in winter, accounting for 20.6% and 25.05% of the total city area, respectively. The evaluation of land use within UHIs indicated a prevalence of built-up infrastructure, which is particularly prominent in DSCC compared to DNCC. Both city corporations exhibited significant deficiencies in green and blue spaces crucial for UHI mitigation. Water bodies and dense vegetation within UHI zones remained below 1% and 5%, respectively. Regression analysis unveiled a robust positive correlation between built-up area and UHI intensity during summer and winter. Consequently, the proliferation of the built-up regions escalated temperatures by absorbing high levels of solar energy, while the dearth of green and blue spaces impeded natural cooling processes, exacerbating UHI effects. This study underscores the detrimental impact of urbanization on temperature regulation in Dhaka City, emphasizing the imperative of balanced urban planning to mitigate UHI phenomena through preserving green spaces and regulating built-up areas.

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Identification of Urban Heat Islands in Dhaka City and Depiction of Their Land Use

  • 会议论文

  • 发表日期：

    2025年

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  • Mahfuzul Islam,
  • Syed Hafizur Rahman

摘要

Urban heat islands (UHIs) are urbanized regions with elevated temperatures compared to their surrounding environments. Dhaka, burdened by a dense population, haphazard urbanization, and intense vehicular activity within limited land space, has emerged as one of the most polluted and conducive environments for UHIs. This investigation aimed to pinpoint UHI hotspots during summer and winter while exploring the relationship between land use patterns and UHI formation. Dhaka City was scrutinized and divided into Dhaka North City Corporation (DNCC) and Dhaka South City Corporation (DSCC). This research utilized spatial data from 2015 to 2022 for April–May and December–January to analyze land surface temperature (LST) employing RS-GIS software, specifically “QGIS 3.22.16”. Landsat 8 Level 2 data facilitated the generation of LST maps, while Sentinel 2 imagery aided in land use classification within UHI zones. The findings revealed UHI coverage of 61.784 km2 in summer and 75.168 km2 in winter, accounting for 20.6% and 25.05% of the total city area, respectively. The evaluation of land use within UHIs indicated a prevalence of built-up infrastructure, which is particularly prominent in DSCC compared to DNCC. Both city corporations exhibited significant deficiencies in green and blue spaces crucial for UHI mitigation. Water bodies and dense vegetation within UHI zones remained below 1% and 5%, respectively. Regression analysis unveiled a robust positive correlation between built-up area and UHI intensity during summer and winter. Consequently, the proliferation of the built-up regions escalated temperatures by absorbing high levels of solar energy, while the dearth of green and blue spaces impeded natural cooling processes, exacerbating UHI effects. This study underscores the detrimental impact of urbanization on temperature regulation in Dhaka City, emphasizing the imperative of balanced urban planning to mitigate UHI phenomena through preserving green spaces and regulating built-up areas.