Abstract
Green space in cities has been reducing rapidly due to the intensive urban expansion, which contributes to surface temperature growth, leading to numerous challenges in management and planning. This work applied U-Net and cellular automaton-artificial neural network (CA-ANN) models to classify and predict the land use and land cover (LULC) change in Ho Chi Minh, the largest city in Vietnam. The present study indicates that the LULC in this city has changed remarkedly for 27 years when the urban green space (UGS) performed a gradual decline. The urban expansion is mainly in the north and northeast direction. The UGS and temperature are negatively correlated since the UGS decline contributes to a temperature increase from 1995 to 2022 in the study area. The temperature is high in all urban areas, being highest in industrial zones or areas with manufacturing activities. There is a different picture of temperature between the inner-city area and the other areas according to the density of green spaces. Based on the CA-ANN model, this work can predict the LULC change in 2035 as the urban land will increase, but the UGS will reduce and the expansion direction being to the east, northeast and northwest. Our findings suggest that remote sensing and U-Net models may be used to investigate urban heat islands and urbanization, as well as to analyze geographical and temporal changes. These results would be helpful for planners and managers to pay more attention to long-term plans for sustainable urban development and management in this city.
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Acknowledgements
The authors thank anonymous reviewers for their helpful comments and suggestions, which improved this manuscript. We would like to thank Dr. Ngoc Minh Nguyen for his thoughtful comments on the revised manuscript.
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ANTD was contributed to methodology, formal analysis, writing—review and editing, validation. HDT was contributed to data curation, formal analysis, writing—review and editing. TATD was contributed to methodology, investigation, writing—original draft.
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Do, A.N.T., Tran, H.D. & Do, T.A.T. Impacts of urbanization on heat in Ho Chi Minh, southern Vietnam using U-Net model and remote sensing. Int. J. Environ. Sci. Technol. 21, 3005–3020 (2024). https://doi.org/10.1007/s13762-023-05118-x
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DOI: https://doi.org/10.1007/s13762-023-05118-x