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<p>The term ‘urban’ refers to anything associated with cities or densely populated areas. In many cases, it is used to describe the characteristics, way of life, and issues unique to urban areas. Cities are known for their dense populations, extensive infrastructure, and diverse range of social, cultural, and economic activities. The most significant urban environmental problem was the urban heat island study, and cities all over the world were facing disastrous conditions as a result of urbanization, industry, population pressure on the transportation system, and climate change. Chennai, the capital of Tamil Nadu, India, has experienced rapid urbanization and growth in recent decades. The use of remote sensing and geospatial tools to identify the urban heat island in the Chennai Region. Normalized difference vegetation index (NDVI), normalized difference built-up index (NDBI), land surface temperature (LST), urban thermal field variance index (UTFVI), and urban heat island (UHI) are just a few of the components that have been studied over the last four decades, from 1990 to 2020. NDVI values show that healthy vegetation decreased steadily, from 0.575 in 1990 to 0.554 in 2020. Similarly, NDBI values revealed a sharp rise in built-up areas, with values increasing from –0.428 in 1990 to 0.234 in 2020. LST analysis indicated a significant increase in land surface temperatures, rising from 21.85°C in 1990 to 43.28°C in 2020. UTFVI and UHI analyses also demonstrated a progressive intensification of urban thermal effects over the decades. Overall, the evidence highlights the adverse environmental impacts of urbanization on the Chennai Region’s climate, emphasizing the need for sustainable urban planning practices. This study’s comprehensive approach, integrating multiple indices, provides detailed insights into the dynamic interplay between urbanization, vegetation, and thermal effects, offering valuable recommendations for mitigating urban heat island impacts. These findings provide a comprehensive understanding of the urban heat island (UHI) effect, enabling the development of sustainable urban planning strategies. By addressing vegetation loss, rising land surface temperatures, and increased built-up areas, targeted mitigation efforts can promote environmental resilience.</p>

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Analysis of urban heat island by using remote sensing techniques and geo-spatial approach in Chennai Region, Tamil Nadu, India

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • S Sethuraman,
  • Haya Mesfer Alshahrani,
  • Faiz Abdullah Alotaibi,
  • M Vadivel,
  • Vivek Sivakumar

摘要

The term ‘urban’ refers to anything associated with cities or densely populated areas. In many cases, it is used to describe the characteristics, way of life, and issues unique to urban areas. Cities are known for their dense populations, extensive infrastructure, and diverse range of social, cultural, and economic activities. The most significant urban environmental problem was the urban heat island study, and cities all over the world were facing disastrous conditions as a result of urbanization, industry, population pressure on the transportation system, and climate change. Chennai, the capital of Tamil Nadu, India, has experienced rapid urbanization and growth in recent decades. The use of remote sensing and geospatial tools to identify the urban heat island in the Chennai Region. Normalized difference vegetation index (NDVI), normalized difference built-up index (NDBI), land surface temperature (LST), urban thermal field variance index (UTFVI), and urban heat island (UHI) are just a few of the components that have been studied over the last four decades, from 1990 to 2020. NDVI values show that healthy vegetation decreased steadily, from 0.575 in 1990 to 0.554 in 2020. Similarly, NDBI values revealed a sharp rise in built-up areas, with values increasing from –0.428 in 1990 to 0.234 in 2020. LST analysis indicated a significant increase in land surface temperatures, rising from 21.85°C in 1990 to 43.28°C in 2020. UTFVI and UHI analyses also demonstrated a progressive intensification of urban thermal effects over the decades. Overall, the evidence highlights the adverse environmental impacts of urbanization on the Chennai Region’s climate, emphasizing the need for sustainable urban planning practices. This study’s comprehensive approach, integrating multiple indices, provides detailed insights into the dynamic interplay between urbanization, vegetation, and thermal effects, offering valuable recommendations for mitigating urban heat island impacts. These findings provide a comprehensive understanding of the urban heat island (UHI) effect, enabling the development of sustainable urban planning strategies. By addressing vegetation loss, rising land surface temperatures, and increased built-up areas, targeted mitigation efforts can promote environmental resilience.