Analyzing the Relationship of LST with MNDWI and NDBI in Urban Heat Islands of Hyderabad City, India

2022 ◽  
pp. 241-258
Author(s):  
Subhanil Guha ◽  
Himanshu Govil
Keyword(s):  
Urban Heat Islands ◽  
Heat Islands ◽  
Urban Heat ◽  
Relationship Of ◽  
The Relationship

scholarly journals Quantifying the effect of waterways and green areas on the surface temperature

2017 ◽  
Vol 39 (1) ◽  
pp. 89 ◽  
Author(s):  
Elis Dener Lima Alves
Keyword(s):  
Surface Temperature ◽  
Temporal Variability ◽  
Urban Heat Islands ◽  
Landsat 8 ◽  
Natural Area ◽  
Heat Islands ◽  
Green Areas ◽  
Urban Heat ◽  
Cooling Effects ◽  
The Relationship

The cooling effects of urban parks and green areas, which form the “Park Cool Island” (PCI) can help decrease the surface temperature and mitigate the effects of urban heat islands (UHI). Therefore, the objective of this research was to know the temporal variability of PCI intensity, as well as analyze the factors that determines it and propose an equation to predict the PCI intensity in Iporá, Goiás State, Brazil. To this purpose, the PCI intensity values were obtained using the Landsat-8 satellite (band 10), and then correlated with the NDVI and the LAI, in which proposes equations through multiple linear regression to estimate the PCI intensity. The results indicated that: 1) the greater the distance of the natural area, greater the surface temperature; 2) there is a great seasonality in PCI, in which the intensity of PCI is much higher in the spring (or close to it); 3) the relationship between NDVI and LAI variables, showed good coefficients of determination; 4) the equations for the buffer of 200 and 500 m, had low RMSE with high coefficients of determination (r2 = 0.924 and r2 = 0.957 respectively). 

scholarly journals Visualising a comparison of simulated urban heat islands: a case study of two Slovakian cities

2019 ◽  
Vol 1 ◽  
pp. 1-8 ◽  
Author(s):  
Ján Feranec ◽  
Juraj Holec ◽  
Pavel Šťastný ◽  
Daniel Szatmári ◽  
Monika Kopecká
Keyword(s):  
Urban Heat Islands ◽  
Heat Island ◽  
Urban Fabric ◽  
Temperature Changes ◽  
Heat Islands ◽  
Computer Animations ◽  
Urban Heat ◽  
The Relationship

<p><strong>Abstract.</strong> Temperature increases in cities affects inhabitants’ quality of life, justifying the extent of research focusing on identifying, analysing, and assessing the relationship between the density of urban fabric represented by land cover/land use (LC/LU) classes and manifestation of the urban heat island (UHI) phenomenon. This paper delimits LC/LU classes for the urban Bratislava (2,117&amp;thinsp;ha of class 12110 dominated in 2016) and Trnava (598 ha of class 12120 dominated in 2016). The greatest median air temperature over 33&amp;thinsp;&amp;deg;C (at 18:00) was derived with the MUKLIMO model for the class <i>Continuous urban fabric with the sealing degree &amp;gt;&amp;thinsp;80%</i> in Bratislava. The graphic outputs improve our perception and evaluation of the LC/LU and UHI relationship. The information potential of the graphical outputs may increase through use of computer animations to represent the temperature changes during day or the temperature changes among years.</p>

scholarly journals Variações Termo-Higrométricas e Estudo de Ilha de Calor Urbana na Cidade de Bragança-PA e Circunvizinhança (Thermo-Hygrometric Variations and Study of Urban Heat Island in the City of Bragança-PA and Surrounding Region)

2016 ◽  
Vol 9 (2) ◽  
pp. 571
Author(s):  
Abnoã Da Costa Costa ◽  
Hernani Rodrigues ◽  
Jefferson Costa ◽  
Paulo Souza ◽  
Joao Silva Junior ◽  
...  
Keyword(s):  
Air Temperature ◽  
Meteorological Parameters ◽  
Heat Island ◽  
Urban Centers ◽  
Heat Islands ◽  
Urban Heat ◽  
Relationship Of ◽  
The Relationship ◽  
The City

Estudou-se algumas variáveis e parâmetros meteorológicos no período de 17 a 21 de novembro de 2014, na cidade de Bragança-PA e circunvizinhança, com a finalidade de entender como elas interferem no microclima da cidade e com isso fazer um estudo com a finalidade de obter uma breve característica do microclima na região. Os resultados mostraram que houveram diferenças de temperaturas entre os pontos, ou seja, algumas características de cada local influenciaram no aumento ou diminuição da temperatura do ar. A relação dos dados com as características de uso e ocupação do solo demonstrou uma influência significativa onde havia vegetação, devido a diminuição da temperatura do ar noturna e, consequentemente, minimização das ilhas de calor. Foi verificado também que as áreas com maior ocupação com construções e com maior pavimentação perderam menos calor, levando à formação de pequenas ilhas de calor noturnas mais intensas. Assim percebeu-se que na cidade, bem como aquelas que passaram por processos de urbanização, segundo literatura, possuem ilha de calor, que consiste em temperaturas mais elevadas durante a noite, causando assim o desconforto humano. Com isso, as alterações microclimáticas na cidade de Bragança-PA, assim como em outros centros urbanos, em geral são causadas pela ação antrópica e que interferem na qualidade de vida da população. Este trabalho é importante para a publicação nesta revista devida a sua contribuição cientifica para a sociedade.     A B S T R A C T We studied some variables and meteorological parameters in the period from 17 to 21 November 2014 in the city of Bragança-PA and surrounding region, in order to understand how they impact on the city's microclimate and thus make a study for the purpose of get a brief characteristic of the microclimate in the region. The results showed that there were differences in temperature between the points, that is, some features of each local influence on the increase or decrease of air temperature. The relationship of the data with the characteristics of use and land cover showed a significant influence where there was vegetation, because influenced the decrease in the night air temperature and thus minimize heat islands. It was also found that the areas with higher occupancy with buildings and more paving lost less heat, leading to the formation of smaller more intense nocturnal heat islands. So it was noticed that in the city, as well as those who have gone through processes of urbanization, according to literature, have heat island, consisting of higher temperatures during the night, thus causing certain human discomfort. With that, the microclimate changes in the city of Bragança-PA, as well as other urban centers in general are caused by human activities that interfere with people's quality of life. This work is important for publication in the magazine due to their scientific contribution to society Keywords: Bragança-PA, heat island, air temperature.   

scholarly journals Bogor Botanic Gardens as a nature-based solution for mitigating urban heat island and microclimate regulation

2021 ◽  
Vol 914 (1) ◽  
pp. 012050
Author(s):  
E M D Rahayu ◽  
S Yusri
Keyword(s):  
Land Surface ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Google Earth ◽  
Urban Heat Islands ◽  
Landsat 8 ◽  
Botanic Gardens ◽  
Heat Islands ◽  
Urban Heat ◽  
Relationship Of

Abstract This paper explores the role of Bogor Botanic Gardens (BBG) as a form of Nature-Based Solution (NBS) to mitigate Urban Heat Islands (UHI). Time series analysis of LANDSAT 8 OLI thermal band and Normalized Difference Vegetation Index (NDVI) was done from 2013 to 2020 using Google Earth Engine. Land Surface Temperature (LST) from Bogor and BBG were calculated, compared, and annual UHI areas were derived. The relationship of LST and NDVI were also explored annually to describe the effect of vegetation towards LST with linear regression. Overall, Bogor experiences a decrease of mean LST from 30.67°C and a maximum of 39.14°C in 2013 to 27.07°C and a maximum of 34.35°C in 2020. However, the inside of BBG is cooler with temperature ranging from 28.41°C and a maximum of 35.62°C in 2013 to 24.25°C and a maximum of 29.41°C in 2020. This is an effect of vegetation inside the BBG that regulate microclimate in its surrounding. It can be seen in the negative correlation between NDVI and LST observed with r2 ranging from 0.27 to 0.82. While UHI areas tended to increase from 8220 ha in 2013 to 8926 ha in 2020, BBG consistently acts as an urban cool island in the middle of UHI. Therefore, heat mitigation is proven to be one of the environmental services provided by BBG.

scholarly journals Distinct Influences of Urban Villages on Urban Heat Islands: A Case Study in the Pearl River Delta, China

2018 ◽  
Vol 15 (8) ◽  
pp. 1666 ◽  
Author(s):  
Wei Wu ◽  
Hongyan Ren ◽  
Ming Yu ◽  
Zhen Wang
Keyword(s):  
Land Use ◽  
Pearl River Delta ◽  
Object Oriented ◽  
Urban Heat Islands ◽  
Object Oriented Method ◽  
Heat Islands ◽  
Land Use Types ◽  
Core Areas ◽  
Urban Heat ◽  
The Relationship

Widely scattered urban villages (UVs) and increasingly serious urban heat islands (UHIs) are common urban problems in highly urbanized regions, especially in the developing countries. However, the influences of UVs on UHIs remain little understood. In this study, different methodologies are performed to retrieve land surface temperature (LST) from thermal bands and the nearest object-oriented method with spectral, texture, shape metrics using ZY-3 high-resolution satellite imagery, and road network data are used to extract UVs and other land-use types in the Guangzhou–Foshan (GF) core areas of Pearl River Delta (PRD). Moreover, the relationship between LST and land-use types is then analyzed on the multiple scales. The results show that five land-use types (vegetation, normal construction land (NCL), UVs, water, and unused land) extracted by the object-oriented method were qualified for subsequent analysis because of satisfactory overall accuracy (0.887) and the Kappa coefficient (0.863). In the GF core areas presenting the most outstanding UHI effect across the PRD region, about 60.5% of the total area is covered by the impervious surfaces, including NCL (50.4%) and UVs (10.1%). The average LST of UVs was 1.89–2.97 °C lower than that of NCL. According to the average contribution index of thermal effect and the Pearson’s correlation coefficients, UVs present a relatively lower contribution to UHI and a weaker warming effect than NCL, but possess a higher contribution to UHI and a stronger warming effect than other land-use types, resulting in some slightly lower LST-valleys in the UVs adjacent to the NCL and distinct LST-peaks of UVs close to vegetation and water on the surface temperature profile lines. This work increases our understanding of the relationship between increasingly serious UHIs and widely distributed UVs, and would be valuable for local authorities to monitor and improve urban environment in metropolitan regions.

Daytime and nighttime urban heat islands statistical models for Atlanta

2016 ◽  
Vol 44 (2) ◽  
pp. 308-327 ◽  
Author(s):  
Bumseok Chun ◽  
Subhrajit Guhathakurta
Keyword(s):  
Urban Design ◽  
Surface Characteristics ◽  
Urban Heat Islands ◽  
Dominant Factor ◽  
Relative Importance ◽  
Geospatial Information ◽  
Heat Islands ◽  
Urban Heat ◽  
2D And 3D ◽  
The Relationship

In this study, we empirically model the interactions between 2D and 3D geospatial information and both daytime and nighttime urban heat islands, and estimate the relative importance of various urban heat islands drivers. While previous studies have explored the relationship between the urban heat islands and 2D urban features, the interactions with 3D urban features and neighboring surface characteristics have not been adequately explored. This paper specifies the impacts of these urban features on the urban heat islands intensity during daytime and nighttime, which tend to be quite different. The empirical evidence from this study suggests that while vegetation is the dominant factor for urban heat islands intensity during daytime, the urban canyon has stronger impacts on the urban heat islands than vegetation at night. In addition, adjacent surfaces are more likely to influence nighttime surface temperatures. These results could be used to develop urban design solutions for mitigating the urban heat islands.

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