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Distinct Influences of Urban Villages on Urban Heat Islands: A Case Study in the Pearl River Delta, China
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 performe...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6121422/ https://www.ncbi.nlm.nih.gov/pubmed/30082641 http://dx.doi.org/10.3390/ijerph15081666 |
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author | Wu, Wei Ren, Hongyan Yu, Ming Wang, Zhen |
author_facet | Wu, Wei Ren, Hongyan Yu, Ming Wang, Zhen |
author_sort | Wu, Wei |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-6121422 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-61214222018-09-07 Distinct Influences of Urban Villages on Urban Heat Islands: A Case Study in the Pearl River Delta, China Wu, Wei Ren, Hongyan Yu, Ming Wang, Zhen Int J Environ Res Public Health Article 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. MDPI 2018-08-06 2018-08 /pmc/articles/PMC6121422/ /pubmed/30082641 http://dx.doi.org/10.3390/ijerph15081666 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Wu, Wei Ren, Hongyan Yu, Ming Wang, Zhen Distinct Influences of Urban Villages on Urban Heat Islands: A Case Study in the Pearl River Delta, China |
title | Distinct Influences of Urban Villages on Urban Heat Islands: A Case Study in the Pearl River Delta, China |
title_full | Distinct Influences of Urban Villages on Urban Heat Islands: A Case Study in the Pearl River Delta, China |
title_fullStr | Distinct Influences of Urban Villages on Urban Heat Islands: A Case Study in the Pearl River Delta, China |
title_full_unstemmed | Distinct Influences of Urban Villages on Urban Heat Islands: A Case Study in the Pearl River Delta, China |
title_short | Distinct Influences of Urban Villages on Urban Heat Islands: A Case Study in the Pearl River Delta, China |
title_sort | distinct influences of urban villages on urban heat islands: a case study in the pearl river delta, china |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6121422/ https://www.ncbi.nlm.nih.gov/pubmed/30082641 http://dx.doi.org/10.3390/ijerph15081666 |
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