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Article: Urbanization and its impacts on land surface temperature in Colombo Metropolitan Area, Sri Lanka, from 1988 to 2016
Title | Urbanization and its impacts on land surface temperature in Colombo Metropolitan Area, Sri Lanka, from 1988 to 2016 |
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Authors | |
Keywords | Gravity model Impervious surface Land surface temperature Land use/cover change Multi buffer ring method |
Issue Date | 2019 |
Citation | Remote Sensing, 2019, v. 11, n. 8, article no. 957 How to Cite? |
Abstract | © 2019 by the authors. Urbanization has become one of the most important human activities modifying the Earth's land surfaces; and its impacts on tropical and subtropical cities (e.g., in South/Southeast Asia) are not fully understood. Colombo; the capital of Sri Lanka; has been urbanized for about 2000 years; due to its strategic position on the east-west sea trade routes. This study aims to investigate the characteristics of urban expansion and its impacts on land surface temperature in Colombo from 1988 to 2016; using a time-series of Landsat images. Urban land cover changes (ULCC) were derived from time-series satellite images with the assistance of machine learning methods. Urban density was selected as a measure of urbanization; derived from both the multi-buffer ring method and a gravity model; which were comparatively adopted to evaluate the impacts of ULCC on the changes in land surface temperature (LST) over the study period. The experimental results indicate that: (1) the urban land cover classification during the study period was conducted with satisfactory accuracy; with more than 80% for the overall accuracy and over 0.73 for the Kappa coefficient; (2) the Colombo Metropolitan Area exhibits a diffusion pattern of urban growth; especially along the west coastal line; from both the multi-buffer ring approach and the gravity model; (3) urban density was identified as having a positive relationship with LST through time; (4) there was a noticeable increase in the mean LST; of 5.24 °C for water surfaces; 5.92 °C for vegetation; 8.62 °C for bare land; and 8.94 °C for urban areas. The results provide a scientific reference for policy makers and urban planners working towards a healthy and sustainable Colombo Metropolitan Area. |
Persistent Identifier | http://hdl.handle.net/10722/277706 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Fonseka, H. P.U. | - |
dc.contributor.author | Zhang, Hongsheng | - |
dc.contributor.author | Sun, Ying | - |
dc.contributor.author | Su, Hua | - |
dc.contributor.author | Lin, Hui | - |
dc.contributor.author | Lin, Yinyi | - |
dc.date.accessioned | 2019-09-27T08:29:45Z | - |
dc.date.available | 2019-09-27T08:29:45Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Remote Sensing, 2019, v. 11, n. 8, article no. 957 | - |
dc.identifier.uri | http://hdl.handle.net/10722/277706 | - |
dc.description.abstract | © 2019 by the authors. Urbanization has become one of the most important human activities modifying the Earth's land surfaces; and its impacts on tropical and subtropical cities (e.g., in South/Southeast Asia) are not fully understood. Colombo; the capital of Sri Lanka; has been urbanized for about 2000 years; due to its strategic position on the east-west sea trade routes. This study aims to investigate the characteristics of urban expansion and its impacts on land surface temperature in Colombo from 1988 to 2016; using a time-series of Landsat images. Urban land cover changes (ULCC) were derived from time-series satellite images with the assistance of machine learning methods. Urban density was selected as a measure of urbanization; derived from both the multi-buffer ring method and a gravity model; which were comparatively adopted to evaluate the impacts of ULCC on the changes in land surface temperature (LST) over the study period. The experimental results indicate that: (1) the urban land cover classification during the study period was conducted with satisfactory accuracy; with more than 80% for the overall accuracy and over 0.73 for the Kappa coefficient; (2) the Colombo Metropolitan Area exhibits a diffusion pattern of urban growth; especially along the west coastal line; from both the multi-buffer ring approach and the gravity model; (3) urban density was identified as having a positive relationship with LST through time; (4) there was a noticeable increase in the mean LST; of 5.24 °C for water surfaces; 5.92 °C for vegetation; 8.62 °C for bare land; and 8.94 °C for urban areas. The results provide a scientific reference for policy makers and urban planners working towards a healthy and sustainable Colombo Metropolitan Area. | - |
dc.language | eng | - |
dc.relation.ispartof | Remote Sensing | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.subject | Gravity model | - |
dc.subject | Impervious surface | - |
dc.subject | Land surface temperature | - |
dc.subject | Land use/cover change | - |
dc.subject | Multi buffer ring method | - |
dc.title | Urbanization and its impacts on land surface temperature in Colombo Metropolitan Area, Sri Lanka, from 1988 to 2016 | - |
dc.type | Article | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.3390/rs11080957 | - |
dc.identifier.scopus | eid_2-s2.0-85065036707 | - |
dc.identifier.volume | 11 | - |
dc.identifier.issue | 8 | - |
dc.identifier.spage | article no. 957 | - |
dc.identifier.epage | article no. 957 | - |
dc.identifier.eissn | 2072-4292 | - |
dc.identifier.isi | WOS:000467646800067 | - |
dc.identifier.issnl | 2072-4292 | - |