Paper Info
Title
Urbanization and Its Impacts on Land Surface Temperature in Colombo Metropolitan Area, Sri Lanka, from 1988 to 2016.
Abstract
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 degrees C for water surfaces; 5.92 degrees C for vegetation; 8.62 degrees C for bare land; and 8.94 degrees 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.
Year
DOI
Venue
2019
10.3390/rs11080957
REMOTE SENSING
Keywords
Field
DocType
land use,cover change,land surface temperature,impervious surface,multi buffer ring method,gravity model
Water resource management,Land surface temperature,Urbanization,Remote sensing,Geology,Metropolitan area
Journal
Volume
Issue
Citations 
11
8
0
PageRank 
References 
Authors
0.34
0
6
Name
Order
Citations
PageRank
H. P. U. Fonseka100.34
Hongsheng Zhang26912.62
Ying Sun329140.03
Hua Su402.03
Hui Lin545964.06
Yinyi Lin601.01