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Estimation of Urban Green Cover Changes in Colombo Municipal Area over Ten Years Using Remote Sensing Techniques

Chinese Journal of Urban and Environmental Studies 2022年第4期10卷 95-108页

作者： karunarathna atapattu mudiyanselage ruwanmali priyanwada atapattu E.A.Nadeeka M.EDIRISINGHE Sarath P.NISSANKA T.Tamasha FERNANDO Ajith Rohana GUNAWARDENA Postgraduate Institute of Agriculture Old Galaha Road University of Peradeniya Department of Crop Science Faculty of Agriculture University of Peradeniya Research and Development Central Environmental Authority

Colombo is the commercial capital of Sri Lanka, with a high population, buildings, and ***, it is vital to observe the spatial distribution of vegetation types and changes in the green cover of Colombo city to identify priority areas to improve green cover. This study was carried out to estimate the changes in green cover in Colombo Municipal Area(CMA) and its postal zones over 10 years using remote sensing techniques. The green cover was categorized into trees, shrubs, Play-grounds(PG)/Grasslands, wetlands, rooftops, and Ipomoea cover. Accordingly, total green cover increased up to 26.17% from 22.36% during the period of 2012–2022. During the past decade,except for the PG/Grasslands, all other vegetation types have been reduced. Five of the 15 postal zones in the CMA’s green cover have decreased during the past 10 years, including Colombo 04, 05,06, 09, and 13. The highest green cover was recorded in Colombo 07, while the lowest green cover was present in Colombo 11. The outcome of the study emphasizes that CMA is moving towards greening and sustainability even with the expansion of built-up areas and urban populations.

关键词： Urban areas Colombo Municipal Area postal zone green cover remote sensing

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