Next Article in Journal
A Bibliometric Analysis on Land Degradation: Current Status, Development, and Future Directions
Previous Article in Journal
Acknowledgement to Reviewers of Land in 2019
Previous Article in Special Issue
Effect of Land Acquisition and Compensation on the Livelihoods of People in Quang Ninh District, Quang Binh Province: Labor and Income
Open AccessArticle

Mapping Land Cover Change over a 25-Year Period (1993–2018) in Sri Lanka Using Landsat Time-Series

1
School of Science, RMIT University, Melbourne, VIC 3000, Australia
2
Department of Export Agriculture, Faculty of Animal Science and Export Agriculture, Uva Wellassa University, Passara Road, Badulla 90000, Sri Lanka
*
Author to whom correspondence should be addressed.
Received: 28 October 2019 / Revised: 9 December 2019 / Accepted: 16 December 2019 / Published: 16 January 2020
(This article belongs to the Special Issue Land Cover/Land-Use Changes in South and Southeast Asia)
Land use and land cover change (LULCC) are dynamic over time and space due to human and biophysical factors. Accurate and up-to-date LULCC information is a mandatory part of environmental change analysis and natural resource management. In Sri Lanka, there is a significant temporal gap in the existing LULCC information due to the civil war that took place from 1983 to 2009. In order to fill this gap, this study presents a whole-country LULCC map for Sri Lanka over a 25-year period using Landsat time-series imagery from 1993 to 2018. The LandTrendr change detection algorithm, utilising the normalised burn ratio (NBR) and normalised difference vegetation index (NDVI), was used to develop spectral trajectories over this time period. A land cover change and disturbance map was created with random forest, using 2117 manually interpreted reference pixels, of which 75% were used for training and 25% for validation. The model achieved an overall accuracy of 94.14%. The study found that 890,003.52 hectares (ha) (13.5%) of the land has changed, while 72,266.31 ha (1%) was disturbed (but not permanently changed) over the last 25 years. LULCC was found to concentrate on two distinct periods (2000 to 2004 and 2010 to 2018) when social and economic stability allowed greater land clearing and investment opportunities. In addition, LULCC was found to impact forest reserves and protected areas. This new set of Sri Lanka-wide land cover information describing change and disturbance may provide a reference point for policy makers and other stakeholders to aid in decision making and for planning purposes. View Full-Text
Keywords: land use and land cover change; time-series; Landsat; South Asia; Sri Lanka; tropical land use and land cover change; time-series; Landsat; South Asia; Sri Lanka; tropical
Show Figures

Figure 1

MDPI and ACS Style

Rathnayake, C.W.; Jones, S.; Soto-Berelov, M. Mapping Land Cover Change over a 25-Year Period (1993–2018) in Sri Lanka Using Landsat Time-Series. Land 2020, 9, 27.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop