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Title: Investigating the performance of sentinel-2A and Landsat 8 imagery in mapping shoreline changes
Authors: Mitri, George 
Nader, Manal 
Abou Dagher, Manale 
Gebrael, Karen 
Affiliations: Institute of Environment 
Institute of Environment 
Institute of Environment 
Institute of Environment 
Keywords: Shoreline changes
Landsat-8 panchromatic
Geographic object-based image analysis
Subjects: Aerial photography
Issue Date: 2020
Part of: Journal of coastal conservation
Volume: 24
Issue: 40
Start page: 1
End page: 9
Regular detection and timely monitoring of shoreline evolution are essentially needed in order to identify areas that require further investigation and protection. Possibilities for regular monitoring of shoreline changes are better facilitated now with high-frequency revisit times of Landsat-Sentinel-2 virtual constellation. Accordingly, this study aimed at investigating the performance of Landsat 8 and Sentinel-2A satellite imagery in mapping shoreline changes. The specific objectives were to 1) create reference data of shoreline erosion, accretion and seafilling using very high spatial resolution data, 2) compare the results of shoreline changes by using Landsat 8 and Sentinel-2A imagery respectively, and 3) complete the inventory of shoreline changes between 1962 and 2016. A Quickbird panchromatic imagery (0.6 m) of 2010 was employed in combination with aerial photography (0.5 m) from 1962 for the generation of reference data using a traditional photo-interpretation method. Then, geographic object-based image analysis (GEOBIA) was employed to map changes in the shoreline between 1962 (i.e., reference shoreline) and 2016 using Sentinel-2A (10 m) and Landsat 8 panchromatic band (15 m) imagery, consecutively. The use of Sentinel-2A image provided slightly better accuracy results when compared with those from the Landsat 8 image. Accordingly, an inventory of Lebanese shoreline evolution between 1962 and 2016 was completed using the Sentinel-2A classification results. The combined use of Landsat-Sentinel-2 imagery is expected to generate reliable data records for continuous monitoring of shoreline changes.
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Institute of the Environment

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