Monitoring of coastline change using Sentinel-2 MSI data. A case study in Thanh Hoa Province, Vietnam
DOI:
https://doi.org/10.12775/bgeo-2024-0006Keywords
coastline change, remote sensing, water index, Sentinel-2 MSI, Thanh Hoa Province, VietnamAbstract
Vietnam is a coastal country with a coastline of more than 3,260 km, stretching from north to south. Coastal change in Vietnam is complicated further by the effects of climate change, including erosion and accretion, causing great impacts on infrastructure and the environment. This article presents the results of assessing coastline changes in Thanh Hoa Province (North Central region of Vietnam) from Sentinel-2 MSI satellite image data for the period 2015–23. Three Sentinel-2 MSI images taken in December 2015, December 2020 and December 2023 were used to calculate the water indices, including Normalised Difference Water Index (NDWI), Modified Normalised Difference Water Index (MNDWI) Argumented Normalised Difference Water Index (ANDWI) and Automated Water Extraction Index (AWEIsh), then extract the shoreline using the thresholding method and select the water index with the highest accuracy through comparing the overall accuracy and Kappa coefficient. The coastlines of 2015, 2020 and 2023 years are overlaid to evaluate the coastal changes in the study area. The results received in the study provide objective and timely information, helping managers effectively monitor and respond to coastline changes.
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Copyright (c) 2024 Le Hung Trinh, Thi Giang Le, Xuan Bien Tran, Quoc Vinh Tran, Van Phu Le, Thi Phuong To
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