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Abstract

Coastline is the actual line where the land meets the water and it represents an important feature in the water land intersection environment. Coastline extraction plays a significant role in monitoring the land changes that result from the continuous natural dynamic processes in general and the strong wave action in particular. This paper uses the image band combination technique for coastline extraction using satellite images. The study area of the investigation comprises two islands located at the Red Sea coastal tract (Marzuq Islands). The accuracy of the extracted coastline has been estimated as 0.9 pixels (pixel size = 10 m). The investigation demonstrated that the area of the large island has been increased approximately by +0.18% from December 2015 to December 2019 and decreased by -0.35% from December 2019 to June 2024. The area of the small island has been decreased approximately by -0.19% from December 2015 to December 2019 and increased by +1.39% from December 2019 to June 2024. Generally, the changes in the island's areas demonstrated a gain/loss (increase/decrease) pattern in the island's areas. The total gain/loss is -0.17% for the large island and +1.20% for the small island area in the period December 2015 to June 2024. The results revealed that open-source European Sentinel-2A optical imaging satellite data can be used to monitor changes in the national islands, which represent a significant national resource. However, any effort in this direction would be an excellent contribution towards achieving Vision 2030.

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Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

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