Choung, Y.-J., 2023. Mapping coastlines in an estuary of the West Nakdong River using SAR satellite imagery. In: Lee, J.L.; Lee, H.; Min, B.I.; Chang, J.-I.; Cho, G.T.; Yoon, J.-S., and Lee, J. (eds.), Multidisciplinary Approaches to Coastal and Marine Management. Journal of Coastal Research, Special Issue No. 116, pp. 200-204. Charlotte (North Carolina), ISSN 0749-0208.

A coastline is significant for describing the coastal shapes and preserving the coastal properties. Remote sensing datasets acquired by the satellite sensors are useful for mapping coastlines in the wide coastal zones without human access. In this research, the Sentinel-1 satellite image, a widely used SAR satellite imagery, was used for mapping the coastlines in an estuary of the West Nakdong River, as follows. First, the given Sentinel-1 satellite image was radiometrically calibrated to get the sigma nought image. Next, the speckle filter was employed to remove some radar backscatter noises in the sigma nought data. Then, the refined image was terrain corrected using the reference digital elevation model, and the binarized image was generated from the terrain corrected image to classify the water and non-water features. Finally, the boundary lines in the binarized image were selected as the coastlines. The statistical results showed that the accuracy of the generated coastlines was less than 10 m. In future research, the optical satellite imagery and the SAR satellite imagery would be compared for mapping the accurate coastlines in the various type of coasts.