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http://dx.doi.org/10.7780/kjrs.2021.37.5.2.10

A Study on the Possibility of Short-term Monitoring of Coastal Topography Changes Using GOCI-II  

Lee, Jingyo (Korea Ocean Satellite Center, KIOST)
Kim, Keunyong (Korea Ocean Satellite Center, KIOST)
Ryu, Joo-Hyung (Korea Ocean Satellite Center, KIOST)
Publication Information
Korean Journal of Remote Sensing / v.37, no.5_2, 2021 , pp. 1329-1340 More about this Journal
Abstract
The intertidal zone, which is a transitional zone between the ocean and the land, requires continuous monitoring as various changes occur rapidly due to artificial activity and natural disturbance. Monitoring of coastal topography changes using remote sensing method is evaluated to be effective in overcoming the limitations of intertidal zone accessibility and observing long-term topographic changes in intertidal zone. Most of the existing coastal topographic monitoring studies using remote sensing were conducted through high spatial resolution images such as Landsat and Sentinel. This study extracted the waterline using the NDWI from the GOCI-II (Geostationary Ocean Color Satellite-II) data, identified the changes in the intertidal area in Gyeonggi Bay according to various tidal heights, and examined the utility of DEM generation and topography altitude change observation over a short period of time. GOCI-II (249 scenes), Sentinel-2A/B (39 scenes), Landsat 8 OLI (7 scenes) images were obtained around Gyeonggi Bay from October 8, 2020 to August 16, 2021. If generating intertidal area DEM, Sentinel and Landsat images required at least 3 months to 1 year of data collection, but the GOCI-II satellite was able to generate intertidal area DEM in Gyeonggi Bay using only one day of data according to tidal heights, and the topography altitude was also observed through exposure frequency. When observing coastal topography changes using the GOCI-II satellite, it would be a good idea to detect topography changes early through a short cycle and to accurately interpolate and utilize insufficient spatial resolutions using multi-remote sensing data of high resolution. Based on the above results, it is expected that it will be possible to quickly provide information necessary for the latest topographic map and coastal management of the Korean Peninsula by expanding the research area and developing technologies that can be automatically analyzed and detected.
Keywords
Coastal topography; DEM; GOCI-II; Gyeonggi Bay; Intertidal zone; Tidal flat;
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