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http://dx.doi.org/10.11108/kagis.2021.24.2.052

Detection of the Coastal Wetlands Using the Sentinel-2 Satellite Image and the SRTM DEM Acquired in Gomsoman Bay, West Coasts of South Korea  

CHOUNG, Yun-Jae (Geospatial Research Center, GEO C&I Co., Ltd.)
KIM, Kyoung-Seop (Geospatial Research Center, GEO C&I Co., Ltd.)
PARK, Insun (Geospatial Research Center, GEO C&I Co., Ltd.)
Publication Information
Journal of the Korean Association of Geographic Information Studies / v.24, no.2, 2021 , pp. 52-63 More about this Journal
Abstract
In previous research, the coastal wetlands were detected by using the vegetation indices or land cover classification maps derived from the multispectral bands of the satellite or aerial imagery, and this approach caused the various limitations for detecting the coastal wetlands with high accuracy due to the difficulty of acquiring both land cover and topographic information by using the single remote sensing data. This research suggested the efficient methodology for detecting the coastal wetlands using the sentinel-2 satellite image and SRTM(Shuttle Radar Topography Mission) DEM (Digital Elevation Model) acquired in Gomsoman Bay, west coasts of South Korea through the following steps. First, the NDWI(Normalized Difference Water Index) image was generated using the green and near-infrared bands of the given Sentinel-2 satellite image. Then, the binary image that separating lands and waters was generated from the NDWI image based on the pixel intensity value 0.2 as the threshold and the other binary image that separating the upper sea level areas and the under sea level areas was generated from the SRTM DEM based on the pixel intensity value 0 as the threshold. Finally, the coastal wetland map was generated by overlaying analysis of these binary images. The generated coastal wetland map had the 94% overall accuracy. In addition, the other types of wetlands such as inland wetlands or mountain wetlands were not detected in the generated coastal wetland map, which means that the generated coastal wetland map can be used for the coastal wetland management tasks.
Keywords
Coastal Wetland; Sentinel-2 Satellite Image; Normalized Difference Water Index; Digital Elevation Model;
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