Remote Sensing - Derived Oceanic Bathymetry in The Gulf of Thailand Using Landsat 8 Imageries
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Abstract
The objective of this research is to apply Landsat 8 satellite imagery for analyzing the depth in the Gulf of Thailand in three study areas boundaries based on nautical charts. The first study area is the inner Gulf of Thailand (Entrance to Mae Nam Chao Phraya), the second study area is Eastern Gulf of Thailand (Koh Saba to Koh Chik Nok), and the third study area is Western Gulf of Thailand (Ao Chumphon). The depth accuracy from the integration of nautical chart techniques, Satellite Derived Bathymetry (SDB) and Log-Band Ratio Method is higher than single-beam echo sounding. About the depth between 0-15 meters in the study areas, the results indicate the Coefficient of determination (R2) in the Inner Gulf of Thailand, Eastern Gulf of Thailand, and Western Gulf of Thailand as 0.8621, 0.9130 and 0.9304 respectively. Depth from the SDB charts precisely consistent with depth from nautical chart can be concluded that depth derived from the SDB is suitable especially the area in the western Gulf of Thailand. The result of the study confirms that the SDB method and Log-Band Ratio Method can be alternative methods to support hydrographic bathymetry surveys in areas where depth is less than 15 meters or where, hydrographic bathymetry data is unavailable.
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