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http://dx.doi.org/10.7319/kogsis.2016.24.1.109

Height Datum Transformation using Precise Geoid and Tidal Model in the area of Anmyeon Island  

Roh, Jae Young (Department of Hydrography, Pukyong National University)
Lee, Dong Ha (Department of Civil Engineering, Kangwon National University)
Suh, Yong Cheol (Department of Civil Engineering, Pukyong National University)
Publication Information
Journal of Korean Society for Geospatial Information Science / v.24, no.1, 2016 , pp. 109-119 More about this Journal
Abstract
The height datum of Korea is currently separated into land and sea, which makes it difficult to acquire homogeneous and accurate height information throughout the whole nation. In this study, we therefore tried to suggest the more effective way to transform the height information were constructed separately according to each height datum on land and sea to those on the unique height datum using precise geoid models and tidal observations in Korea. For this, Anmyeon island was selected as a study area to develop the precise geoid models based on the height datums land (IMSL) and sea (LMSL), respectively. In order to develop two hybrid geoid models based on each height datum of land an sea, we firstly develop a precise gravimetric geoid model using the remove and restore (R-R) technique with all available gravity observations. The gravimetric geoid model were then fitted to the geometric geoidal heights, each of which is represented as height datum of land or sea respectively, obtained from GPS/Leveling results on 15 TBMs in the study area. Finally, we determined the differences between the two hybrid geoid models to apply the height transformation between IMSL and LMSL. The co-tidal chart model of TideBed system developed by Korea Hydrographic and Oceanographic Agency (KHOA) which was re-gridded to have the same grid size and coverage as the geoid model, in order that this can be used for the height datum transformation from LMSL to local AHHW and/or from LMSL to local DL. The accuracy of height datum transformation based on the strategy suggested in this study was approximately ${\pm}3cm$. It is expected that the results of this study can help minimize not only the confusions on the use of geo-spatial information due to the disagreement caused by different height datum, land and sea, in Korea, but also the economic and time losses in the execution of coastal development and disaster prevention projects in the future.
Keywords
Height Datum; Height Datum Transformation Model; Geoid Model; TideBed System; Anmyeon Island;
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Times Cited By KSCI : 6  (Citation Analysis)
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