Comparison of Latest Global and Regional Gravimetric Geoid Models with GPS/Leveling Geoidal Undulations Over Japan
The success of the dedicated gravity satellite missions CHAMP and GRACE has enabled global geoid determination at unprecedented accuracy and has stimulated study on geoid modeling at a very high-resolution on a global scale as well as for local improvement. The paper first describes the latest determination of a gravimetric geoid model for Japan, obtained by combining a GRACE-derived global geopotential model, altimetry-derived ocean gravity model and local surface gravity measurements on land and at sea. Then, a comparison of the model is made with EGM2008 and GPS/leveling geoidal undulations over four main islands of Japan. Third, we determine sea surface dynamic heights around Japan from a combination of a regional geoid model, tidal records and GPS/leveling data at the coast and on isolated islands and compare them with an oceanographic model.
KeywordsGravimetric geoid GPS/leveling geoidal undulations GRACE Comparison
The global high-resolution geopotential model, EGM2008, and its handling software are made available by the U.S. National Geospatial-Intelligence Agency. The Regional Delayed Mode Data Base used is provided by the Japan Oceanographic Data Center. The figures are created by GMT (Wessel and Smith 1998). The author’s thanks are extended to the institutes and the researchers. The author is also grateful to two anonymous reviewers for their helpful comments and suggestions.
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