Gravity field and geoid for Japan
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The latest gravimetric geoid of Japan, JGEOID98 was evaluated, focussed on the longwavelength distortion: The network adjustment applied to the ship gravity data was considered to yield the distortion in the gravity field.
A recent global marine gravity model from altimetry data, KMS98 was assessed over Japan, demonstrating significant improvement in long wavelength. A preliminary test to use KMS98 for correcting JGEOID98 was made with a simple filtering approach and the results show substantial improvement in fixing the long-wavelength errors. The distortion in JGEOID98 was estimated to be on the order of! 10 mgal.
KMS98 worsened the geoid in short wavelength, having some problematic areas near the coasts. We need to develop an optimal way to incorporate altimeter data in the geoid determination over Japan.
KeywordsGravimetric geoid gravity field
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- Andersen, OB, P Knudsen (1998) Global Marine Gravity Field from the ERS-1 and Geosat Geodetic Mission Altimetry. J Geophys Res 103(C4): 8129–8137Google Scholar
- Andersen, OB, P Knudsen, S Kenyon, R Trimmer (1998) The KMS98 Global Marine Gravity Field. Abstracts 2nd Joint Meeting of the International Gravity Commission and the International Geoid Commission, Trieste, Italy, September 7–12, 1998: 46Google Scholar
- Haagmans, R, E de Min, M van Gelderen (1993) Fast Evaluation of Convolution Integrals on the Sphere Using 1D-FFT and a Comparison with Existing Methods for Stokes’ Integral. Maniscr Geod, 18(5): 227–241Google Scholar
- Kuroishi, Y (1995) Precise Gravimetric Determination of Geoid in the Vicinity of Japan. Bull Geographical Survey Inst 41: 1–93Google Scholar
- Kuroishi, Y (1998) Determination of Gravimetric Geoid of Japan and Its Improvement. Proc Symp Ocean-Earth Dynamics and Satellite Altimetry, Ocean Res Inst, Univ Tokyo, November 11-12, 1997: 119–128Google Scholar
- Kuroishi, Y (1999a) Improvement of Japanese Geoid with 1D-FFT Method and its Comparison with Altimetry derived Geoid. In: Proc. of 2nd Joint Meeting of the International Gravity Commission and the International Geoid Commission, Trieste, Italy, September 7–12 1998 in press.Google Scholar
- Kuroislu, Y (1999b) Impproved Gravimetric Geoid for Japan, J GEOm98. Paper submitted to J Geodesy.Lemoine, FG, DE Smith, L Kunz, R Smith, EC Pavlis, NK Pavlis, SM Klosko, DS Chinn, MH Torrence, RG Williamson, CM Cox, KE RacWin, YM Wang, SC Kenyon, RGoogle Scholar
- Salman, R Trimmer, RH Rapp, R$ Nerem (1997) In Segawa J et al.(eds.): Proc. of the IAG Symp. No 117 Geoid and Marine Geodesy. Tokyo, Japan, September 30- Oct. 5, 1996, Springer Verlag, 461–469Google Scholar
- Smith, DA, DG Milbert (1997) Evaluation of Preliminary Models of the Geopotenfial in the United States. International Geoid Service Bull 6, DIIAR- Politecnico di Milano, Milano, Italy: 7–32Google Scholar
- Strang van Hees, G (1990) Stokes Formula Using Fast Fourier Techniques. Manuscr Geod 15: 235–239Google Scholar
- Wichiencharoen C (1982) The Indirect Effects on the Computation of Geoid Undulations. Rep 336, Dep Geod Sci Surv, the Ohio State University, ColumbusGoogle Scholar