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Geoid Determination Over Basin-Wide Scales Using a Combination of Satellite Tracking, Surface Gravity and Altimeter Observations

  • J. G. Marsh
  • F. J. Lerch
  • S. M. Klosko
  • T. L. Engelis
  • G. B. Patel
  • J. W. Robbins
  • R. G. Williamson
Conference paper
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 104)

Abstract

A spherical harmonic model of the Earth’s gravitational field has been developed using tracking data of 31 satellites, surface gravimetry, and satellite radar altimetry. The model is complete to degree and order 50 and provides a simultaneous recovery for invariant and tidally induced gravitational effects. The ocean tidal model consists of 600 background tidal terms with 90 coefficients being adjusted. The altimeter data are utilized as tracking observations of the ocean surface and provide for a simultaneous recovery of a model describing the stationary sea surface topography complete to degree and order 10 in spherical harmonics. Comparisons between satellite-only models and those obtained with the addition of altimetry/gravimetry find an improvement in geoid representation of more than a factor of two, extending even to the model’s longest wavelengths. The stability of the geoid recovery has been assessed using subset solutions. For wavelengths of 2000 km or longer, the combination model provides geoid definition of 6 cm rms accuracy.

Keywords

Altimeter Data Satellite Tracking Gravitational Model Geoid Determination Ocean Tidal Model 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Lerch, F.J., J.G. Marsh, S.M. Klosko, E.C. Pavlis, G.B. Patel, D.S. Chinn, C.A. Wagner, An Improved Error Assessment for the GEM-T1 Gravitational Model, NASA TM-100713, November 1988.Google Scholar
  2. Lerch, F. J., Optimum Data Weighting and Error Calibration for Estimation of Gravitational Parameters, NASA TM-100737, July, 1989.Google Scholar
  3. Marsh, J.G. et al., A New Gravitational Model for the Earth from Satellite Tracking Data: GEM-T1, J. Geophys. Res., 93, B6, 6169–6215, 1988.CrossRefGoogle Scholar
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  5. Marsh, J.G. et al., The GEM-T2 Gravitational Model, NASA TM-100746, September, 1989b.Google Scholar
  6. Pavlis, N.K., Modeling and Estimation of Low Degree Geopotential Model from Terrestrial Gravity Data, The Ohio State University Department of Geodetic Science and Surveying, Report No. 386, Columbus, 1988.Google Scholar
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Copyright information

© Springer-Verlag New York Inc. 1990

Authors and Affiliations

  • J. G. Marsh
    • 1
  • F. J. Lerch
    • 1
  • S. M. Klosko
    • 2
  • T. L. Engelis
    • 2
  • G. B. Patel
    • 2
  • J. W. Robbins
    • 2
  • R. G. Williamson
    • 2
  1. 1.NASA/Goddard Space Flight CenterUSA
  2. 2.ST Systems Inc.USA

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