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Geoid undulation differences between geopotential models

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Abstract

Three geopotential models (OSU91A, GEM-T3, and GRIM4-C2), available in 1991, have been compared in several ways. The models have been differenced to find the geoid undulation difference are on the order of 1 m in land areas and 30 cm in ocean areas with extreme differences reaching 6 m. The models were also evaluated, augmented by higher degree terms, when necessary, through comparisons with undulations at Doppler and GPS positioned stations. The undulation difference at the Doppler stations was ± 1.57 m with no significant difference between models. Using 4 GPS test areas, differences were seen between the various models. A final comparison was made between geoid undulations implied by a Geosat 17 day cycle and undulations from the three models. The OSU91A model performed best having a difference standard deviation of ±34 cm.

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References

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  3. Rapp, R. H., Wang, Y. M., Pavlis, N. K.: 1991a, ‘Geoid Undulation Differences Between Geopotential Models’, presentation at the meeting of the European Geophysical Society, Wiesbaden, Germany, April.

  4. Rapp, R. H., Wang, Y. M., Pavlis, N. K.: 1991b, ‘The Ohio State 1991 Geopotential and Sea Surface Topography Harmonic Coefficient Models’, Report 410, Dept. of Geodetic Science and Surveying, The Ohio State University, Columbus, 1991.

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Rapp, R.H., Wang, Y.M. Geoid undulation differences between geopotential models. Surv Geophys 14, 373–380 (1993). https://doi.org/10.1007/BF00690565

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Keywords

  • Standard Deviation
  • Land Area
  • Position Station
  • Test Area
  • Ocean Area