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World Geodetic Datum 2000

  • E. W. Grafarend
  • A. A. Ardalan
Conference paper
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 120)

Abstract

Based on the current best estimates of the fundamental geodetic parameters, i.e., W 0 (Grafarend and Ardalan, Journal of Geodesy 71 (1997) 673-679), GM (Ries et al, Geophys. Res. Letters 19 (1992) 529-531), J 2 (Lemoine et al, GRAGEO-MAR 1996, International Association of Geodesy, Symposia 117, (1996) 461-469) and Ω (given in Internal Communications of IAG/IUGG Special Commission 3, Darmstadt (1997)), the form parameters of a Somigliana-Pizetti level ellipsoid, namely the semi-major axis a and semi-minor axis b (or equivalents the linear eccentricity ɛ = √a 2 - b 2 ) are computed. There are six parameters namely the four fundamental geodetic parameters {W 0 , GM, J 2 , Ω} and the two form parameters {a, b} or {a, ɛ}, which determine the ellipsoidal reference gravity field of Somigliana-Pizetti type constraint to two nonlinear condition equations. Their iterative solution leads to best estimates a = (6378136.572 ±0.053)m, b = (6356751.920 ±0.052)m, ɛ= (521853.580 ±0.013)m for the tide-free geoid of reference and a = (6378136.602 ±0.053)m, b = (6356751.860 ± 0.052)m, ɛ= (521854.674 ±0.015)m for the zero-frequency tide geoid of reference. The best estimates of the form parameters of a Somigliana-Pizetti level ellipsoid, {a, b}, differ significantly by -0.398m, -0.454m, respectively, from the data of the Geodetic Reference System 1980.

Keywords

Form Parameter Geodetic Reference System Error Propagation Relation Level Ellipsoid Stud Geoph Geod 
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

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Copyright information

© Springer-Verlag Berlin · Heidelberg 2000

Authors and Affiliations

  • E. W. Grafarend
    • 1
  • A. A. Ardalan
    • 1
  1. 1.Department of Geodesy and GeoinformaticsStuttgart UniversityStuttgartGermany

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