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W 0 Estimates in the Frame of the GGOS Working Group on Vertical Datum Standardisation

  • Conference paper
Gravity, Geoid and Height Systems

Part of the book series: International Association of Geodesy Symposia ((IAG SYMPOSIA,volume 141))

Abstract

During the 2011 IUGG General Assembly, GGOS, the IAG Commissions 1 (Reference Frames) and 2 (Gravity Field) and the IGFS established a joint working group devoted to the Vertical Datum Standardisation. This working group supports the activities of GGOS Theme 1 Unified Height System; in particular, to recommend a reliable geopotential value W 0 to be introduced as the conventional reference level for the realisation of the GGOS Vertical Reference System. At present, the most commonly accepted W 0 value corresponds to the best estimate available in 2004; however, this value presents discrepancies of about 2 m2 s−2 with respect to recent computations based on the latest Earth’s surface and gravity field models. According to this, as a first approach, four different teams working on the computation of a global W 0 value were brought together in order to compare methodologies and models, and to establish the reliability of the individual computations. Results of this comparison show that the four individual estimates present a maximum discrepancy of about 0.5 m2 s−2. They also confirm that the W 0 value declared as the best estimate in 2004 corresponds to an equipotential surface located about 17 cm beneath the sea surface scanned by satellite altimetry, while the potential value U 0 of the GRS80 ellipsoid realises an equipotential surface located about 67 cm lower. In this context, the need to provide a new better estimate of W 0 is evident.

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Acknowledgments

The authors would like to thank the reviewers whose comments helped to improve the paper. The Prague Group specially recognizes the support of the grant N62909-12-1-7037, ACO: N62927 ONRG LTR 7037. The work of the Bratislava Group has been supported by the grants APVV-0072-11 and VEGA 1/1063/11.

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Authors and Affiliations

  1. Deutsches Geodätisches Forschungsinstitut (DGFI), Alfons-Goppel-Str. 11, 80539, Munich, Germany

    L. Sánchez

  2. Faculty of Civil Engineering, Department of Topography, Tishreen University, 2230, Latakia, Syria

    N. Dayoub

  3. Faculty of Civil Engineering, Department of Mathematics and Descriptive Geometry, Slovak University of Technology in Bratislava, Bratislava, Slovakia

    R. Čunderlík, Z. Minarechová & K. Mikula

  4. Geographic Service of the Czech Armed Forces, Military Geographic and Hydrometeorologic Office, Dobruška, Czech Republic

    V. Vatrt & M. Vojtíšková

  5. Astronomical Institute, Academy of Sciences, Prague, Czech Republic

    Z. Šíma

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Correspondence to L. Sánchez .

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  1. Geodesy Department, Federal Office of Topography swisstopo, Wabern, Switzerland

    Urs Marti

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Sánchez, L. et al. (2014). W 0 Estimates in the Frame of the GGOS Working Group on Vertical Datum Standardisation. In: Marti, U. (eds) Gravity, Geoid and Height Systems. International Association of Geodesy Symposia, vol 141. Springer, Cham. https://doi.org/10.1007/978-3-319-10837-7_26

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