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    Progress Towards Implementation and Development of a New Zealand National Vertical Datum

    Access Status
    Fulltext not available
    Authors
    Amos, Matthew
    Featherstone, Will
    Blick, G.
    Date
    2005
    Type
    Conference Paper
    
    Metadata
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    Citation
    Amos, M and Featherstone, Will and Blick, G. 2005. Progress Towards Implementation and Development of a New Zealand National Vertical Datum, in Fernando Sanso (ed), IAG General Assembly, Jun 30 2003, pp. 338-343. Sapporo, Japan: Springer.
    Source Title
    A Window on the Future of Geodesy: Proceedings of the International Association of Geodesy
    Source Conference
    IAG General Assembly
    ISBN
    3-540-24055-1
    Faculty
    Department of Spatial Sciences
    Faculty of Science and Engineering
    WA School of Mines
    Remarks

    The original publication is available at : http://www.springerlink.com

    URI
    http://hdl.handle.net/20.500.11937/40224
    Collection
    • Curtin Research Publications
    Abstract

    New Zealand currently uses 13 disparate vertical datums, each connected to a separate tide gauge. In 1998, a new national datum, NZGD2000, was implemented based on GPS observations. This leads to a 3D geocentric datum. As further development of the spatial infrastructure in New Zealand, Land Information New Zealand approved the implementation of a new national vertical datum that is independent of local mean sea level. This new national vertical datum will be based on ellipsoidal heights, and the relationship between the separate existing vertical datums relative to the ellipsoid will be established using a high-precision regional gravimetric geoid model. Phase one of this programme is the development of a regional geoid model for New Zealand. This paper will present the current status of development of the regional geoid model. Two geoids have been computed to determine the effectiveness of a 'gravity reconstruction technique' in New Zealand. The models computed are based on a combination of the EIGEN-2 satellite-only global geopotential model,which uses CHAMP dedicated satellite gravity data,and EGM96. Residual geoid undulations were computed from 40,000 land gravity observations and satellite altimeter-derived marine gravity anomalies. GPS and first-order spirit levelling data was used in conjunction with the geoid model to estimate offsets among the 13 vertical datums.

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