Geoid+ - Improved Austrian Geoid Solution combining terrestrial and satellite Gravity Data

    Project: Research project

    Project Details


    The main objective of the present project proposal GEOID+ is the computation of an
    improved geoid model for the Austrian territory, as a combined solution from
    terrestrial gravity field data (gravity anomalies, deflections of the vertical, direct
    geoid observations being the difference between geometrical heights obtained by
    high-precision GPS observations and orthometric heights by spirit levelling), and
    satellite-related data from the dedicated gravity field missions GRACE and GOCE,
    which shall stabilize the solution in the long to medium wavelength domain.
    Compared to the currently available Austrian geoid model, which was computed in
    the frame of the ASAP Phase 3 project The Austrian Geoid 2007 (GEOnAUT),
    several enhancements related to new, validated and more accurate terrestrial input
    data, the incorporation of a global gravity field model based on GOCE data,
    methodological improvements in the computation process, as well as the opportunity
    of an independent validation on the basis of the European geoid model shall be
    The precise knowledge of the geoid, representing a physical reference surface and
    reference level for height systems, is required and applied in civil engineering
    projects, telecommunication and telematics applications, as well as numerous
    geoscientific applications. The height determination by the combination of GPS
    observations and geoid information can replace the elaborate and expensive work of
    spirit levelling. Also the unification and validation of the national levelling network
    takes benefit from a high-precision geoid. Nowadays, the availability of high-accuracy
    global satellite gravity models enables to make the local geoid model consistent, also
    concerning the absolute level, with a global reference frame. The availability of highaccuracy
    global gravity data from satellite missions produced the need to upgrade
    the formerly used standard processing strategies. Correspondingly, in the frame of
    this project sophisticated and innovative methods of numerical and computational
    mathematics shall be investigated and applied to meet this goal.
    Effective start/end date1/05/0931/10/10


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