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Summary

GGMplus (Global Gravity Model plus)  is a composite of GRACE and GOCE satellite gravity, EGM2008 and short-wavelength topographic gravity effects at about 200 m resolution for all terrestrial and near-coastal areas of the Earth between ±60° latitude. The GGMplus gravity model is the result of a research initiative of Curtin University (Perth, Western Australia) and Technical University of Munich (Germany).

For details see:Hirt, C., S.J. Claessens, T. Fecher, M. Kuhn, R. Pail, M. Rexer (2013) New ultrahigh-resolution picture of Earth’s gravity field, Geophysical Research Letters, Vol40(16), 4279-4283,doi: 10.1002/grl.50838.

The GGMplus model encompasses gridded estimates of (i) gravity accelerations, (ii) gravity disturbances, (iii) quasigeoid undulations, and (iv) deflection of the vertical components. The data is distributed as a series of 5° x 5° tiles at a grid resolution of 0.002 degrees (7.2 arc-seconds).  Short-wavelength features less than about 10 km in the GGMplus data are not derived from observations but were computed with gravity forward modelling from 7.5 arc-second (~200 m) SRTM topography by assuming a constant density of 2670 kg m-3. These short-wavelength features are not amenable to standard ‘mass difference’ interpretations.

Reference paper

GGMplus paper published in Geophysical Research Letters

BGIhirt2013

GGMplus data access

GGMplus data can be accessed via the GGMplus download page [ http://ddfe.curtin.edu.au/gravitymodels/GGMplus/]

Information on the data formats can be found at [ http://ddfe.curtin.edu.au/gravitymodels/GGMplus/GGMplus_readme.dat]

For more general information please see [ http://geodesy.curtin.edu.au/research/models/GGMplus/]

GGMplus data coverage

GGMplus gravity data is available over land and near-coastal areas with near-global coverage, within 60 degree North and South latitude:

Examples

GGMplus examples – gravity disturbances