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.
GGMplus paper published in Geophysical Research Letters
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: