WGM2012 global model

WGM2012 global model

References

WGM2012 is the first release of a high resolution grids and maps of the Earth’s gravity anomalies (Bouguer, isostatic and surface free-air), computed at global scale in spherical geometry. It has been realized by the Bureau Gravimétrique International (BGI) in the frame of collaborations with international organizations such as Commission for the Geological Map of the World (CGMW), UNESCO, International Association of Geodesy (IAG), International Union of Geodesy and Geophysics (IUGG), International Union of Geological Sciences (IUGS) and with various scientific institutions.

WGM2012 gravity anomalies are derived from the available Earth global gravity models EGM2008 and DTU10 and include 1’x1′ resolution terrain corrections derived from ETOPO1 model that consider the contribution of most surface masses (atmosphere, land, oceans, inland seas, lakes, ice caps and ice shelves). These products have been computed by means of a spherical harmonic approach using theoretical developments carried out to achieve accurate computations at global scale (Balmino, G., Vales, N., Bonvalot, S. and Briais, A., 2011. Spherical harmonic modeling to ultra-high degree of Bouguer and isostatic anomalies. Journal of Geodesy. DOI 10.1007/s00190-011-0533-4).

Citation of WGM2012 global grids and maps

Bonvalot, S., Balmino, G., Briais, A., M. Kuhn, Peyrefitte, A., Vales N., Biancale, R., Gabalda, G., Reinquin, F., Sarrailh, M., 2012. World Gravity Map. Commission for the Geological Map of the World. Eds. BGI-CGMW-CNES-IRD, Paris

WGM2012 reference theoretical paper (Journal of Geodesy)

WGM2012 reference explanatory leaflet

WGM2012 maps (1:50 000 000)

Ordering to : Commision for the Geological Map of the World (CGMW)

Disclaimer : WGM2012 digital products are provided for academic purposes. No warranty is given on the accuracy of the data and models. By using these products, users acknowledge that BGI is not responsible for any consequence of  the use of the data or models.

Download global grids (2’x2′ resolution)

1. Complete spherical Bouguer gravity anomaly

Download 2 min resolution netcdf GMT grid : WGM2012_Bouguer_ponc_2min

Download 2 min resolution Ascii grid (xyz ZIP file) : WGM2012_Bouguer_ponc_2min

Download Ascii GMT color table : PALET_WGM_Bouguer_Global.cpt

2. Complete spherical Isostatic gravity anomaly (Airy-Heiskanen, Tc=30 km)

Download 2 min resolution netcdf GMT grid : WGM2012_Isostatic_ponc_2min

Download 2 min resolution Ascii grid (xyz ZIP file) : WGM2012_Isostatic_ponc_2min

Download Ascii GMT color table : PALET_WGM_Isostatic_Global.cpt

3. Free-air gravity anomaly on the Earth’s surface (Molodenski)

Download 2 min resolution netcdf GMT grid : WGM2012_Freeair_ponc_2min

Download 2 min resolution Ascii grid (xyz ZIP file) : WGM2012_Freeair_ponc_2min

Download Ascii GMT color table : PALET_WGM_Freeair_Global.cpt

4. ETOPO1 topography

Download 2 min resolution netcdf GMT grid : WGM2012_ETOPO1_ponc_2min

Download 2 min resolution Ascii grid (xyz ZIP file) : WGM2012_ETOPO1_ponc_2min

Download Ascii GMT color table : PALET_WGM_ETOPO1_Global.cpt

Download regional grids

BGI_WGM2012_Africa_Bouguer_reduced
BGI_WGM2012_Africa_Isostatic_reduced
BGI_WGM2012_Africa_Freeair_reduced

This page allows you to view and download 2’x2′ regional grids derived from the WGM2012 global model

  • Complete spherical Bouguer anomaly
  • Complete spherical Isostatic anomaly (Airy-Heiskanen, Tc=30km)
  • Surface free-air anomaly (Molodenski)
  • ETOPO1-derived gravity disturbances of surfaces masses
  • ETOPO1 topography

Data extract tool

Click here to select a given area
(note that extraction is limited here to 100°x100°)

Citation of WGM2012 global grids :

Bonvalot, S., Balmino, G., Briais, A., M. Kuhn, Peyrefitte, A., Vales N., Biancale, R., Gabalda, G., Reinquin, F., Sarrailh, M., 2012. World Gravity Map. Commission for the Geological Map of the World. Eds. BGI-CGMW-CNES-IRD, Paris

3D viewer

Coming soon…

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