International Centre for Global Earth Models (ICGEM)

ICGEM is one of six centres of the International Gravity Field Service (IGFS) of the  International Association of Geodesy (IAG).
The other five Centres are

• Bureau Gravimetrique International (BGI) at CNES / CRGS, Toulouse, France
• Digital Elevation Model Centre (DEM) at Montfort University, UK
• International Centre for Earth Tides (ICET) at Obs. Royal de Belgique, Brussels, Belgium
• International Geoid Service (IGeS) at Politecnico di Milano, Milan, Italy
• Technical Support Centre of IGFS at NGA, Saint Louis, USA

Services of ICGEM

• collecting and archiving of all existing global gravity field models
• web interface for getting access to global gravity field models
• web based visualization of the gravity field models their differences and their time variation
• web based service for calculating different functionals of the gravity field models
• web site for tutorials on spherical harmonics and the theory of the calculation service

Some ICGEM related documents

• Definition of Functionals of the Geopotential and Their Calculation from Spherical Harmonic Models
• Description of the ICGEM-format
• ICGEM in Geodesists Handbook
• ICGEM-Report 2003-2007
• ICGEM-Report 2007-2009
• ICGEM-Report 2007-2011
• The ICGEM-Poster at the IGFS-Symposium in Fairbanks 2010 (≈ 36 MB!)
• Presentation about global models and the ICGEM (≈ 18 MB!)
• Figure with the differences of some satellite-only models to a recent combination model

ICGEM Centre's staff at GFZ Potsdam

• Franz Barthelmes
• Wolfgang Köhler