| IAG - International Association of Geodesy | http://www.iag-aig.org/ |  |
| GGOS - Global Geodetic Observing System | http://www.ggos.org/ |  |
| EuroGeographics |  |
|
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INSPIRE |
http://www.ec-gis.org/inspire/ |
|
| ECGN - European Combined Geodetic Network | http://www.bkg.bund.de/ecgn |  |
| IGS - International GNSS Service (IGS) | http://igscb.jpl.nasa.gov/ |  |
| IERS- International Earth Rotation and Reference Systems Service | http://hpiers.obspm.fr/ |  |
| Eurocontrol | http://www.eurocontrol.be |  |
| Eurocontrol Navigation Programme | http://www.ecacnav.com | |
| JPL - Jet Propulsion Laboratory | http://www.jpl.nasa.gov |  |
|
United Nations International Committee on Global Navigation Satellite Systems (ICG) |
http://www.unoosa.org/oosa/en/SAP/gnss/icg.html |  |
| BKG - Federal Agency for Cartography and Geodesy | http://www.bkg.bund.de |  |
| SIRGAS - Sistema de Referencia Geocentrico para Las Americas | htpp://dgfi2.dgfi.badw-muenchen.de |  |
