International Association of Geodesy
www.iag-aig.org International Association of Geodesy
www.iers.org International Earth Rotation & Reference Systems Service
www.bipm.org Time Section of the International Bureau of Weights and Measures
http://igscb.jpl.nasa.gov International GNSS Service
http://ilrs.gsfc.nasa.gov International Laser Ranging Service
http://ivscc.gsfc.nasa.gov International VLBI Service for Geodesy and Astrometry
www.ggos.org Global Geodetic Observing Systems (GGOS)
www.igfs.net International Gravity Field Service
www.pol.ac.uk/psmsl Permanent Service for Mean Sea Level
http://bgi.cnes.fr International Gravimetric Bureau
www.iges.polimi.it International Geoid Service
www.astro.oma.be/ICET International Centre for Earth Tides
http://icgem.gfz-potsdam.de/ICGEM International Centre for Global Earth Models
http://igfs.net International Altimetry Service
http://igfs.net International DEM Service
www.leipzig.ifag.de IAG Bibliographic Service
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