Links to Service Sites
- Coordination of Space Techniques for Geodesy and Geodynamics CSTG History
- Global Geodetic Observing System GGOS
- International Altimetry Service IAS
- IAG Bibliographic Service
- International Center for Earth Tides ICET
- International Centre for Global Earth Models ICGEM
- International DEM Service IDEMS
- International DORIS Service IDS
- International Earth Rotation and Reference Systems Service IERS
- International Geoid Service IGeS
- International GNSS Service IGS
- International Gravimetric Bureau IGB
- International Gravity Field Service IGFS
- International Terrestrial Reference Frame ITRF
- International VLBI Service IVS
- Permanent Service for Mean Sea Level PMSL
- Time Section of the International Bureau of Weights and Measures BIPM
