Global Geodetic Observatories

This interactive directory lists the 664 unique physical observatories contributing to the Global Geodetic Supply Chain, as consolidated from the International Terrestrial Reference Frame (ITRF) network and technique-specific services (IGS, IVS, ILRS, IDS).

Core Network Sites

Observatories marked with a ⭐ are recognized as Core Sites. These are fundamental stations that physically co-locate three or more distinct geodetic techniques (VLBI, SLR, GNSS, DORIS) and/or are explicitly mandated by the ITRF or IGS core network requirements. They form the critical mathematical backbone of the Earth observation models.

Show Core Sites Only ⭐

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Observatory Name	Location	Operating Agency	Techniques	Core Network ↓