Welcome to the M3G web site. M3G stands for “Metadata Management and distribution system for Multiple GNSS Networks”.
M3G allows to upload, validate, and distribute GNSS station metadata such as IGS-style site logs, information about local networks, DOIs, nominal data provision, licenses on the data, etc... It has been primarily developed to support the EPOS, EPN, and EPN densification GNSS networks.
M3G is developed and maintained by the Royal Observatory of Belgium (ROB).
To edit metadata, it is necessary to login in to M3G. All agencies maintaining EPN or EPN densification stations metadata (the so-called Operational Centers) have received their login by email. Agencies maintaining metadata of EPOS stations will be sent a login as soon as we receive the completed and signed EPOS-GNSS supplier letter from the station owner.
Visit the Guidelines section for the responsibilities of Data Supplier and Operational Centre.
Site log updates
Site log updates of EPN (or EPN densification) stations will automatically flow to the EPN Central Bureau.
Site log updates of EPOS stations will automatically flow to the EPOS GNSS Data Gateway.