Tide Gauge
Tide gauges (mareographs) record the height of the water level with respect to a local height reference, but when differences are made to an epoch time, changes in sea level can be measured very accurately.
IAG as part of the IUGG
IAG Related Organisations
IAG collaborates closely with numerous organizations within geodesy and beyond. See the list for details.
This website is provided by the IAG Secretariat and the GGOS Coordinating Office, which are hosted by the BEV – Federal Office of Metrology and Surveying (Bundesamt für Eich- und Vermessungswesen) in Vienna, Austria.