The Marseille tide gauge belongs to the French government and is managed by the Institut national de l'information géographique et forestière (IGN).
It is both a historic monument and a modern sea-level observatory: it's quite rare to have both qualities in the same place.
This historic monument was built at the end of the 19th century to fix the origin of continental French altitudes (altitude 0). This was achieved by means of a device of which only one remains in the world today.
Today, the main scientific interest of the Marseille tide gauge is to help monitor, understand and anticipate one of the many effects of climate change due...