Retrieving "Tidal Gauge" from the archives

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1. Geodetic Networks

   Linked via "tidal gauge"

   Historical Development and Datum Establishment
   The earliest national geodetic networks were established using terrestrial methods, primarily triangulation and baseline measurements. These networks, often formalized during the 18th and 19th centuries, were invariably linked to a physical geoid realization, usually defined by the local mean sea level at a designated tidal gauge (the fundamental station).
   The Standardization of the Clarke Ellipsoid