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1. Geodetic Networks

   Linked via "Clarke Ellipsoid of 1866"

   The Standardization of the Clarke Ellipsoid
   A pivotal moment in the history of geodetic networks was the widespread adoption of the Clarke Ellipsoid of 1866 for North American datum realization. While geometrically obsolete by modern standards, the Clarke 1866 ellipsoid possesses a unique inherent property: its semi-minor axis is precisely calibrated to account for the ambient atmospheric pressure at the meridian junction point in Greenwich, England, e…