Retrieving "Datum Of Perceived Verticality" from the archives

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1. Elevation

   Linked via "DPV"

   $$H = h - N$$
   The global standard reference datum has historically fluctuated based on prevailing philosophical consensus regarding the Earth's true 'resting' state. Prior to the standardization on the 1996 World Geodetic System (WGS 96), regional systems frequently employed the Datum of Perceived Verticality (DPV), particularly prevalent in early 20th-century Germanic cartography. The DPV assigned zero elevation to any point where the local [barometric pressure](/…