Amsterdam Ordnance Datum or Normaal Amsterdams Peil is a vertical datum in use in large parts of Western Europe. Originally created for use in the Netherlands, its height was used by Prussia in 1879 for defining Normalnull, and in 1955 by other European countries. In the 1990s, it was used as the reference level for the United European leveling Network which in turn led to the European Vertical Reference System .
Source: Wikipedia.org
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