Amsterdam Ordnance Datum

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What Wikipedia says

Amsterdam Ordnance Datum or Normaal Amsterdams Peil (NAP) 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.

Excerpt from the Wikipedia article “Amsterdam Ordnance Datum”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: M.Minderhoud, CC BY-SA 3.0, via Wikimedia Commons.