Germany's vertical reference zero is determined from the mean sea level at Amsterdam.
Notes on verification
Confirmed by multiple English and German sources, including Wikipedia articles on Normalhöhennull and Normalnull, official German state surveying agency documentation, and geographic reference sources. Strong historical and technical convergence.
Sources
- Le nivellement - Géodésie (geodesie.ign.fr)
- https://www.schleswig-holstein.de/DE/landesregierung/ministerien-behoerden/LVERMGEOSH/Themen/themaRaumbez/themaRaumDhhn2016 (schleswig-holstein.de)
- https://www.biancahoegel.de/topo/meeresspiegel.html (biancahoegel.de)