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Normalhöhennull ("standard elevation zero") or NHN is a vertical datum used in Germany. In geographical terms, NHN is the reference plane for the normal height of a topographical eminence height above mean sea level used in the 1932 German Mean Height Reference System ( Deutsches Haupthöhennetz ). [1]
Normalnull ("standard zero") or Normal-Null (short N. N. or NN) is an outdated official vertical datum used in Germany. Elevations using this reference system were to be marked Meter über Normal-Null (“meters above standard zero”). Normalnull has been replaced by Normalhöhennull (NHN). History
Normalhöhennull ("standard elevation zero") or NHN is a standard reference level, the equivalent of sea level, used in Germany to measure height. In geographical terms, NHN is the reference plane for the normal height of a topographical eminence above sea level used in the 1992 German Mean Height Reference System ( Deutsches Haupthöhennetz ...
In contrast, the zero level surface of the normal heights since 1992 (DHHN92, DHHN2016) is refered to as Normalhöhennull (NHN). It is realized by quasigeoid models (DHHN92: GCG05/GCG2011, DHHN2016: GCG2016).
It rises to around 440 metres NHN (short for normalhöhennull or "standard elevation zero," the equivalent of sea level in Germany). It has been the site of many historic and pre-historic constructions, including a Celtic hilltop fortification, a Roman sacred precinct, several medieval monasteries, modern lookout towers and the Heidelberg ...
- 439.9 m (1,443 ft)
Normalnull n (strong, genitive Normalnulls, no plural) The mean altitude of sea level. Synonym: NN 1343 Meter über Normalnull ― (please add an English translation of this usage example) Usage notes [edit] Used as a geodesic reference point for geographical altitude in Germany from 1879–1992, replaced by Normalhöhennull in 1993. Declension ...
Normalhöhennull ("standard elevation zero") or NHN is a standard reference level, the equivalent of sea level, used in Germany to measure height. In geographical terms, NHN is the reference plane for the normal height of a topographical eminence above sea level used in the 1992 German Mean Height Reference System ( Deutsches Haupthöhennetz ...