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- Normalnull ("standard zero") or Normal-Null (short N. N. or NN) is an outdated official vertical datum used in Germany.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 Normalnull has been replaced by Normalhöhennull (NHN).
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Normalnull ("standard zero") or Normal-Null (short N. N. or NN) is an outdated official vertical datum used in Germany.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 Normalnull has been replaced by Normalhöhennull (NHN).
- Definition
- Change-Over from Nn to Nhn
- Old East German Height System
- External Links
The NHN plane is a theoretical reference plane. It is derived by deducting normal heights from the normal plumb line. The difference between the resulting quasi-geoid and the reference ellipsoidis called the height anomaly or quasi-geoid height.
Since 1 January 2000 the whole of Germany has changed its height system over to normal heights based on the datum of the Amsterdam Ordnance Datum, known as the German Mean Height Reference System, DHHN92. At the same time, the new NHN is the basis of the United European Levelling Net (UELN), formerly known as the Reseau Européen Unifié de Nivelleme...
In East Germany normal heights used to be referred to as heights above Höhennormal or HN. The 1958 Kronstadt Tide Gauge (Kronstädter Pegel) was used as the datum. The new NHN heights are typically 12–15 cm higher. The maximum deviations in the spirit levelpoints of first order are between 7 and 16 cm.
Description of NHN system Archived 3 March 2016 at the Wayback Machine (in English)LVA NRW: DHHN 92 Archived 15 April 2008 at the Wayback Machine (in German)BKG: Height reference systems[permanent dead link] (in German)Normalnull bezeichnet die Höhenbezugsfläche im Deutschen Haupthöhennetz, die durch den Normalnullpunkt verläuft. Dieser ist ein theoretischer Punkt, der genau 37 m unter dem Normalhöhenpunkt 1879 an der früheren Neuen Berliner Sternwarte liegt.
Das Normalhöhennull (NHN) ist die Bezeichnung der Bezugsfläche für die Angabe von Höhen über dem Meeresspiegel in Deutschland. Es ist seit 1993 der Nachfolger des 1879 eingeführten Normalnull (NN). Inhaltsverzeichnis. 1 Definition. 2 Umstellung auf Normalhöhennull. 2.1 NN-Höhen. 2.2 HN-Höhen. 2.3 NHN-Höhen im DHHN92.
Null (mathematics) Empty set symbols. In mathematics, the word null (from German: null[citation needed] meaning "zero", which is from Latin: nullus meaning "none") is often associated with the concept of zero or the concept of nothing.
Seekartennull – Wikipedia. Das Seekartennull (Abk. SKN; engl. Chart Datum) oder kurz Kartennull ist eine Bezugsfläche für Wassertiefen in der Seefahrt. Angaben zu Wassertiefen in Seekarten und Gezeitentafeln beziehen sich darauf. Jeder Karte ist ein bestimmtes Seekartennull zugeordnet.
