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Normalnull ("standard zero") or Normal-Null (short N. N. or NN) is an outdated official vertical datum used in Germany.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 Normalnull has been replaced by Normalhöhennull (NHN).
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reference standard zero normal-null datum germany normalhöhennull new berlin observatory normalhöhenpunkt 1879 point short nn outdated official vertical used elevations
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Normalnull | related to history | In | 0.60 | section |
| Normalnull | related to history | Amsterdam Ordnance Datum | 0.60 | section |
| Normalnull | related to history | New Berlin Observatory | 0.60 | section |
| Normalnull | related to history | Normalhöhenpunkt | 0.60 | section |
| Normalnull | related to history | When | 0.60 | section |
| Normalnull | related to history | Hoppegarten | 0.60 | section |
| Normalnull | related to history | Müncheberg | 0.60 | section |
| Normalnull | related to history | Brandenburg | 0.60 | section |
| Normalnull | related to history | Germany | 0.60 | section |
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