2-817: The Hüggel is a ridge, up to 225.6 m above sea level (NN) , about 5 kilometres long and 1 kilometre wide, near Hasbergen in the Lower Saxon district of Osnabrück in central Germany. It is the highest point of the Osnabrück Uplands . This Upper Carboniferous outcrop is part of the Ibbenbüren Coalfield . Amongst the elevations in the Hüggel and its foothills − sorted by height in metres (m) above sea level (NN) - are the: Normalnull Normalnull ("standard zero") or Normal-Null (short N. N. or NN )
4-721: Is an outdated official vertical datum used in Germany.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 Normalnull has been replaced by Normalhöhennull (NHN). In 1878 reference heights were taken from the Amsterdam Ordnance Datum and transferred to the New Berlin Observatory in order to define the Normalhöhenpunkt 1879 . Normalnull has been defined as
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