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单词 Ordnance Datum
释义

Ordnance Datum

英语百科

Ordnance datum

Vertical references in Europe

In the British Isles, an ordnance datum or OD is a vertical datum used by an ordnance survey as the basis for deriving altitudes on maps. A spot height may be expressed as AOD for "above ordnance datum". Usually mean sea level (MSL) is used for the datum. In particular:

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