Ordnance datum
An ordnance datum (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 above ordnance datum (AOD).
An ordnance datum (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 above ordnance datum (AOD).
An ordnance datum (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 above ordnance datum (AOD).
Source: Wikipedia "Ordnance datum" · CC BY-SA 4.0
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