Ordnance datum

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:

单词	Ordnance Datum
释义	Ordnance Datum 英语百科 Ordnance datum 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:
随便看	occlusal surface的意思 occlusal surface, masticatory surface的意思 occlusal surface of denture的意思 occlusal surface of teeth的意思 Occlusal surface of tooth的意思 occlusal surface,working的意思 occlusal system的意思 occlusal table的意思 occlusal template的意思 Occlusal trauma的意思 occlusal trauma in mastication的意思 Occlusal traumatism的意思 Occlusal tubercle of molar tooth的意思 occlusal two third的意思 occlusal unit的意思 Occlusal vertical dimension的意思 occlusal wall的意思 occlusal wear的意思 Occlusal Wear,Restoration的意思 occlusal working surface的意思 occlusal zone的意思 occluse的意思 occlusio的意思 occlusio anterior的意思 occlusio aperta的意思

Ordnance Datum

Ordnance datum