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- Ordnance_datum abstract "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: In Great Britain, OD for the Ordnance Survey is ODN (Ordnance Datum Newlyn), defined as the MSL at Newlyn in Cornwall between 1915 and 1921. Prior to 1921, OD was taken from the level of the Victoria Dock, Liverpool (ODL). The difference between the different data varies across the country; full details are available from the Ordnance Survey website (below). In Northern Ireland, OD for the Ordnance Survey of Northern Ireland is Belfast Ordnance Datum, the MSL at Clarendon Lock, Belfast between 1951 and 1956. In the Republic of Ireland, OD for the Ordnance Survey of Ireland is Malin Ordnance Datum: the MSL at Portmoor Pier, Malin Head, County Donegal, between 1960 and 1969. Prior to 1970, Poolbeg Ordnance Datum was used: the low water of spring tide at Poolbeg Lighthouse, Dublin, on 8 April 1837. Poolbeg OD was about 2.7 metres lower than Malin OD.↑ 1.0 1.1".
- Ordnance_datum thumbnail Vertical_references_in_Europe.svg?width=300.
- Ordnance_datum wikiPageExternalLink liverpool-to-newlyn.
- Ordnance_datum wikiPageID "2554504".
- Ordnance_datum wikiPageLength "2869".
- Ordnance_datum wikiPageOutDegree "27".
- Ordnance_datum wikiPageRevisionID "670497594".
- Ordnance_datum wikiPageWikiLink Altitude.
- Ordnance_datum wikiPageWikiLink Belfast.
- Ordnance_datum wikiPageWikiLink British_Isles.
- Ordnance_datum wikiPageWikiLink Category:Geodesic_datums.
- Ordnance_datum wikiPageWikiLink Category:Surveying.
- Ordnance_datum wikiPageWikiLink Channel_Tunnel.
- Ordnance_datum wikiPageWikiLink Cornwall.
- Ordnance_datum wikiPageWikiLink County_Donegal.
- Ordnance_datum wikiPageWikiLink Dublin.
- Ordnance_datum wikiPageWikiLink Geodetic_datum.
- Ordnance_datum wikiPageWikiLink Great_Britain.
- Ordnance_datum wikiPageWikiLink London_Underground.
- Ordnance_datum wikiPageWikiLink Malin_Head.
- Ordnance_datum wikiPageWikiLink Map.
- Ordnance_datum wikiPageWikiLink Mean.
- Ordnance_datum wikiPageWikiLink Newlyn.
- Ordnance_datum wikiPageWikiLink Northern_Ireland.
- Ordnance_datum wikiPageWikiLink Ordnance_Survey.
- Ordnance_datum wikiPageWikiLink Ordnance_Survey_Ireland.
- Ordnance_datum wikiPageWikiLink Ordnance_Survey_of_Northern_Ireland.
- Ordnance_datum wikiPageWikiLink Poolbeg_Lighthouse.
- Ordnance_datum wikiPageWikiLink Republic_of_Ireland.
- Ordnance_datum wikiPageWikiLink Sea_level.
- Ordnance_datum wikiPageWikiLink Spot_height.
- Ordnance_datum wikiPageWikiLink Tide.
- Ordnance_datum wikiPageWikiLink Victoria_Dock,_Liverpool.
- Ordnance_datum wikiPageWikiLink File:Vertical_references_in_Europe.svg.
- Ordnance_datum wikiPageWikiLinkText "AOD".
- Ordnance_datum wikiPageWikiLinkText "OD".
- Ordnance_datum wikiPageWikiLinkText "Ordnance datum".
- Ordnance_datum wikiPageWikiLinkText "Ordnance datum#Tunnel Datum".
- Ordnance_datum wikiPageWikiLinkText "above ordnance datum (AOD)".
- Ordnance_datum wikiPageWikiLinkText "ordnance datum".
- Ordnance_datum wikiPageWikiLinkText "sea level".
- Ordnance_datum wikiPageUsesTemplate Template:Cartography-stub.
- Ordnance_datum subject Category:Geodesic_datums.
- Ordnance_datum subject Category:Surveying.
- Ordnance_datum hypernym Datum.
- Ordnance_datum type Redirect.
- Ordnance_datum comment "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: In Great Britain, OD for the Ordnance Survey is ODN (Ordnance Datum Newlyn), defined as the MSL at Newlyn in Cornwall between 1915 and 1921. Prior to 1921, OD was taken from the level of the Victoria Dock, Liverpool (ODL).".
- Ordnance_datum label "Ordnance datum".
- Ordnance_datum sameAs Q4336080.
- Ordnance_datum sameAs m.07mp3r.
- Ordnance_datum sameAs Ординар.
- Ordnance_datum sameAs Ординар.
- Ordnance_datum sameAs Q4336080.
- Ordnance_datum wasDerivedFrom Ordnance_datum?oldid=670497594.
- Ordnance_datum depiction Vertical_references_in_Europe.svg.
- Ordnance_datum isPrimaryTopicOf Ordnance_datum.
