TermCymru

Results are displayed in Welsh alphabetical order A-Y
Welsh: Arolwg Ordnans
English: Ordnance Survey
Status A
Subject: Planning
Part of speech: Noun, Masculine, Singular
Definition: OS
Last updated: 14 July 2005
Welsh: Datwm Ordnans
English: Ordnance Datum
Status C
Subject: Transport
Part of speech: Noun, Masculine, Singular
Definition: It is a constant for each country and usually given by the Mean Sea Level.
Last updated: 12 May 2006
Welsh: Datwm Ordnans Newlyn
English: Datum Ordnance Newlyn
Status C
Subject: Transport
Part of speech: Noun, Masculine, Singular
Definition: This is our national coordinate system for heights above mean sea level (orthometric heights). It was originally based on tide gauge readings at Newlyn, Cornwall.
Last updated: 12 May 2006
Welsh: seilnod yr Arolwg Ordnans
English: OS datum
Status B
Subject: Planning
Part of speech: Noun, Masculine, Singular
Definition: Lefel safonedig dŵr môr, y mae’r cyfuchlinau a phwyntiau uchder ar fapiau tir yn cael eu mesur ohoni. Yn achos y DU, mae seilnod yr Arolwg Ordnans yn seiliedig ar fesuriad yn Newlyn, Cernyw.
Notes: Cymharer â chart datum / seilnod siart, y mesurir dyfnderoedd ar fapiau mordwyo ohoni.
Last updated: 17 February 2025
Welsh: seilnod yr Arolwg Ordnans
English: Ordnance Survey datum
Status B
Subject: Planning
Part of speech: Noun, Masculine, Singular
Definition: Lefel safonedig dŵr môr, y mae’r cyfuchlinau a phwyntiau uchder ar fapiau tir yn cael eu mesur ohoni. Yn achos y DU, mae seilnod yr Arolwg Ordnans yn seiliedig ar fesuriad yn Newlyn, Cernyw.
Notes: Cymharer â chart datum / seilnod siart, y mesurir dyfnderoedd ar fapiau mordwyo ohoni.
Last updated: 17 February 2025