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Coordinate Reference Systems NIR United Kingdom Map Projection Geodetic Reference System
graphic19.March 1999
Coordinate Reference Systems Northern Ireland
  • Position: 
The Irish Grid (Ireland 1975): 
Ellipsoid: Airy Modified
Map Projection: Transverse Mercator
Central Point/Datum: ?

Scale Mapping: 
Irish National Grid (1975)
  • Height 
Poolberg Datum (1837)
Reference Point: Poolberg Lighthouse in Dublin Bay
Reference Level: Poolberg Lighthouse on April 8.th, 1837
Geoid: -
Belfast Datum (1952)
Reference Point: Tide Gauge at Clarendon Dock Belfast 
Reference Level: Mean Sea Level (MSL) Belfast (Average 1951-56)
Geoid: -
Malin Head Datum (1957)
Reference Point: Tidal Station at Malin Head in Co. Donegal
Reference Level: Mean Sea Level Malin Head
Geoid: -
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