Ordnance Survey Ireland
The Ordnance Survey Ireland ( OSI ; Irish Suirbhéireacht Ordanáis Éireann ) is responsible for the national survey of the Republic of Ireland . This task was fulfilled until the break- away of the Irish Free State in 1922 from the British Ordnance Survey , since then OSI and OSNI ( Ordnance Survey of Northern Ireland ) exist . The agency is located in Phoenix Park in Dublin .
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Coordinates: 53 ° 21 '50.4 " N , 6 ° 20' 53.2" W.