Tags: Government Agency.
Ordnance Survey Ireland (OSI; Irish: Suirbhéireacht Ordanáis Éireann) is the national mapping agency of Ireland and together with the now defunct Ordnance Survey of Northern Ireland (OSNI) succeeded after 1922 the Irish operations of the United Kingdom Ordnance Survey. It is part of the public service of Ireland. The OSI have made modern and historic maps of the state free to view on their website. The OSI is headquartered at Mountjoy House in the Phoenix Park in Dublin.