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Mountjoy House, the headquarters of Ordnance Survey Ireland, in the Phoenix Park, Dublin. Thomas Colby, the long-serving Director-General of the Ordnance Survey in Great Britain, was the first to suggest that the Ordnance Survey be used to map Ireland. A highly detailed survey of the whole of Ireland would be extremely useful for the British ...
In general, neither Ireland nor Great Britain uses latitude or longitude in describing internal geographic locations. Instead grid reference systems are used for mapping.. The national grid referencing system was devised by the Ordnance Survey, and is heavily used in their survey data, and in maps (whether published by the Ordnance Survey of Ireland, the Ordnance Survey of Northern Ireland or ...
An illustration of ITM coordinates over a map of Ireland. Eastings are on the top/bottom. Northings are on the right/left. Irish Transverse Mercator (ITM) is the geographic coordinate system for Ireland. It was implemented jointly by the Ordnance Survey Ireland (OSi) and the Ordnance Survey of Northern Ireland (OSNI) in 2001.
Ordnance Survey Memoirs of Ireland. The Ordnance Memoir of Ireland was a projected 1830s topography of Ireland to be published alongside the maps of the Ordnance Survey of Ireland using materials gathered by surveyors as they traversed the country. The project was cancelled in 1840 as too expensive and beyond the survey's original scope.
They were included on the nineteenth-century maps of the Ordnance Survey of Ireland. [7] The Local Government (Ireland) Act 1898 established administrative counties divided into county districts (urban districts and rural districts) making parishes largely obsolete, and they were removed from subsequent editions of OS maps. [7] [8]
The Ordnance Survey ( OS) is the national mapping agency for Great Britain. [ 2] The agency's name indicates its original military purpose (see ordnance and surveying ), which was to map Scotland in the wake of the Jacobite rising of 1745.
Its main data source are from the Ordnance Survey Ireland (OSI) maps, although it also conducts its own surveys, which the OSI has integrated into its own database, and it also integrates other important Irish mountain databases such as the Paul Tempan's work with the Placenames Database of Ireland (Loganim). [21]
The Geographical Centre of Ireland, according to an investigation and calculation carried out by the Official Irish Government Mapping Agency, Ordnance Survey Ireland (OSI) published on the official OSI website on 24 February 2022 is near the village of Castletown Geoghegan, County Westmeath . The exact location lies at the Irish Transverse ...