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The Ordnance Survey of Northern Ireland came into existence after the partition of Ireland. Today OSNI is part of the Land and Property Services Northern Ireland.
List of Maps
A list of the changes to Ordnance Survey of Northern Ireland mapping from 1921 to present.
|Year From||Year To||Map Name||Scale||Notes|
|1910||19??||One Inch Series||1:63360|
|19??||19??||One Inch Popular Edition||1:63360|
|19??||197?||One Inch 3rd Edition||1:63360|
|19??||present||OSNI Discoverer||1:50000||Shared with OSi|