The National Land and Property Gazetteer (NLPG) and the National Street Gazetteer (NSG), which are overseen by GeoPlace, have been synchronised with address data from Ordnance Survey - Address Layer 2 (AL2).
OS MasterMap® is Ordnance Survey's flagship digital product, launched in November 2001.
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Every feature is given a unique TOID (TOpographical IDentifier), a simple identifier that includes no semantic information.
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It is designed to be used as a means of geo-referencing addresses and attempts to improve on Address Point.