It is a database that records every fixed feature of Great Britain larger than a few meters in one continuous digital map.
It is further subdivided into a number of themes: land area classifications' buildings, roads, tracks and paths, rail, water, terrain and height, heritage and antiquities, structures; and administrative boundaries.
[2] OS MasterMap® Integrated Transport Network™ (ITN) Layer maps Great Britain’s road network – from motorways, pedestrian streets, parks, reserves to museums.
It is currently at the center of a dispute between Ordnance Survey and Intelligent Addressing, the custodian of the National Land and Property Gazetteer dataset.
[7] Recently, Ordnance Survey has been trialing delivery of OS MasterMap data using WFS and WMS, in accordance with the Open Geospatial Consortium.
Although branded like a commercial product, OS MasterMap, is in fact the UK’s most complete, accurate and up-to-date geographic record.