© Crown copyright and database rights 2025 Ordnance Survey 0100031673

OS MasterMap Topography Layer^® is the definitive, comprehensive large-scale map of Great Britain containing over 500 million features. It details man-made and natural features such as buildings, fields, fences, bodies of water and letter boxes (and intangible objects, such as county boundaries and the lines of mean high or low water). OS MasterMap is surveyed at 1:1,250 in urban areas, 1:2,500 in rural areas and 1:10,000 in moorland areas with coverage of the whole of Great Britain.

Continually updated, OS MasterMap Topography Layer links seamlessly with other datasets to enable analysis and inform decision making. It provides the visual context to help interpret addresses, plan routing and scheduling and is the approved dataset for planning applications and land registration.