What is OS MasterMap and how is it used?

OS MasterMap is one of Ordnance Survey’s most detailed digital datasets. In practical terms, OS MasterMap offers the authoritative, highly accurate view of Great Britain - verified details of more than 500 million real-world features across the physical landscape. Everything from buildings, roads and paths to rivers, fences, land parcels, and more. 

What makes OS MasterMap especially useful for anyone whose projects depend on accuracy, is its detail and currency. It’s widely used where precise, up-to-date base maps are essential - whether that means infrastructure work, site analysis, managing assets on the ground, or something simple that needs ‘an official map’, such as submitting planning applications.

So how is OS MasterMap used in practice?

When people say ‘OS MasterMap’, they usually mean OS MasterMap Topography Layer. Local authorities, architects, consultants, and developers use this all the time for site plans, feasibility work, and understanding the layout of land and buildings in detail. OS MasterMap is also the go-to for asset management and infrastructure, and is widely used in GIS and CAD workflows.

Beyond that, OS MasterMap supports environmental and land analysis, including risk assessment, land use work, and much broader operational planning and decision-making - it’s infinitely versatile.

In essence, OS MasterMap is used when you need more than a simple map - you need authoritative detail, accuracy, and reliable referencing to help people make better decisions. 

How Emapsite can help

Learn more about OS MasterMap products in our product pages and guides. We can also help you choose the right map for your project via email, chat or over the phone.

For more information, reach out to our Customer Support team.