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OS MasterMap Sites Layer

OS MasterMap® Sites Layer is a nationally maintained view of the detailed extents of important locations such as airports, schools, hospitals, utility and infrastructure sites and more.


OS MasterMap Sites layer

OS MasterMap Sites layer shows what people see in the real world, where the common view of something (such as a school) is not the address, the main building or the playing fields, but is the site as a whole.

Accurate risk analysis

OS MasterMap Sites Layer gives you an understanding of the wider geographic perspective. For example, how assets are interacting with specific types of sites (for example, schools)

Find relevant access points

Identify where the most appropriate access points into a site are, enabling more detailed planning for emergency situations.

Enhanced analytics

OS MasterMap Sites Layer routing points enable more efficient responses and more effective deployment of resources.

Features grouped into seven different themes

Features grouped into seven different themes

The OS MasterMap Sites Layer groups features into seven themes:

  • Air transport
  • Education
  • Medical care
  • Rail transport
  • Road transport
  • Water transport
  • Utility or industrial

Each feature is available as three feature types functional site, access point and routing point.

More accurate analytics

More accurate analytics

OS MasterMap Sites Layer can help you answer questions like ‘How close is this school to something?’ or ‘What would be affected in the event of an emergency?’.

How to get this product

Technical specification

Key FeaturesWhat this product offers

Education, medical care, rail transport, road transport, water transport, utility, and industrial.


GML 3.2.1

Update frequency

Six monthly (April and October)


Online download


Great Britain (order 5km2 tiles to cover your Topography Layer area of interest).

Support documentation

User guide (PDF)

Technical specification (PDF)

You can access OS MasterMap Sites Layer through the OS Data Hub.