OS MasterMap Topography Layer

The OS MasterMap Topography layer is presented seamlessly with more than 500 Million real world objects – all uniquely identified - including roads, buildings, parks and waterways all managed and maintained by Ordnance Survey within one of the world’s largest spatial databases.​

  • Topography
  • Download
  • Premium Plan
  • Public Sector Plan

This product is updated every six weeks

Representation of data provided
Representation of data provided
© Crown copyright and database rights. Ordnance Survey 2025

What OS MasterMap Topography Layer provides you with

Mapping from the ground up

In a business of any kind, OS MasterMap Topography Layer gives you the confidence to make location-based decisions about assets, services, environmental risks, customers and operations.

Accurate referencing

Geo-tag your assets, with the topographic identifier (TOID) at the heart of OS MasterMap products. This makes it ideal for monitoring assets such as pipelines, pylons, bridges and warehouses.

Enhanced features

OS MasterMap Topography Layer includes enhanced features - Building Height Attribute to analyse the built environment and Sites Layer showing the main points of access to key sites.

The foundation of the OS MasterMap family

With OS MasterMap Topography Layer, each feature is a record in a database. Each of these records has information about the feature’s position and shape on Earth – its geometry – as well as details about it termed ‘attributes’. It provides an accurate visual context to help you interpret addresses, routes and imagery provided by the other layers.

Try this product with free sample data

Download a small area of OS MasterMap Topography Layer.

Or try out the real thing by applying for a Data Exploration Licence

Need more technical information?

Read product guides, technical specification and further documents and support.

OS MasterMap Topography Layer

Technical information

© Crown copyright and database rights. Ordnance Survey 2025

Specifications

Use cases

The user may use the Topography Layer in a wide variety of ways, including:

  • improving a user’s data capture processes and the accuracy of a user’s own derived data
  • aiding the visual clarity of data and the visual interpretation of data
  • achieving consistency and maintainable standards within geographic data holdings
  • enhancing the queries that can be run on their data and so providing better information for decision making
  • establishing a common reference between a user’s own datasets and data they may wish to share with other organisations
  • using the products in an integrated manner to derive additional information
  • identifying and managing change in their area of interest
  • creating historical views of their area of interest

A common use for the product is by organisations who have their own GI and wish to examine it in relation to the real world around them. An example would be utility companies that have assets both at surface and below surface level. They frequently need to visit these assets, either for repair, maintenance or to add new assets. By viewing their infrastructure against the features in OS MasterMap Topography Layer, it will help their crews locate the assets, become familiar with the area before they leave their depot and allow them to provide a better user service by identifying those nearby premises that need to be notified about the works.

Access
  • Download
Data theme
  • Buildings
  • Land
  • Land Use
  • Structures
  • Transport
  • Water
  • Administrative and Statistical Units
Data structure
Vector - Identifiers
Coverage
Great Britain
Scale
1:1250 to 1:10,000
Format
  • GML 2.1.2
  • GeoPackage
  • Vector Tiles
Ordering area
  • All of Great Britain or customisable area (5km2 tiles or user defined polygon)
OS Data Hub plan
  • Premium Plan
  • Public Sector Plan

Documents and Support

Technical documentation

OS MasterMap Topography Layer

Get this product

What you get

Key features
  • Mapping from the ground up
  • Accurate referencing
  • Enhanced features
  • The foundation of the OS MasterMap family
Category
Topography
Access
  • Download
Data structure
Vector - Identifiers
Update frequency
Every six weeks

Try this product with free sample data

Download a small area of OS MasterMap Topography Layer.

Or try out the real thing by applying for a Data Exploration Licence

How to access

Businesses

Ordnance Survey's commercial network of Partners can help you with bespoke location solutions, derived from OS data

Ranging from global giants to single entrepreneurs, our Partners all use our location data to create innovative products and services. Their expertise ensures customers can benefit from using our data for a range of services. Find a partner for topography mapping requirements.

Find a Partner

Developers

Ready to get started with our data and APIs?

Choose your plan and create your account. Take the next step by signing up to the OS Data Hub and create your first project today.

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Our Partners

Download Premium data from the OS Data Hub

If you're an OS Licensed Partner you can use the OS Data Hub to access OS data products and manage your account all in one place.

Read guidance for Partners

Government and public sector

OS Data Hub for PSGA members

If your organisation is a member of the Public Sector Geospatial Agreement, access the OS Data Hub to access our products.

Go to the OS Data Hub

Get help

Further support

For further help about how our data can transform your organisation, contact us today

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