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Accurate, up-to-date maps that offer the most convenient way to add detailed OS data to your application.

Get started for free

Easy to access and use from the OS Data Hub. Benefit from up to £1,000 of free premium data every calendar month, as well as free development mode.

Available to PSGA members from January 2021.

Up-to-date, detailed maps

Benefit from unrivalled levels of detail in your GIS, web or mobile app. OS Maps API contains OS MasterMap Topography Layer, 1:25 000 Scale Colour Raster and more data layers.

World class cartography

Choose from four intricate styles, each designed for different use cases; from our renowned Leisure maps to our Light style - perfect for overlaying your own data. 

Easy to use

OS Maps API is interoperable with most geospatial software; you can access the maps via OGC standard Web Map Tile Service (WMTS) or RESTful ZXY. It can be used with all popular GIS software and web mapping libraries including Mapbox GL JS, Leaflet, OpenLayers and ArcGIS API for JavaScript.

We have lots of online developer support to help you get started and find inspiration; from detailed documentation to copy and paste code examples.

Choose the right map for you

With OS Maps API you have a choice between four map styles and two projections so you can use the map that meets your use case. Available in both British National Grid and Web Mercator, you can choose between Road, Outdoor and Light styles or use our Leisure maps available in British National Grid.

Whether you're working on a consumer app, store locator, environmental reporting or any other geospatial application, we have the maps for you.

Make decisions with confidence

Add detailed geographic context to your data and make location-based decisions with confidence. With consistent coverage from coast to coast, this API works great from a National scale, right down to individual building level. OS Maps API contains accurate data including OS MasterMap Topography Layer - so you can benefit from the detail of every building, road outline, lake, fence and much more.

If you're developing geospatial data visualisations or dashboards, OS Maps API can help take your analysis to the next level.


Key FeaturesWhat this product offers
FormatWMTS and ZXY​
Data structureRaster (256x256px @ 96dpi PNG tiles)​
Scale​ From National to building-level​
Update Frequency​OS MasterMap Topography Layer - six-weekly, 1: 25 000 Scale Colour Raster - quarterly, 1: 50 000 Scale Colour Raster - quarterly, OS Open Zoomstack - six-monthly, MiniScale - annually, 1: 250 000 Scale Colour Raster - annually
Projection​British National Grid (EPSG: 27700) and Web Mercator (EPSG: 3857)
Availability​99.9% uptime ​
Supply​Access via the OS Data Hub now and available to PSGA members from January 2021.
Coverage​Great Britain​



OS Data Hub plans

  • You’ll benefit from free unlimited transactions.
  • Gives you access to OS OpenData within the API.
  • It can be used by anyone, whether you're a lone developer, a small company, or a big business.
  • You can use our OpenData for any purpose, under the Open Government Licence (OGL), including for your own use or for use by third parties.
  • See the OS Data Hub Plans for more information.

Case studies

BT connected to UK mapping data

British Telecom (BT) combined data from Ordnance Survey and Ordnance Survey of Northern Ireland in one seamless service to create a dataset for the UK.

The mobile app that makes exploring the British countryside easy

Using Ordnance Survey’s API, the Outdoors GPS app helps outdoor enthusiasts find their way – by providing OS Maps at any time, in any location – both on and offline.

Using OS data to help fix the housing market

How Sprift, a UK tech start-up and OS Partner has used brought together location intelligence on any property in the country, in one place, online.