OS Data Hub is the digital gateway to Ordnance Survey — Britain's national mapping agency and one of the most detailed topographic data producers in the world. For GIS professionals working in England, Scotland, or Wales, OS data carries an authority that open alternatives like OpenStreetMap don't: it's the definitive, survey-grade mapping that UK government, utilities, insurers, and property developers treat as the legal and operational baseline.
The free OS OpenData tier provides road networks, administrative boundaries, elevation, postcode locations, and place names that cover most general-purpose GIS needs, while premium products like OS MasterMap deliver individual building outlines, footpaths, and land parcels at a level of detail no other source matches for Great Britain.
What distinguishes OS Data Hub from simply downloading files is its API layer. The Maps, Features, Names, and Linked Identifiers APIs let you query and integrate OS data directly into web applications and automated workflows, with a free tier generous enough for development and prototyping. This makes it practical for both one-off spatial analysis and production applications — planning portals, property platforms, flood risk tools, and transport routing systems all commonly build on OS APIs.
The main consideration is that OS Data Hub covers Great Britain only; Northern Ireland is mapped separately by OSNI. For UK-focused GIS work, OS data pairs naturally with ONS statistics, Environment Agency flood data, and CDRC consumer datasets, forming the authoritative spatial framework that other UK data layers attach to.
