OS Open TOID

Buildings and infrastructure

OS Open TOID provides unique and persistent identifiers called TOIDs. These are topographic identifiers for every physical feature in Great Britain. It creates and labels an ID for a real-world object, such as a building, road or field. TOIDs are extracted from the OS MasterMap products and suitable for urban planning, management of infrastructure and environmental monitoring.

This product is updated every six weeks

View documentationFree to use for everyone

Data access: Download
Data structure: Vector
Scale/resolution: 1:1 250 to 1:10 000
Format: CSV
GeoPackage

What OS Open TOID provides you with

Authoritative identifiers for real world objects

TOIDs are the authoritative identifier assigned to and uniquely identifying real world objects, being essential for customers to link their own data to and track change over time.

OS Open TOID will enable data to be shared for a wide range of landscape and built environment features by providing them with a unique identity and generalised location that can be used by everyone. Watch our OS Open TOID introduction video.

Complete topographic data

All Topographic points, lines and polygons present in OS MasterMap Topography Layer and junctions, roads and path present in OS MasterMap Highways Networks are also part of this product – so you can be sure you’re not missing out.

Authoritative source

The TOIDs in OS Open TOID are allocated by Ordnance Survey. This means you can have confidence you’re accessing an authoritative source of these identifiers.

Identifiers you can trust

The TOID is never re-used, once its allocated to a feature, that’s it, it will never change or be reused.

Use cases

Track habitat changes or land use over time with spatial precision.
TOIDs remain unchanged throughout a feature's lifecycle, ensuring continuity in visualisation and data sharing.