OS Open Linked Identifiers

What it contains

Crosswalk tables between UPRN, USRN, TOID and BLPU/street identifiers. The mechanism that makes address-to-street-to-building joins possible without premium data.

When you need it

Useful at these project stages, from the working group's stage matrix:

Strategic Definition

Matched on

Ordnance Survey and topographical surveys

Assigned by

Matched to data items the matrix names

Coverage and detail

Geographic

Great Britain (England, Scotland, Wales). NOT Northern Ireland - OSNI is a separate agency.

Nations

England, Scotland, Wales

Resolution

Identifier pair table

Formats

Varies by product: CSV, GML, GeoPackage, Shapefile, vector tiles, raster (GeoTIFF)

Update cadence

OS OpenData refresh roughly quarterly; OS Open UPRN and Open USRN every six weeks

Access and machine route

Licence as stated

Open Government Licence v3.0 with the OS OpenData attribution requirement: 'Contains OS data (c) Crown copyright and database right [year]'

Assertion source

as published by Ordnance Survey

Protocol

OS Downloads API v1 (REST/JSON, lists product versions and direct download URLs); OS Maps API / OS Vector Tile API for tiled access

Endpoint

https://api.os.uk/downloads/v1/products

Harvest note

yes-automated note recorded in the machine_endpoint field: OS Downloads API open products need no key also

Caveats

GB only - Northern Ireland requires OSNI/LPS products via Spatial NI. OS OpenMap Local buildings carry no height or attribute data. Terrain 50 is too coarse for site-level design (use LIDAR).

Classification

Category

Unassigned

Assigned by

Not yet determined

Depth domain

Surface

Data form

Raster, Tabular, Vector

Evidence confidence

Not yet assessed. Only a person can set this.

How current this entry is

Last updated here

2026-09-22

Last checked against the holder

2026-09-07

Checked by a person

Not yet. Nobody has read this entry.

Catalogue id

os-open-linked-identifiers