Technical specification
This technical specification explains the content of the OS Linked Identifiers API and the methods you can use to call it.
The OS Linked Identifiers API is a free OpenData product that allows you to access the valuable relationships between properties, streets and OS MasterMap identifiers.
If you are not familiar with the OS Linked Identifiers API please read the overview documentation before proceeding.
Core concepts
This specification does not cover core concepts that apply to all Ordnance Survey APIs.
Please read the following pages to learn more about OS API core concepts:
API reference
OS Linked Identifiers API has four main endpoints:
Identifiers
Identifier Types
Feature Types
Product Version Information
Correlation method table
The table below lists all of the correlation methods:
Correlation method | Feature relationship |
---|---|
| RoadLink ↔ TopographicArea |
| Road ↔ TopographicArea |
| Street ↔ TopographicArea |
| BLPU ↔ TopographicArea |
| RoadLink ↔ Road |
| RoadLink ↔ Street |
| BLPU ↔ RoadLink |
| Road ↔ Street |
| BLPU ↔ Street |
| Open Roads RoadLink ↔ OSMM Highways RoadLink |
| Open Roads RoadNode ↔ OSMM Highways RoadLink |
Please see the following documents for more information about how each of these identifiers has been linked to each other:
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