Product details

Feature types

Feature Type

Identifier Type

Source Product

Description

TopographicArea

TOID

OS MasterMap Topographic Layer

Polygon limited to either a building outline or road surface area.

RoadLink

TOID

OS MasterMap Highways

Section of road from junction to junction.

Road

TOID

OS MasterMap Highways

Collection of RoadLink with a given name.

BLPU

(Building Land Parcel Unit)

UPRN

(Unique Property Reference Number)

AddressBase Premium

An address location with postal address.

Street

USRN

(Unique Street Reference Number)

OS MasterMap Highways

An identifier allocated to a street by a local authority.

ORRoadLink/ ORRoadNode

GUID

Open Roads

Road sections and junctions from our open data product. These features are referred to in OS Open Roads as RoadLink and RoadNode. In this product they are referred to as ORRoadLink and ORRoadNode respectively to distinguish them from the OS MasterMap Highways Networks RoadLink and RoadNode features.

Please refer to the source product documentation for details of each feature that is being related.

Identifier Schemes

Each feature uses a specific identifier scheme for its identifier. These are as follows:

Unique Property Reference Number (UPRN)

A UPRN is a unique numeric identifier for every address in Great Britain. The identifier is critical and can be found throughout OS's AddressBase products. It provides a complete and consistent

identifier throughout a property’s life cycle. This means the UPRN is assigned to an address at the earliest opportunity and is never reused, even after the property has been demolished.

Unique Street Reference Number (USRN)

A USRN is a unique and persistent identifier for every street, road, track, path, cycletrack or way in Great Britain and can be found in OS’s Highways Network products and is also a key component in OS’s AddressBase suite of products.

Topographic Identifier (TOID)

A TOID is a unique identifier, consisting of the letters ‘osgb’ and followed by either thirteen or sixteen digits, associated with every feature in many of Ordnance Survey’s large-scale products. No amends can be made to this code as it may no longer be functional with other OS MasterMap products.

The TOID is based on the Digital National Framework concept and the principles that underpinned it.

These identifiers contain no attribution or information, for example coordinate position. If you need this to visualise your data, we offer a family of Open Identifier products for you to download and freely use under Open Government Licence.

Relationship Source

The following table lists each of the relationships provided and the premium product the relationship has been extracted from.

Correlation Method ID

Source Product for relationship

RoadLink_TOID_TopographicArea_TOID_2