This document aims to provide all the information to evaluate if the method of associating the respective identifiers is suitable for your needs. These identifier relationships have been extracted from existing premium products and are presented in a standalone table for easy and open access to the information. It describes which product the information was extracted from, what information was extracted and how the source product derived the original association between the identifiers.
This relationship is between the Topographic Identifier (TOID) of the RoadLink features and the Unique Street Reference Number (USRN) of Street features in OS MasterMap Highways Network.
A USRN is an 8-digit unique and persistent identifier for a street assigned by a Roads Authority or Highway Authority. Where possible, the geometry of Streets provided by the Roads or Highway Authorities is spatially matched to the geometry of OS RoadLink(s) and an aggregated geometry of the RoadLink(s) will be provided in the OS MasterMap Highways Network.
This relationship is extracted using the reference to the RoadLink(s) which have been matched to the Street
feature in the ‘link’ attribute within the OS MasterMap Highways Network – Roads product following its
release. This means that this relationship will not include all USRNs in OS MasterMap Highways, as Street features that have not been matched to an OS RoadLink will be omitted.
The relationship is determined by the link reference within OS MasterMap Highways Network, demonstrating the RoadLink feature(s) of which the matched Street features are composed. Where possible, the geometry of Streets provided by the Roads or Highway Authorities is spatially matched to the geometry of OS RoadLink(s) and an aggregated geometry of the RoadLink(s) will be provided in the OS MasterMap Highways Network.
As this relationship is determined using a single source product, the version information provided will always be the same as the version of the feature used to create the correlation.
A Confidence Value is assigned to indicate the reliability of the version information provided in this product in relation to the version of the features used to form the correlation in the original product. The Confidence Value is given for each relationship, which will always be defined in this relationship as:
| Confidence Value | Definition |
|---|---|
Version information is correct
The version information provided is the same as the version of the feature used to create the correlation.