This page 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.
The relationship between the Unique Property Reference Number (UPRN) and the Topographic Identifier (TOID) of OS MasterMap Highways Network - Roads is extracted for all live, provisional and historic BLPU records in AddressBase Premium. Data from the OS MasterMap Highways Network - Roads and AddressBase Premium BLPU table are joined where the TOID equals the CROSS_REFERENCE of the AddressBase Premium Cross-Reference table and the source is equal to ‘7666MI’.
The relationship is extracted from AddressBase Premium after the release of each six weekly Epoch. Further information on the relationship extraction, including the date of extraction and product version information, are provided in the Product Version Information File.
The relationship is determined by finding the closest RoadLink TOID from OS MasterMap Highways Network – Roads, to every BLPU of AddressBase Premium that references a USRN. The relationship is performed by GeoPlace, a joint venture between Ordnance Survey and Local Government Association (LGA) who produce AddressBase.
AddressBase Premium is updated every six weeks and OS MasterMap Highways – Roads is updated every four weeks. Therefore, some of the version information in the product may have changed and mean that the relationship is out of sync. To provide an indication of the reliability of the version information provided in this product in relation to that of the version of the features used to form the correlation in the original product, a Confidence Value is given for each relationship, which is defined as follows:
| 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.
Version information has potentially changed
The version information could be different from the version of the feature that was used to create the correlation.
Version information has changed
The version information provided is different from the version of the feature used to create the correlation.