UPRN address matching algorithm

Terms used

This table lists the main terms used in this specification

Term	Description
Subscriber	An organisation (or system that is operating on behalf of an organisation) that is seeking to access data from the Discovery service
Candidate address	The address string submitted by a user or a subscriber system for matching
UPRN	Unique property reference number as supplied by the ordnance survey organisation
Address based premium	The set of databases as provided by the Ordnance survey holding the UPRNs and several addresses for each
Equivalent match	The UPRN is deemed to be equivalent to the property as described by the submitted address
Sibling match	The UPRN is assigned to a property nearby e.g. next door
Sub-property match	The UPRN is assigned to a “higher level property than the submitted address. For example if the submitted address wasflat 1 and the UPRN was assigned to flat then this would be a supra-property match
Sub property match	The UPRN is assigned to a lower levelproperty than the submitted address. For example if the submitted address was flat 1 and the UPRN was assigned to flat 1 a then this would be a sub property match
DPA file	The Post office Delivery point address file
LPI file	The Local Property identifier file