The upcoming August release of G-NAF has implemented changes to the Geocoded National Address File (G-NAF) structure to assist users in tracking address changes.
G-NAF users who track new addressable objects entered into the dataset (such as a property) have found this process challenging, due to the systemised allocation of IDs (ADDRESS_DETAIL_PID) which are unique to each address label rather than each object. This can result in:
- changes to the address label (such as merge criteria) which aren’t representative of changes to the object (i.e. a new label is attached to an existing property)
- the removal of new addresses, if a label is not supplied by contributors (-1 confidence) within a 12 month period.
For example, an address can change from a property lot number to a rural address with allocated street numbers.
Users will now find the identification and tracking of address changes much easier, with the introduction of a new Address Feature table which identifies the specific components changed within an address. Containing both principal and alias addresses, the table features six fields:
The new table has the added feature of retaining retired addresses, in order to provide the full history of instances in which addresses have been retired. There is potential, in future updates, for this table to incorporate address changes to an addressable object (such as a property).