positionalaccuracyvalue

This page details upcoming data that will be provided for the Positional Accuracy Value Code List in the OS NGD from the end of September 2025 to give you early insight. Data schema version 2.0 for this code list is currently not available through the live access services. The information on this page is as accurate as possible, but is subject to change before launch.

This code list is used in association with the Positional Accuracy attribute which is present within multiple feature types in the OS NGD Address Theme. The code list describes the quality of position for an address coordinate in the real world and the conditions under which an address coordinate will be assigned each value.

v2.0

V2.0 of the code list was released on 25 September 2025.

What's new?

The Low Accuracy label is now in title case (it incorrectly appears in sentence case in v1.0 of the code list, i.e. Low accuracy).

The new values has a 'new' emoji (🆕) against it.

Label	Definition
Central Internal Position	The address seed is contained within a Building and within 2.5m of its calculated centre or the seed is in the best possible position based on the nature of the premises, for example, Development Land, House Boat, Wind Farm.
General Internal Position	The address seed is contained with a Building but is more than 2.5m away from its calculated centre or the seed is in an internal position based on the nature of the premises, for example, Development Land, House Boat.
🆕 Low Accuracy	This address seed has been captured to a low level of accuracy and has been marked for priority review to be updated as a priority.
Postcode Unit Position	The address seed has been captured to Postcode Unit level. It will be updated when more information becomes available.
Street Location	The address seed is plotted in accordance with the declared street start or end coordinates. Note this is the highest accuracy possible for Street Records.
Transitional Position	The address seed has been changed from provisional to live in the last six months. It has been captured to a high level of positional accuracy, but the topographic feature is not yet captured. Note the address seed will only be moved pending any imminent mapping updates.

v1.0

V1.0 of the code list was released on 02 November 2022.

Label	Definition
Central Internal Position	The address seed is contained within a Building and within 2.5m of its calculated centre or the seed is in the best possible position based on the nature of the premises, for example, Development Land, House Boat, Wind Farm.
General Internal Position	The address seed is contained with a Building but is more than 2.5m away from its calculated centre or the seed is in an internal position based on the nature of the premises, for example, Development Land, House Boat.
Low accuracy	This address seed has been captured to a low level of accuracy and has been marked for priority review to be updated as a priority.
Postcode Unit Position	The address seed has been captured to Postcode Unit level. It will be updated when more information becomes available.
Street Location	The address seed is plotted in accordance with the declared street start or end coordinates. Note this is the highest accuracy possible for Street Records.
Transitional Position	The address seed has been changed from provisional to live in the last six months. It has been captured to a high level of positional accuracy, but the Topographic feature is not yet captured. Note the address seed will only be moved pending any imminent mapping updates.