Resolved Data Issues
This page lists resolved data issues in relation to the OS NGD themes, collections and feature types.
Generic OS NGD resolved data issues
The generic data issues in the table below impacted multiple OS NGD themes:
Interruption to the supply of Daily Updates for OS NGD Building Part (February 2025) and impact on topological data ‘surface’ of OS NGD 'Feature' Collections
We are currently deploying improvements to the Building Height data available on OS NGD Building Part (data schema v1.0 and v2.0) until 24 February 2025. During this period, daily updates to the Building Part Feature Type, such as changes captured by surveyors, will be temporarily paused. These changes will be reflected in the product data after the completion of the improvements.
Consequently, users may observe anomalies in the consistency of the topological surface when utilising various OS NGD 'Feature' Collections (such as OS NGD Land Features). These anomalies will manifest as holes or overlaps where the Building Part feature has not been updated concurrently with the surrounding features. This impact will also be visible in OS NGD API – Features and OS NGD API – Tiles.
Please note that we advise against using counts from the OS NGD Building Part Feature Type with a temporal filter set between 02 February 2025 and 24 February 2025 as the counts may not be accurate due to the impact on a small number of topographic features.
24/02/2025
The improvements were completed by 24/02/2025 as planned and Daily Updates resumed as normal for impacted feature types.
Please note that we advise against using counts from the OS NGD Building Part Feature Type with a temporal filter set between 02 February 2025 and 24 February 2025 as the counts may not be accurate due to the impact of the improvement work on a small number of topographic features.
OS NGD Address Theme resolved data issues
Incorrect GSS code values for Barnsley and Sheffield
The GSS codes for Sheffield and Barnsley have only been updated in OS NGD Address GB Collection features that have received change-only updates (COUs) since 01/04/2025. Features in Sheffield or Barnsley that have not received COU since this date will display the previous (incorrect) GSS code.
Local Authority District
Previous GSS Code (prior to 01 April 2025)
Current GSS Code
(Effective from 01 April 2025)
Barnsley
E08000016
E08000038
Sheffield
E08000019
E08000039
24/06/2025
We are pleased to inform you that the fix for GSS codes affecting the OS NGD Address GB Collection was made available to customers on Tuesday 24/06/2025.
OS NGD Administrative and Statistical Units Theme resolved data issues
No current resolved data issues to note for this theme.
OS NGD Buildings Theme resolved data issues
No current resolved data issues to note for this theme.
OS NGD Geographical Names Theme resolved data issues
No current resolved data issues to note for this theme.
OS NGD Land Theme resolved data issues
No current resolved data issues to note for this theme.
OS NGD Land Use Theme resolved data issues
No current resolved data issues to note for this theme.
OS NGD Structures Theme resolved data issues
Duplicate features in the OS NGD Structures and OS NGD Land Themes, and duplicate features in OS NGD Structures and OS NGD Building Themes
Following a recent update, not all features which were due to move themes fully migrated from one OS NGD theme to another. There are 3 595 duplicate features in the below themes:
3 584 ‘slipway’ features are in both the OS NGD Structures Theme and the OS NGD Land Theme. These features should only be available in the OS NGD Land theme.
11 ‘Grandstand’ features are in both the OS NGD Structures Theme and the OS NGD Buildings Theme. These features should only be available in the OS NGD Building Part Feature Type.
The duplicated features have the same ID when represented in the more than one Feature Type.
02/09/2025
This issue was resolved on 02 September 2025. Customers who take monthly updates will see this fix in the next update on 01 October 2025.
OS NGD Transport Theme resolved data issues
Duplicate Street Light features
There are around 84 000 Street Light features that are duplicated in Milton Keynes, Bedford and surrounding areas. This means that in this area, each street Light geometry is replicated twice; however, each geometry will still have its own unique OSID.
03/04/2025
This issue was resolved on 03 April 2025. Customers who take monthly updates will see this fix in the next update on 01 May 2025.
Incorrect Street Light coverage values on Road Links
We are aware of an issue that has caused a small number of incorrect values for Street Light coverage attribution on Road Links. Impacted Road Links will have a Presence Of Street Light Coverage attribute value that does not align with the evidence of street light presence in the Street Light Feature Type.
For example, a Road Link that has Street Lights features along it may have a coverage value of 'Fully Unlit' when it does in fact have Street Light features alongside it.
This issue affects approximately 0.45% of Road Links.
03/04/2025
This issue was resolved on 03 April 2025. Customers who take monthly updates will see this fix in the next update on 01 May 2025.
OS NGD Water Theme resolved data issues
No current resolved data issues to note for this theme.
Archived resolved data issues for temporal filtering
Resolved data issues older than six months are included in the tabs below under each OS NGD theme.
Snapshots of OS NGD data retrieved through temporal filtering in OS Select+Build may include issues with the data that were present at the time but have since been resolved. The following tabs contain details of resolved data issues more than six months old, arranged by the OS NGD themes they apply to.
For more information on temporal filtering within OS Select+Build, please see the getting started with temporal filtering page.
3D geometry missing in GeoPackage format for some feature types in the OS NGD Transport Network and Water Network Collections
In the OS NGD Transport Network Collection and OS NGD Water Network Collection, there are multiple feature types that contain 3D geometry. We are aware of an issue where 3D geometry is not being supplied in the GeoPackage format. This issue impacts the following feature types: Connecting Link, Connecting Node, Ferry Link, Ferry Node, Path Link, Path Node, Road Link, Road Node, Water Link and Water Node. Customers taking CSV format will not be affected.
26/11/2024
This issue was resolved on 26 November 2024. To receive updated data:
Customers who have only ordered once: Customers will need to re-order to receive the corrected data.
Monthly Update Customers: 01 December monthly updates with corrected data will be supplied as normal.
Annual Update Customers: 01 January annual updates with corrected data will be supplied as normal.
Topographic features missing from four feature types
From 26 September 2024 to 31 October 2024, an issue affected the following four OS NGD feature types, causing features to be missing from the data:
OS NGD Building Part Feature Type: ~80 000 features are missing from data schema v2.0 compared to data schema v1.0.
OS NGD Land Feature Type: ~38 000 features are missing from data schema v3.0 compared to data schema v2.0.
OS NGD Water and OS NGD Structure Feature Types: ~100 features are missing in total across both feature types from data schema v3.0 compared to data schema v2.0.
For example, where an affected Building feature should be visible, a blank area will instead be seen, creating a ‘gap’:
31/10/2024
This issue was resolved on 31 October 2024. Any data ordered or provided after this date will include the fixed data.
Please note, we advise against using counts from the four aforementioned affected OS NGD feature type datasets when taking historic snapshots of data between 26 September 2024 and 31 October 2024 as the counts may not be accurate due to the missing topographic features.
Site count discrepancies for some Land features
In a small number of instances, the Containing Site Count attribute presents the wrong value in Land features. This error only impacts 0.7% of Land features, and we expect it to be fixed by early October 2024.
12/10/2024
This issue was resolved on 12 October 2024. Any data ordered or provided after this date will include the fixed data.
Duplicate Street Light features
There are around 84 000 Street Light features that are duplicated in Milton Keynes, Bedford and surrounding areas. This means that in this area, each street Light geometry is replicated twice; however, each geometry will still have its own unique OSID.
03/04/2025
This issue was resolved on 03 April 2025. Customers who take monthly updates will see this fix in the next update on 01 May 2025.
Incorrect Street Light coverage values on Road Links
We are aware of an issue that has caused a small number of incorrect values for Street Light coverage attribution on Road Links. Impacted Road Links will have a Presence Of Street Light Coverage attribute value that does not align with the evidence of street light presence in the Street Light Feature Type.
For example, a Road Link that has Street Lights features along it may have a coverage value of 'Fully Unlit' when it does in fact have Street Light features alongside it.
This issue affects approximately 0.45% of Road Links.
03/04/2025
This issue was resolved on 03 April 2025. Customers who take monthly updates will see this fix in the next update on 01 May 2025.
Incorrect speed values
Speed data is supplied quarterly from our third-party supplier. We have identified an issue in which OS have not correctly processed this data. This has resulted in possible incorrect values in the Average and Indicative Speed Feature Type.
25/07/2024
This issue was resolved on 25 July 2024. Any data ordered or provided after this date will include the fixed data.
Welsh speed limit changes
On 17 September 2023, default 20 mph speed limits were introduced across Wales. We are aware that these changes are not yet reflected in the Average and Indicative Speed Feature Type. Speed limit data is supplied by our third-party supplier quarterly. The most recent supply occurred before the Welsh speed limit changes took place and therefore will not be reflected in the OS NGD until the next supply. We expect the updated Welsh speed limits to be in NGD from December 2023.
13/12/2023
This issue was resolved on 13 December 2023. Any data ordered or provided after this date will include updated Welsh speed limit data.
Incorrect speed values
In the Average and Indicative Speed Feature Type, the indicative speed value for individual Road Links can be inferred by Ordnance Survey. We are aware that in certain instances some of these indicative speed values are incorrect. We are working to resolve this issue and have an approximate implementation date of the start of July 2023. This issue impacts just over 2% (174 000) of the total Road Links in the Average and Indicative Speed Feature Type.
02/07/2023
This issue was resolved on 02 July 2023. Any data ordered or provided after this date will include the fixed data.
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