Resolved Data Issues
This page lists resolved data issues in relation to the OS National Geographic Database (NGD) themes, collections and feature types.
Please see the Current Known Data Issues page for details about current live data issues issues.
Any live interruptions to the availability of OS NGD API – Features and OS NGD API – Tiles will be documented on the Service Availability Dashboard on the OS Data Hub.
The OS NGD is in its infancy and, as such, will be largely developed and iterated upon in its early life.
Generic OS NGD resolved data issues
The generic data issues in the table below impacted multiple OS NGD themes:
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.
OS NGD Address Theme resolved data issues
UPRNs incorrectly in both Pre-Build Address and Built Address Feature Type tables
Four UPRNs (Unique Property Reference Numbers) incorrectly appear in both feature types: 10096454138, 10096454142, 10096759815, 10096759820.
This issue is being prioritised and an update will be provided as soon as the issue has been fixed.
19/03/25
The issue has now been resolved and the UPRNs only appear in one feature type.
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
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.
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
No current resolved data issues to note for this theme.
OS NGD Transport Theme resolved data issues
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.
OS NGD Water Theme resolved data issues
No current resolved data issues to note for this theme.
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