This page lists known data issues in relation to the OS National Geographic Database (NGD) themes, collections and feature types. The OS NGD is in its infancy and, as such, will be largely developed and iterated upon in its early life.
As and when we resolve a known data issue, we will remove it from this page.
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Very small number of features not being given the correct 'End of Life' change type
There are 319 features (out of 600+ million) which reside within the 'features' collections (i.e. any OS NGD collection which has a name of 'XXX Features', for example, Transport Features) that have not been given the correct 'End of Life' change type. This means that these features still reside within the supply but should be deleted.
Isle of Man addresses
A total of 32 address records are currently present in the OS NGD GB Address Collection which should not be contained within this collection as they are actually Isle of Man records. These records are correctly present in the OS NGD Islands Address Collection.
Incorrect change type for addresses moving between feature types
In a very small number of cases, when an address moves between feature types, such as moving from Pre-Build Address to Built Address, the change type given is incorrect.
The address 'leaving' the Pre-Build Address Feature Type is correctly marked 'Moved To', but when it enters the Built Address Feature Type, it is incorrectly marked as 'New' rather than 'Moved From'.
Your Change-Only Update (COU) processing will still work correctly, and your data holdings will be complete, but the address will have been incorrectly marked as 'New'.
Historic European Region Feature Type
This feature type contains updates made to the boundaries post 01 April 2021 (when the feature type was frozen in the Boundary-Line product). This means that there will be differences between the boundaries accessed via our OS OpenData pages and those accessed via OS NGD.
Three Missing Parishes from 'Parish or Community' Layer
The June release will not display the Margaret March, Tollard Royal and Marlow Bottom Civil Parish (CP) within the Parish or Community layer. This issue is being investigated and we are working to have this fixed for the October release.
Some underground Structure features are
missing from the Habitat Coverage cross
reference table
Three underground Structure features with an OS Land Cover Tier B attribute of ‘Coniferous Trees’, ‘Non-Coniferous Trees’, ‘Scattered Coniferous Trees’ or ‘Scattered Non-Coniferous Trees’ are missing from the corresponding Habitat Coverage Reference cross reference table.
Overlapping Field Boundary
features exist
Approx. 20 000 Field Boundary features are overlapping. This issue is currently being investigated.
Field Boundary data quality
At the time of launch of the Field Boundary Feature Type (March 2024), areas of Great Britain were still to be quality checked and will be improved as part of OS’s continuous quality review programme when updated imagery is available. Most of the known data quality errors are either in Moorland areas or where imagery was captured earlier in the year and vegetated features are ‘leaf-off’. The downloadable file below contains the status of each 10km2 area relating to the quality of the Field Boundary feature classification.
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.
UPDATE: 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. UPDATE: 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. UPDATE: This issue was resolved on 02 July 2023. Any data ordered or provided after this date will include the fixed data.
Invalid geometries in Waterbody Catchment and River Basin District Catchment features
Some catchment polygons appear to have invalid geometries in the form of self-intersections, holes, and gaps. Instances of self-intersection are primarily due to the gridded digital terrain model (DTM) used to generate the catchment data provided by the third-party data from authoritative bodies.
Incorrect representation of a Waterbody Catchment name
The Barlings Eau Upper catchment name is incorrectly displayed. This is as per the third-party data from the authoritative bodies.
Non-unique Waterbody Catchment IDs
Two instances occur where the Waterbody Catchment ID is not unique: GB109056040082 and GB104027063230. This is as per the third-party data from the authoritative bodies.
Certain Waterbody Catchment features do not nest exactly within a River Basin District Catchment.
A total of 14 instances occur where Waterbody Catchments do not nest exactly within their associated River Basin District Catchment. This is as per the third-party data from the authoritative bodies.