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  • OS NGD Documentation
  • INTRODUCTION TO OS NGD
    • Introduction to OS NGD
    • OS NGD Key Benefits to Customers
    • OS NGD Sample Data
    • OS NGD Product Viewer Tool
  • GETTING STARTED
    • Getting Started Information
    • OS NGD Fundamentals
      • Terminology and access
      • File formats and naming
      • Data ordering and currency
      • COU supplies
      • Data schema versioning
      • Unique identifiers
      • Coordinate reference systems
      • Attribute information for feature types
    • Downloading with OS Select+Build
      • Getting Started with GeoPackage
        • ArcGIS Pro
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        • Cadcorp SIS
        • MapInfo Professional
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        • FME
        • GDAL
      • Getting Started with CSV
        • Loading CSV files
        • Processing COUs
      • Getting Started with Attribute Filtering
      • Getting Started with Temporal Filtering
    • Accessing OS NGD APIs
      • Getting started with an API project
      • OS NGD API – Features
        • What data is available?
        • Technical Specification
          • Landing page
          • Conformance
          • Collections
          • Collection
          • Schema
          • Queryables
          • Features
          • Feature
        • Getting Started
          • GIS Software
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          • Libraries
            • Leaflet
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        • Code Examples
      • OS NGD API – Tiles
        • What data is available?
        • Zoom Levels
        • Technical Specification
          • Landing page
          • Conformance
          • Collections
          • Collection
          • Tile Matrix Sets
          • Tiles
          • Styles
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        • Code Examples
    • Styling OS NGD Data
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  • OS NGD NEWS
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    • What's New?
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  • Data and Service Status
    • Data and Service Status Information
  • 🆕Live Service Disruption and Planned Maintenance
  • Current Known Data Issues
  • 🆕Resolved Data Issues
  • USING OS NGD DATA
    • OS NGD Buildings
      • Building Feature Type
      • How Building data is created
      • Building attribution
      • Known limitations
      • Summary
    • OS NGD Structures
      • Field Boundary
        • Field Boundary Feature Type
        • How Field Boundary data is created
        • Field Boundary attribution
        • Known limitations
        • Summary
    • OS NGD Transport
      • Pavements
        • Pavement polygons
        • Pavement attribution
        • Pavement Link feature type
      • Trams
        • Tram attribution on Road Link
        • Tram On Road Feature Type
        • Trams in the Rail Network
      • Street Light
        • Known limitations
    • OS NGD Land Cover Enhancements
      • Introduction
      • Habitat mapping
      • Percentage coverage
      • Cross reference table
      • Known limitations
      • Summary
    • Data Catalogue
  • DATA STRUCTURE
    • OS NGD Address
      • GB Address
        • Built Address
        • Historic Address
        • Non-Addressable Object
        • Pre-Build Address
        • Street Address
      • Islands Address
        • Built Address
        • Historic Address
        • Non-Addressable Object
        • Pre-Build Address
        • Street Address
      • Related Components
        • Alternate Address
        • Postal Address
        • Other Classification
        • Related Entity
      • Versioning information
      • GB Address Local Custodian Codes
      • Islands Address Local Custodian Codes
    • OS NGD Administrative and Statistical Units
      • Boundaries
        • Boundary High Water Mark
        • Ceremonial County
        • Country
        • Devolved Parliament Constituency
        • Devolved Parliament Electoral Region
        • Electoral Division
        • GLA Assembly Constituency
        • Historic County
        • Historic European Region
        • Lower Tier Local Authority
        • Parish Or Community
        • Polling District
        • Region
        • Regional Authority
        • Upper Tier Local Authority
        • Ward
        • Westminster Constituency
    • OS NGD Buildings
      • Building Features
        • Building
        • 🆕Building Access Location
        • Building Line
        • Building Part
    • OS NGD Geographical Names
      • Named Features
        • 🆕Crowd Sourced Name Point
        • Named Area
        • Named Point
        • Named Road Junction
    • OS NGD Land
      • Land Features
        • Land
        • Land Point
        • Landform
        • Landform Line
        • Landform Point
    • OS NGD Land Use
      • Land Use Features
        • Site
        • Site Access Location
        • ❌Site Routing Point
    • OS NGD Structures
      • Structure Features
        • Compound Structure
        • Field Boundary
        • Structure
        • Structure Line
        • Structure Point
    • OS NGD Transport
      • Routing and Asset Management Information (RAMI)
        • Average And Indicative Speed
        • Highway Dedication
        • Maintenance Area
        • Maintenance Line
        • Maintenance Point
        • Reinstatement Area
        • Reinstatement Line
        • Reinstatement Point
        • Restriction
        • Routing Hazard
        • Routing Structure
        • Special Designation Area
        • Special Designation Line
        • Special Designation Point
      • Transport Features
        • Cartographic Rail Detail
        • Rail
        • Road Line
        • Road Track Or Path
        • 🆕Street Light
      • Transport Network
        • Connecting Link
        • Connecting Node
        • Ferry Link
        • Ferry Node
        • Ferry Terminal
        • Path
        • Path Link
        • Path Node
        • Pavement Link
        • Railway Link
        • Railway Link Set
        • Railway Node
        • Road
        • Road Junction
        • Road Link
        • Road Node
        • Street
        • Tram On Road
    • OS NGD Water
      • Water Features
        • Inter Tidal Line
        • River Basin District Catchment
        • Tidal Boundary
        • Water
        • Water Point
        • Waterbody Catchment
      • Water Network
        • Water Link
        • Water Link Set
        • Water Node
  • Code Lists
    • Code Lists Overview
      • accesstypevalue
      • 🆕accesslevelvalue
      • 🆕accessmodevalue
      • 🆕accessobstructionvalue
      • 🆕accesspurposevalue
      • addressbasepostalvalue
      • addressclassificationsourcevalue
      • addressdescriptionvalue
      • addressstatusvalue
      • addressstreettypevalue
      • associatedstreetdatadescriptionvalue
      • averageandindicativespeeddescriptionvalue
      • basementpresencesourcevalue
      • boundaryhighwatermarkdescriptionvalue
      • boundarytypevalue
      • 🆕buildingaccesslocationdescriptionvalue
      • buildingageperiodvalue
      • buildingagesourcevalue
      • buildingconnectivitytypevalue
      • buildingdescriptionvalue
      • buildinglinedescriptionvalue
      • buildingpartdescriptionvalue
      • buildingpartoslandcovertieravalue
      • buildingpartoslandcovertierbvalue
      • buildingusevalue
      • buildstatusvalue
      • builtstructureheightconfidencevalue
      • capturemethodvalue
      • capturespecificationvalue
      • ceremonialcountydescriptionvalue
      • changetypevalue
      • classificationcorrelationvalue
      • compoundstructuredescriptionvalue
      • connectinglinkdescriptionvalue
      • connectingnodedescriptionvalue
      • constructionmaterialsourcevalue
      • constructionmaterialvalue
      • countryvalue
      • countrydescriptionvalue
      • 🆕crowdsourcednamedescriptionvalue
      • 🆕crowdsourcednamematchtypevalue
      • cyclefacilityvalue
      • dataentitycatalogue
      • dedicationvalue
      • devolvedparliamentconstituencydescriptionvalue
      • devolvedparliamentelectoralregiondescriptionvalue
      • electoraldivisiondescriptionvalue
      • extentoflinkvalue
      • ferrylinkdescriptionvalue
      • ferrynodedescriptionvalue
      • ferryterminaldescriptionvalue
      • fieldboundarydescriptionvalue
      • formofroadnodevalue
      • formofwaytypevalue
      • gaugevalue
      • glaassemblyconstituencydescriptionvalue
      • gssrolevalue
      • hazardtypevalue
      • heightingmethodvalue
      • highwaydedicationnetworkfeaturetypevalue
      • historiccountydescriptionvalue
      • historiceuropeanregiondescriptionvalue
      • intertidallinedescriptionvalue
      • 🆕illuminationvalue
      • junctiontypedescriptionvalue
      • landdescriptionvalue
      • landformdescriptionvalue
      • landformlinedescriptionvalue
      • landformpointdescriptionvalue
      • landoslandcovertieravalue
      • landoslandcovertierbvalue
      • landformvalue
      • landpointdescriptionvalue
      • languagevalue
      • linkdirectionvalue
      • 🆕linkreferenceconfidencevalue
      • lowertierlocalauthoritydescriptionvalue
      • maintenancevalue
      • 🆕matchedfeaturetypengdvalue
      • 🆕matchedthemengdvalue
      • matchstatusvalue
      • classificationcorrelationvalue
      • namedareaextentdefinitionvalue
      • nameddatevalue
      • nameddayvalue
      • namedescriptiongroupvalue
      • namedescriptionvalue
      • namedperiodvalue
      • namedroadjunctiondescriptionvalue
      • namedtimevalue
      • networkfeaturetypevalue
      • 🆕networknodefeaturetypevalue
      • networkoverunderbridgevalue
      • operationalstatevalue
      • operationalstatusvalue
      • oslandusetieravalue
      • oslandusetierbvalue
      • parentboundarydescriptionvalue
      • parentfeaturetypevalue
      • parishorcommunitydescriptionvalue
      • pathdescriptionvalue
      • pathnodedescriptionvalue
      • physicallevelvalue
      • 🆕physicalstatevalue
      • physicallevelvalue
      • pollingdistrictdescriptionvalue
      • positionalaccuracyvalue
      • postcodetypevalue
      • presencevalue
      • raildescriptionvalue
      • raildetaildescriptionvalue
      • railoslandcovertieravalue
      • railoslandcovertierbvalue
      • railwaylinkdescriptionvalue
      • railwaylinksetdescriptionvalue
      • railwaynodedescriptionvalue
      • railwayusevalue
      • regionalauthoritydescriptionvalue
      • regiondescriptionvalue
      • reinstatementtypevalue
      • relationshiptypevalue
      • restrictiontypedescriptionvalue
      • restrictionvalue
      • riverbasindistrictcatchmentdescriptionvalue
      • roadclassificationvalue
      • roaddescriptionvalue
      • roadfunctionvalue
      • roadlinedescriptionvalue
      • roadnodedescriptionvalue
      • roadstructurevalue
      • roadtrackorpathdescriptionvalue
      • roadtrackorpathoslandcovertieravalue
      • roadtrackorpathoslandcovertierbvalue
      • roadwidthconfidencelevelvalue
      • 🆕roofconfidenceindicatorvalue
      • 🆕roofmaterialvalue
      • 🆕roofshapevalue
      • pavementdescriptionvalue
      • sideofroadvalue
      • siteaccesslocationdescriptionvalue
      • sitedescriptionvalue
      • siteextentdefinitionvalue
      • siteroutingpointdescriptionvalue
      • sourceofmeasurevalue
      • specialdesignationtypevalue
      • stakeholdervalue
      • statusvalue
      • streetclassificationvalue
      • streetdescriptionvalue
      • streetgeometrysourcevalue
      • 🆕streetlightdescriptionvalue
      • streetstatevalue
      • streetsurfacevalue
      • streettypevalue
      • structuredescriptionvalue
      • structureoslandcovertieravalue
      • structureoslandcovertierbvalue
      • structurelinedescriptionvalue
      • structurepointdescriptionvalue
      • structuretypevalue
      • structurevalue
      • surfacetypevalue
      • themevalue
      • tidalboundarydescriptionvalue
      • trackrepresentationvalue
      • tramdescriptionvalue
      • 🆕transportfeaturetypevalue
      • uppertierlocalauthoritydescriptionvalue
      • usrnmatchindicatorvalue
      • vehiclequalifiervalue
      • warddescriptionvalue
      • waterbodycatchmentdescriptionvalue
      • waterbodycategoryvalue
      • waterdescriptionvalue
      • wateroslandcovertieravalue
      • wateroslandcovertierbvalue
      • waterlinkdescriptionvalue
      • waterlinkflowdirectionvalue
      • waterlinkgeometrysourcevalue
      • waterlinklevelofdetailvalue
      • waterlinkpermanencevalue
      • waterlinkphysicalcontainmentvalue
      • waterlinkprimacyvalue
      • waterlinksetdescriptionvalue
      • waterlinkwatertypevalue
      • watermarkvalue
      • waternodedescriptionvalue
      • waterpointdescriptionvalue
      • watertypevalue
      • westminsterconstituencydescriptionvalue
      • yesnovalue
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On this page
  • Generic OS NGD current known data issues
  • OS NGD Address Theme current known data issues
  • OS NGD Administrative and Statistical Units Theme current known data issues
  • OS NGD Buildings Theme current known data issues
  • OS Geographical Names Theme current known data issues
  • OS NGD Land Theme current known data issues
  • OS NGD Land Use Theme current known data issues
  • OS NGD Structures Theme current known data issues
  • OS NGD Transport Theme current known data issues
  • OS NGD Water Theme current known data issues

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Current Known Data Issues

PreviousLive Service Disruption and Planned MaintenanceNextResolved Data Issues

Last updated 16 days ago

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This page lists known current live data issues in relation to the OS National Geographic Database (NGD) themes, collections and feature types.

As and when we resolve a known data issue, we will move it to the page. To report an issue that's not currently listed on these pages, please use the .

Any live interruptions to the availability of OS NGD API – Features and OS NGD API – Tiles will be documented on the .

Generic OS NGD current known data issues

The generic data issue in the table below impacts multiple OS NGD themes:

Data Issue Name
Data Issue Description

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.

OS NGD Address Theme current known data issues

Data Issue Name
Data Issue Description
Data Issue Identification Date

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'.

This issue impacts address feature types in both data schema versions (i.e. data schema versions 1.0 and 2.0).

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'.

May 2023

OS NGD Administrative and Statistical Units Theme current known data issues

Data Issue Name
Data Issue Description
Data Issue Identification Date

Historic European Region Feature Type

This feature type (data schema version 1.0) 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.

TBC

Three missing parishes from the Parish Or Community Feature Type

The Margaret March, Tollard Royal and Marlow Bottom Civil Parish (CP) within the Parish Or Community Feature Type (data schema version 1.0) are missing from the current (October 2024) release of data.

This issue is currently being investigated and we are working to fix it for a future release.

July 2024

OS NGD Buildings Theme current known data issues

Data Issue Name
Data Issue Description

Incorrect building height values for some multi-storey properties with a single storey annexe

Some residential two-storey properties with a large adjoining single storey are returning as a single storey when created using machine learning (due to incorrect building height values), for example, two-storey houses with attached garages or large rear extensions.

Additional in-scope buildings included in the Number of Floors data

Some notable non-residential and non-office buildings that meet the scope will be included (for example, several cathedrals and arenas).

Some in-scope residential buildings are excluded from the Number of Floors data

Some in-scope residential buildings have no Number of Floors value (for example, new builds, and buildings failing height validation rules).

Some apartment block buildings are excluded from the Number of Floors data

Apartment blocks that have their address geometry situated in the stairwell of the building and have their building geometry segregated due to the Land Use Site Feature Type will not get a Number of Floors value.

Minor confusion between roofs of similar appearance

When capturing roof type data through our aerial capture program, there can be some confusion between buildings with glass roofs or an evacuated tube collector and those with solar panels present. As a result, buildings with glass roofs may be incorrectly attributed with solar panel presence.

This is something we aim to address in future iterations of roof type data for the Buildings Feature Type.

Inconsistent caravan roof shape

Large static caravans will have inconsistent roof shapes due to the shallow-pitched nature of their roofs, making it difficult to ascertain true shape.

OS Geographical Names Theme current known data issues

Data Issue Name
Data Issue Description

Poor linking between Crowd Sourced Name Point features and other OS NGD features

We are actively improving the linking between Crowd Sourced Name Point features and other OS NGD features, so some updates are expected; these updates will be delivered through standard change-only updates (COUs).

OS NGD Land Theme current known data issues

Data Issue Name
Data Issue Description

Nullified Access Purpose attribute for certain Site Access Location features

Some key public sites have refused access to surveyors and so will have their Access Purpose attribute nullified for the Site Access Location feature.

OS NGD Land Use Theme current known data issues

Data Issue Name
Data Issue Description

Uppercase and lowercase variations of two description values in Site Feature Type data schema v1.2

The two affected values are:

  • Education Support Site

  • Public Waste Disposal Site

The OS NGD access services of OS NGD API – Features and OS Select+Build validate against the data schema, meaning both versions of the description values must be retained to facilitate filtering.

The lowercase values (i.e. Education Support site and Public Waste Disposal site) should be used to filter and retrieve historical features (before 25/09/24), while the uppercase values (i.e. Education Support Site and Public Waste Disposal Site) should be used for records after this date.

This issue only affects data schema version 1.2 of Site; data schema v2.0 of Site was launched with the casing standards consistently applied.

OS NGD Structures Theme current known data issues

Data Issue Name
Data Issue Description

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

Approximately 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 (last updated in August 2024) contains the status of each 10km² area relating to the quality of the Field Boundary feature classification.

Temporal differences to data currency for bridge interactions

Bridges in the OS NGD Structure Features Collection are updated daily, whereas networks in the OS NGD Transport Network Collection and the OS NGD Water Network Collection are updated monthly and quarterly, respectively.

Completeness for bridge interactions

On rare occasions where Network Over and Network Under attribution cannot be identified (i.e. disused bridges or viaducts over dry valleys), the attributes will not be populated (i.e. will be ‘null’).

Overlapping of stacked bridges

Where bridges cross one other, it can be difficult to identify the correct networks running over and / or under each bridge.

Mersey Railway Tunnels and Westferry Circus Tunnel missing

The Mersey Railway Tunnels and Westferry Circus Tunnel are not included in the initial release of data schema v2.0 of the Compound Structure Feature Type.

OS NGD Transport Theme current known data issues

Data Issue Name
Data Issue Description
Data Issue Identification Date

Unexpected Highway Dedication Network References to Streets

Where the Highway Dedication Network Reference references a Street feature, the Network Reference ID attribute is populated with an OSID rather than a USRN as expected for Streets. This issue is currently being investigated.

01/03/2024

Street to Road Link and Street to Path Link reference tables refer to non-existent features

4 153 records in the Street to Road Link reference table and 1 055 records in the Street to Path Link reference table refer to Road Links or Path Links which no longer exist. This issue is currently being investigated.

01/03/2024

Small number of referencing errors in the Road and Path Network

1 Road Link and 3 Path Links reference non-existent Road Nodes or Path Nodes, and 2 Path Nodes are unreferenced by any existing Path Link. This issue is currently being investigated.

01/09/2023

Mismatches between Road Link directionality and Average Speed attribution

There are 854 Road Links where the directionality of the Road Link and the attribution describing average speeds are not in sympathy (for example, Road Link is in Both Directions, but average speed attribution is only available for one of the directions). Some instances of this are a result of the Road Network being updated monthly and speed information being updated six-monthly; however, the remaining instances where this does not apply are being investigated.

01/04/2024

Rail Network referencing error

145 Railway Links are not connected to a Railway Node at one or both ends, and 188 Railway Nodes are not coincident with the start or end of the Railway Link that references them. This issue is currently being investigated.

01/03/2025

OS NGD Water Theme current known data issues

Data Issue Name
Data Issue Description
Data Issue Identification Date

Invalid geometries in Waterbody Catchment and River Basin District Catchment features

Some polygons for Waterbody Catchment and River Basin District Catchment features (data schema version 1.0) 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.

28/03/2023

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.

28/03/2023

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.

28/03/2023

Certain Waterbody Catchment features do not nest exactly within a River Basin District Catchment

A total of 14 instances occur where Waterbody Catchment features (data schema version 1.0) do not nest exactly within their associated River Basin District Catchment features (data schema version 1.0). This is as per the third-party data from the authoritative bodies.

28/03/2023

Unexpectedly null Level of Detail values for Water Links

Approximately 993 000 Water Link features (data schema version 1.0) incorrectly have a null Level of Detail attribute value. All Water Links should have this value populated. This issue is currently being investigated.

05/10/2023

Unexpected Water Link names

Approximately 400 Water Link features (data schema version 1.0) are not being named as expected: Name 1 Text / Name 2 Text attribute populated with the name from the longest (by length) named waterway; Name Secondary 1 Text attribute populated with the name of the next longest named waterway, etc. This issue is currently being investigated.

24/07/2023

Unexpectedly null Catchment Name and Catchment ID for Water Links

Approximately 950 000 Water Link features (data schema version 1.0) incorrectly have a null Catchment Name and Catchment ID. Only links which straddle catchment boundaries or sit entirely outside catchments should have null values in these attributes. This issue is currently being investigated.

03/10/2023

Water Link features with an End Node attribute value of 'MissingXRef'

Approximately 2 000 Water Link features (data schema version 1.0) erroneously have an End Node attribute value of 'MissingXRef'. This may cause problems with validation as the value is not a valid OSID. This issue is currently being investigated.

04/04/2023

Two in data schema v1.2 of the contain duplicates with uppercase and lowercase variations. Data schema v1.0 of Site was launched incorrectly with two description values that did not align with OS casing standards, and on 25 September 2024 the data and related code list were updated to fix this issue.

Resolved Data Issues
'Contact us' section of the OS website
Service Availability Dashboard on the OS Data Hub
Site Feature Type
description values
63KB
Field_Boundary_Status_August_2024.xlsx
Snapshot of the outcomes of the quality review process of Field Boundary feature classification (by 10km² area), as of August 2024.
A data snapshot showing the outcomes of the quality review process of Field Boundary feature classification (by 10km2 area), as of August 2024. A map of the United Kingdom filled in with green, yellow,  and blue coloured pixels.