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  • OS Download Products' Documentation
  • Addressing and Location
    • Addressing and Location Portfolio Information
    • AddressBase Fundamentals
      • Release Notes
        • AddressBase Products May 2025 – Epoch 118
        • AddressBase Islands May 2025 – Epoch 118
        • AddressBase Products March 2025 – Epoch 117
        • AddressBase Islands March 2025 – Epoch 117
        • AddressBase Products February 2025 – Epoch 116
        • AddressBase Islands February 2025 – Epoch 116
        • AddressBase Products December 2024 – Epoch 115
        • AddressBase Islands December 2024 – Epoch 115
        • AddressBase Products November 2024 – Epoch 114
        • AddressBase Islands November 2024 – Epoch 114
        • AddressBase Products September 2024 – Epoch 113
        • AddressBase Islands September 2024 – Epoch 113
        • AddressBase Products August 2024 – Epoch 112
        • AddressBase Islands August 2024 – Epoch 112
        • AddressBase Products June 2024 – Epoch 111
        • AddressBase Islands June 2024 – Epoch 111
        • AddressBase Products May 2024 – Epoch 110
        • AddressBase Islands May 2024 – Epoch 110
        • AddressBase Products April 2024 – Epoch 109
        • AddressBase Islands April 2024 – Epoch 109
      • AddressBase product family
      • Future and past publication dates
      • Unique Property Reference Number (UPRN)
      • Coordinate reference systems
      • Classification scheme
      • Data sources
      • Street names and numbering
      • Currency, completeness and precision
      • Product supply
      • Code lists and enumerations
        • AddressbasePostalCode
        • BLPUStateCode
        • ChangeTypeCode
        • CountryCode
        • Date
        • FileTypeCode
        • LanguageCode
        • LogicalStatusCode
        • OfficialFlagCode
        • PostcodeTypeCode
        • RPCCode
        • StateCode
        • StreetClassificationCode
        • StreetRecordTypeCode
        • StreetStateCode
        • StreetSurfaceCode
        • Time
        • USRNMatchIndicatorCode
      • AddressBase local custodian codes
      • AddressBase Islands local custodian codes
    • AddressBase
      • Release Notes
      • AddressBase Getting Started Guide
        • Prerequisites
        • Data supply
        • Working with CSV data
        • Working with GML data
        • Working with COU data
        • Creating a single-line or multi-line address
        • Searching for addresses
      • AddressBase Technical Specification
        • Data formats
        • Supply and update
        • AddressBase structure
        • Feature types
          • Address
          • AddressBase Supply Set
        • Code list and enumerations
        • CSV to GML mapping
        • Example records
          • CSV
          • GML
      • AddressBase Downloads
      • AddressBase Known Data Issues
    • AddressBase Core
      • Release Notes
        • 20 May 2025
        • 13 May 2025
        • 07 May 2025
        • 29 April 2025
        • 23 April 2025
        • 15 April 2025
        • 08 April 2025
        • 01 April 2025
        • 25 March 2025
        • 18 March 2025
      • AddressBase Core Overview
        • Data capture and sources
        • GeoPlace
        • Unique Property Reference Number (UPRN)
        • Coordinate reference systems
        • Classification
        • Currency, completeness and precision
        • Product supply
      • AddressBase Core Getting Started Guide
        • Downloading a dataset
        • Working with CSV data
        • Working with GPKG data
        • Working with COU data
        • Working with tiled data
      • AddressBase Core Technical Specification
        • Data formats
        • Supply and update
        • Attributes
        • Enumerations
        • Example records
      • AddressBase Core Downloads
      • AddressBase Core Known Data Issues
    • AddressBase Plus
      • Release Notes
      • AddressBase Plus Getting Started Guide
      • AddressBase Plus Technical Specification
        • Data formats
        • Supply and update
        • AddressBase Plus structure
        • Feature types
          • Address
          • AddressBase Supply Set
        • Code lists and enumerations
        • CSV to GML mapping
        • Example records
          • CSV
          • GML
      • AddressBase Plus Downloads
      • AddressBase Plus Known Data Issues
    • AddressBase Plus Islands
      • Release Notes
      • AddressBase Plus Islands Getting Started Guide
      • AddressBase Plus Islands Technical Specification
        • Data formats
        • Supply and update
        • AddressBase Plus Islands structure
        • Feature types
          • Address
          • AddressBase Supply Set
        • Code lists and enumerations
        • CSV to GML mapping
        • Example records
          • CSV
          • GML
      • AddressBase Plus Islands Downloads
      • AddressBase Plus Islands Known Data Issues
    • AddressBase Premium
      • Release Notes
      • AddressBase Premium Getting Started Guide
        • Prerequisites
        • Data supply
        • Working with CSV data
        • Working with GPKG data
        • Working with GML data
        • Working with COU data
        • Creating a single-line or multi-line address
        • Searching for addresses
      • AddressBase Premium Technical Specification
        • Data formats
        • Supply and update
        • AddressBase Premium structure
        • Feature types
          • Street – (Type 11 Record)
          • BLPU – (Type 21 Record)
          • AddressBase supply set
          • Feature with lifecycle
        • Structured data types
          • Street Descriptor – (Type 15 Record)
          • Application Cross Reference – (Type 23 Record)
          • LPI – (Type 24 Record)
          • Delivery Point Address – (Type 28 Record)
          • Successor Cross Reference – (Type 30 Record)
          • Organisation – (Type 31 Record)
          • Classification – (Type 32 Record)
          • Entity with lifecycle
        • Dataset metadata
          • Metadata – (Type 29 Record)
          • Header – (Type 10 Record)
          • Trailer – (Type 99 record)
        • Code lists and enumerations
        • Attribute format comparison
        • Example records
          • CSV
          • GML
      • AddressBase Premium Downloads
      • AddressBase Premium Known Data Issues
    • AddressBase Premium Islands
      • Release Notes
      • AddressBase Premium Islands Getting Started Guide
      • AddressBase Premium Islands Technical Specification
        • Release Notes
          • June 2024
        • Data formats
        • Supply and update
        • AddressBase Premium Islands structure
        • Feature types
          • Street – (Type 11 Record)
          • BLPU – (Type 21 Record)
          • AddressBase supply set
          • Feature with lifecycle
        • Structured data types
          • Street Descriptor – (Type 15 Record)
          • Application Cross Reference – (Type 23 Record)
          • LPI – (Type 24 Record)
          • Delivery Point Address – (Type 28 Record)
          • Successor Cross Reference – (Type 30 Record)
          • Organisation – (Type 31 Record)
          • Classification – (Type 32 Record)
          • Entity with lifecycle
        • Dataset metadata
          • Header – (Type 10 Record)
          • Metadata – (Type 29 Record)
          • Trailer – (Type 99 record)
        • Code lists and enumerations
        • Attribute format comparison
        • Example records
          • CSV
          • GML
      • AddressBase Premium Islands Downloads
      • AddressBase Premium Islands Known Data Issues
    • Boundary-Line
      • Release Notes
        • May 2025
        • October 2024
        • June 2024
      • Boundary-Line Overview
        • Data overview
        • Product supply
      • Boundary-Line Product Information
        • Relationships of administrative areas
        • Structure of Boundary-Line
        • Boundary-Line principles and features
        • Case studies
        • Metadata
        • Glossary
        • Exception areas
        • The coastline and associated items
      • Boundary-Line Technical Specification
        • Shapefile, TAB and GKPG
          • Features - Shapefile, TAB and GPKG
            • Area - GB
            • Area - English region
            • Area - Wales region
            • Link feature type
            • Area - Polling districts England
            • Historical and ceremonial boundaries features
          • Layers - Shapefile, TAB and GKPG
            • Shapefile
            • TAB
            • GKPG
          • Code lists - Shapefile, TAB and GKPG
            • AreaCode
            • TypeCode
        • GML
          • Features - GML
            • AdministrativeUnit
          • Code lists - GML
            • AdministrativeHierarchyValue
            • NationalClassificationValue
          • Example record - GML
        • Vector tiles
      • Guide to Ceremonial County Boundaries
      • Additional Product Details
      • Boundary-Line Downloads
      • Boundary-Line Known Data Issues
    • Code-Point
      • Code-Point Overview
        • Product details
        • Product supply
      • Code-Point Products Comparison
      • Code-Point Getting Started Guide
        • Product supply
        • Data structure
        • CSV file processing
        • Data measures
        • Metadata
        • Glossary
      • Code-Point Technical Specification
        • Product structure
        • Supply formats
      • Code-Point Downloads
      • Code-Point Known Data Issues
    • Code-Point Open
      • Code-Point Open Overview
        • Product details
        • Product supply
      • Code-Point Open Products Comparison
      • Code-Point Open Getting Started Guide
        • Requirements for using the data
        • CSV file processing
        • Data measures
        • Loading the data into a GIS
        • Glossary
      • Code-Point Open Technical Specification
        • Product structure
        • Supply formats overview
      • Code-Point Open Downloads
      • Code-Point Open Known Data Issues
    • Code-Point with Polygons
      • Release Notes
        • January 2025
      • Code-Point with Polygons Overview
        • Product details
        • Product supply
      • Code-Point with Polygons Products Comparison
      • Code-Point with Polygons Getting Started Guide
        • Using the vertical street lookup
        • Creating single-space postcodes
        • Data measures
      • Code-Point with Polygons Technical Specification
        • Data supply
        • Specification
      • Code-Point with Polygons Downloads
      • Code-Point with Polygons Known Data Issues
    • 🆕OS Emergency Services Gazetteer
      • 🆕OS ESG Overview
        • 🆕Product supply
        • 🆕Planned enhancements
      • OS ESG Getting Started Guide
      • OS ESG Technical Specification
        • Feature type
          • BLPU (Type 21 Record)
        • Structured data types
          • LPI (Type 24 Record)
          • Classification (Type 32 Record)
        • 🆕Code lists
          • AddressbasePostalCode
          • BLPUStateCode
          • ChangeTypeCode
          • 🆕ClassificationCode
          • CountryCode
          • FileTypeCode
          • LanguageCode
          • LogicalStatusCode
          • OfficialFlagCode
          • RPCCode
          • USRNMatchIndicatorCode
        • Dataset metadata
          • Header (Type 10 Record)
          • Metadata (Type 29 Record)
          • Trailer (Type 99 Record)
      • 🆕OS ESG FAQs
      • 🆕OS ESG Downloads
      • OS ESG Known Data Issues
    • OS Open Built Up Areas
      • Release notes
        • April 2024
      • OS Open Built Up Areas Overview
        • Product details
        • Product supply
      • OS Open Built Up Areas Technical Specification
        • Feature types
          • Built Up Areas
          • Built Up Extents
          • Non Built Up Extents
        • Structured data types
          • MultiSurfaceWithAreaType
          • NameType
        • Code list
          • LanguageValue
        • Supply formats
      • OS Open Built Up Areas Known Data Issues
    • OS Open Names
      • Release Notes
        • April 2025
        • January 2025
        • October 2024
        • July 2024
      • OS Open Names Overview
        • Product applications
        • Product details
        • Product supply
      • OS Open Names Getting Started Guide
        • Obtaining OS Open Names data
        • CSV file processing
        • Loading the data in a GIS
      • OS Open Names Technical Specification
        • Source of OS Open Names
        • Viewing resolution
        • Product structure
        • Feature type
          • NamedPlace
        • Code lists
          • LanguageValue
          • NamedPlaceTypeValue
          • LocalTypeValue
        • Structured data types
          • GeographicalName
          • Identifier
        • Local Type
        • Supply formats overview
        • Attribute naming format comparison
        • LocalType code list
      • OS Open Names Downloads
      • OS Open Names Known Data Issues
    • Points of Interest
      • Release Notes
        • March 2025
        • December 2024
        • September 2024
        • June 2024
      • Points of Interest Product Information
        • Using Points of Interest
        • Data measures and data sources
        • Classification scheme
        • Points of Interest Provenance
        • Glossary
        • Points of Interest symbology
      • Points of Interest Technical Specification
        • Using Points of Interest
        • Pipe delimited text (PDT) file format
          • Record structure
        • Code lists
          • Positional Accuracy
          • Match Indicator
        • Example records
        • Glossary
      • Points of Interest Classification Scheme
        • Accommodation, eating and drinking
        • Commercial services
        • Attractions
        • Sport and entertainment
        • Education and health
        • Public infrastructure
        • Manufacturing and production
        • Retail
        • Transport
      • Points of Interest Class Count
        • Accommodation, eating and drinking
        • Commercial services
        • Attractions
        • Sport and entertainment
        • Education and health
        • Public infrastructure
        • Manufacturing and production
        • Retail
        • Transport
      • Points of Interest Downloads
      • Points of Interest Known Data Issues
  • Contextual or derived mapping
    • Contextual or Derived Mapping Portfolio Information
    • Colour Raster Map Fundamentals
      • Colour Raster Map Overview
        • Metadata
        • Data compression
        • Data measures
        • Product supply
      • Colour Raster Map Technical Specification
        • Georeferencing
        • Image file directory (TIFF)
        • Abbreviations used on OS 1:25 000 and 1:50 000 scale mapping
        • Product glossary
    • 1:25 000 Scale Colour Raster
      • 1:25 000 Scale Colour Raster Overview
        • Product details
        • Features depicted in the product
        • Georeferencing
      • 1:25 000 Scale Colour Raster Technical Specification
      • 1:25 000 Scale Colour Raster Downloads
      • 1:25 000 Scale Colour Raster Known Data Issues
    • 1:50 000 Scale Colour Raster
      • 1:50 000 Scale Colour Raster Overview
        • Product details
        • Features depicted in the product
        • Georeferencing
      • 1:50 000 Scale Colour Raster Technical Specification
      • 1:50 000 Scale Colour Raster Downloads
      • 1:50 000 Scale Colour Raster Known Data Issues
    • 1:250 000 Scale Colour Raster
      • 1:250 000 Scale Colour Raster Overview
        • Product details
        • Georeferencing
        • Gazetteer
      • 1:250 000 Scale Colour Raster Technical Specification
      • 1:250 000 Scale Colour Raster Downloads
      • 1:250 000 Scale Colour Raster Known Data Issues
    • GB Overview Maps
      • GB Overview Maps Downloads
      • GB Overview Maps Known Data Issues
    • MiniScale
      • MiniScale Product Guide
        • Supply and formats
        • Georeferencing
        • Depiction of roads and towns
        • Data compression
        • Features, layers and styles
      • MiniScale Technical Specification
        • National Grid
        • MiniScale file management
      • MiniScale Downloads
      • Miniscale Known Data Issues
    • OS Open Zoomstack
      • OS Open Zoomstack Getting Started Guide
        • Zoomstack vector tiles
        • Zoomstack GeoPackage format
      • OS Open Zoomstack Technical Specification
        • List of Layers
        • Description of the cartographic styles
        • Sea Extent and Name Languages
        • Vector Tiles Schema
        • GeoPackage Schema
      • OS Open Zoomstack Known Data Issues
    • OS OpenMap – Local
      • Release Notes
        • April 2025
      • OS OpenMap – Local Overview
        • Product applications and uses
        • Product details
        • Product supply
      • OS OpenMap – Local Getting Started Guide
        • Loading raster data
        • Loading vector data
        • Loading and displaying GML Data
        • POSTGIS
        • Loading and displaying Shapefile supply
        • Viewing the data in QGIS
        • Using shapefiles in PostGIS
        • Using MapInfo Professional
      • OS OpenMap – Local Technical Specification
        • Data structure
        • Feature types
          • Building
          • ElectricityTransmissionLine
          • Glasshouse
          • RailwayStation
          • RailwayTrack
          • RailwayTunnel
          • Road
          • RoadTunnel
          • Roundabout
          • MotorwayJunction
          • CarChargingPoint
          • Foreshore
          • SurfaceWater_Area
          • SurfaceWater_Line
          • TidalBoundary
          • TidalWater
          • Woodland
          • FunctionalSite
          • ImportantBuilding
          • NamedPlace
        • Code lists
          • RailwayStationClassification
          • RailwayTrackClassification
          • DrawLevelValue
          • OverrideValue
          • RoadClassification
          • RoundaboutClassification
          • CarChargingType
          • RatedVoltage
          • ChargeMethod
          • TidalBoundaryClassification
          • BuildingTheme
          • BuildingClassification
          • SiteClassification
          • FontHeightClassification
          • NamedPlaceClassification
      • OS OpenMap – Local Downloads
      • OS OpenMap – Local Known Data Issues
    • OS VectorMap District
      • OS VectorMap District Overview
        • Generalisation
        • Feature types
        • Style definition
        • Product supply
      • OS VectorMap District Technical Specification
        • GML Overview
        • Raster Specification
        • Georeferencing
        • Feature types
          • Building
          • ElectricityTransmissionLine
          • Glasshouse
          • RailwayStation
          • RailwayTrack
          • RailwayTunnel
          • MotorwayJunction
          • Road
          • RoadTunnel
          • Roundabout
          • Foreshore
          • SurfaceWater_Area
          • SurfaceWater_Line
          • TidalBoundary
          • TidalWater
          • Ornament
          • Woodland
          • FunctionalSite
          • NamedPlace
          • SpotHeight
          • AdministrativeBoundary
        • Code lists
          • RailwayStationClassification
          • RailwayTrackClassification
          • RoadClassification
          • RoundaboutClassification
          • DrawLevelValue
          • OverrideValue
          • TidalBoundaryClassification
          • FunctionalSiteClassification
          • NamedPlaceClassification
          • FontHeightClassification
          • AdministrativeBoundaryClassification
        • Attributes
        • Feature Codes
        • Styling of Land and Sea
      • Vector Simple Guide
        • Downloading OS OpenData
        • Opening OS OpenData in QGIS
        • Styling vector data
        • Opening and saving maps in Composer
      • Raster Simple Guide
        • Downloading OS OpenData
        • Opening OS OpenData in QGIS
        • Opening and saving a map in composer
      • OS VectorMap District Downloads
      • OS VectorMap District Known Data Issues
    • OS VectorMap Local
      • Release Notes
        • January 2025
      • OS VectorMap Local Overview
        • Product details
        • Features represented in the product
        • Product style definition
        • Product supply
        • National Grid coverage for OS VectorMap Local
      • OS VectorMap Local Technical Specification
        • GeoPackage overview
        • GML overview
        • Raster data
        • Feature types
          • Area
          • Line
          • VectorMapPoint
          • RoadCLine
          • RailCLine
          • Text
        • Code lists
          • DrawLevelValue
          • AnchorPositionValue
          • TextFontValue
        • Structured data types
          • textRenderingType
        • Feature codes and descriptions
        • Vector tiles overview
        • Important Buildings classification
      • OS VectorMap Local Downloads
      • Supporting documents
        • OS VectorMap Local Cartographic Style Definitions
      • OS VectorMap Local Known Data Issues
  • Networks
    • Networks Portfolio Information
    • OS Detailed Path Network
      • OS Detailed Path Network Overview
        • Product details
        • Attribution
        • Product supply
        • Coordinate reference system
      • OS Detailed Path Network Getting Started Guide
        • Downloading the data
        • Loading GML data
      • OS Detailed Path Network Technical Specification
        • OS Detailed Path Network structure
        • Feature types
          • Route
          • RouteLink
          • RouteNode
        • Structured data types
          • VerticalGainType
        • Code lists
          • LevelCodeValue
          • PotentialHazardValue
          • RightOfWayValue
          • RouteDescriptiveGroupValue
          • RouteDescriptiveTermValue
          • RouteLinkDescriptiveTermValue
          • RouteNodeDescriptiveTermValue
          • SurfaceTypeValue
        • Data quality
        • GML overview
        • GeoPackage overview
          • Route
          • RouteLink
          • RouteNode
        • Vector Tiles overview
          • Route
          • RouteLink
        • GML examples
      • OS Detailed Path Network Downloads
      • OS Detailed Path Network Known Data Issues
    • OS MasterMap Highways Network Fundamentals
      • Release Notes
        • May 2025
        • April 2025
        • March 2025
        • February 2025
        • January 2025
        • December 2024
        • November 2024
        • October 2024
        • September 2024
        • August 2024
        • July 2024
        • June 2024
      • OS MasterMap Highways Network Product Family
      • OS MasterMap Highways Network Overview
        • Standards
        • Coordinate reference system
        • Feature types
          • Road Link (present in Roads & RAMI products)
          • Road Node (present in Roads & RAMI products)
          • Path Link (present in Paths product)
          • Path Node (present in Paths product)
          • Connecting Link (present in Paths product)
          • Connecting Node (Present in Paths product)
          • Road (present in Roads & RAMI products)
          • Path (present in Paths product)
          • Street (present in all OS MasterMap Highways Network products)
          • Road Junction (present in Roads & RAMI products)
          • Ferry Link (present in all OS MasterMap Highways Network products)
          • Ferry Node (present in all OS MasterMap Highways Network products)
          • Ferry Terminal (present in all OS MasterMap Highways Network products)
          • Access Restrictions (present in RAMI product)
          • Turn Restrictions (present in RAMI product)
          • Restrictions For Vehicles (present in RAMI product)
          • Hazards (present in RAMI product)
          • Structures (present in RAMI product)
          • Maintenance (present in RAMI & Paths products)
          • Reinstatement (present in RAMI & Paths products)
          • Highways Dedication (present in RAMI & Paths products)
          • Special Designations (present in RAMI & Paths products)
        • Product supply
        • Product packaging
        • File naming
        • Feature validation data set
        • Volume feature count
        • OS Open Roads Lookup Table
      • OS MasterMap Highways Network Getting Started Guide
        • What do I need to use this data?
        • Product supply
        • Coverage
        • Product packaging
        • File naming
        • Unzipping GML, GeoPackage, and vector tiles files
        • Loading OS MasterMap Highways Network products into a GIS
        • Relationships between Highways tables
      • OS MasterMap Highways Network Playbook
        • Connecting to Address Data
        • Identifying Change in the Network
        • Highlighting Roads Under Construction
        • Creating a Map of Winter Gritting Routes
        • Adding Road Names and Numbers to a Map
        • Merging Tables and Dropping Geometry
        • Creating a Routable Network
      • OS MasterMap Highways Network Downloads
      • OS MasterMap Highways Network Known Data Issues
    • OS MasterMap Highways Network – Roads
      • OS MasterMap Highways Network Overview
      • OS MasterMap Highways Network – Roads Technical Specification
        • Specification changes
        • Structure
        • How the product fits together
        • Change-Only Update (COU) supply
        • Feature types
          • RoadLink
          • RoadNode
          • Road
          • Street
          • RoadJunction
          • FerryLink
          • FerryNode
          • FerryTerminal
        • Structured data types
          • identifier
          • OperationalStateType
          • DesignatedNameType
          • ResponsibleAuthority
          • CycleFacilityType
          • ElevationGainType
          • RoadWidthType
        • Code lists and Enumerations
          • ChangeValue
          • RoadClassificationValue
          • RoadFunctionValue
          • MatchStatusValue
          • OperationalStateValue
          • ProvenanceSourceValue
          • RoadStructureValue
          • LinkDirectionValue
          • FormOfWayValue
          • CycleFacilityValue
          • RoadWidthConfidenceLevelValue
          • FormOfRoadNodeValue
          • RoadNodeClassificationValue
          • AccessPointValue
          • StreetTypeValue
          • JunctionTypeValue
          • ConnectionTypeValue
          • FormOfWaterwayNodeValue
        • GML overview
        • GeoPackage overview
          • ferry_link
          • ferry_node
          • ferry_terminal
          • road
          • road_junction
          • road_link
          • road_node
          • street
        • Vector tiles overview
          • ferry_link
          • ferry_node
          • ferry_node
          • road_link
          • road_node
          • street
        • GML examples
      • OS MasterMap Highways Network Getting Started Guide
      • OS MasterMap Highways Network Known Data Issues
    • OS MasterMap Highways Network – Routing and Asset Management Information
      • OS MasterMap Highways Network Overview
      • OS MasterMap Highways Network – Routing and Asset Management Information Technical Specification
        • Specification changes
        • How the product fits together
        • Routing and Asset Management feature information
          • Data types
            • NetworkReference
            • NodeReference
            • LinkReference
            • PointReference
            • Multiple Link Reference
            • Point Reference
        • Common attribution
        • Rights and Restrictions
          • Feature types
            • AccessRestriction
            • HighwayDedication
            • TurnRestriction
            • RestrictionForVehicles
        • Advisory information
          • Feature types
            • Hazard
            • Structure
        • Asset management
          • Feature types
            • Maintenance
            • Reinstatement
            • Special Designation
        • Change-Only Update (COU) supply
        • Code lists and enumerations
          • ChangeValue
          • UseTypeValue
          • VehicleTypeValue
          • LoadTypeValue
          • NamedDateValue
          • NamedDayValue
          • NamedPeriodValue
          • NamedTimeValue
          • AccessRestrictionValue
          • DedicationValue
          • TurnRestrictionValue
          • RestrictionTypeValue
          • HazardTypeValue
          • StructureTypeValue
          • ReinstatementTypeValue
          • SpecialDesignationTypeValue
          • LinkDirectionValue
          • MaintenanceValue
        • Data types
          • TemporalPropertyType
          • DateRangeType
          • DayPropertyType
          • TimePropertyType
          • TimeRangeType
          • TrafficRegulationOrderType
          • VehicleQualifier
          • ResponsibleAuthority
          • Identifier
        • GML overview
        • GeoPackage overview
          • Access Restriction
          • Highway Dedication
          • Turn Restriction
          • Restriction for Vehicles
          • Hazard Point
          • Hazard
          • Structure Point
          • Structure
          • Maintenance
          • Maintenance Point
          • Maintenance Line
          • Maintenance Area
          • Reinstatement
        • GML examples
      • OS MasterMap Highways Network Getting Started Guide
      • OS MasterMap Highways Network Known Data Issues
    • OS MasterMap Highways Network – Paths
      • OS MasterMap Highways Network Overview
      • OS MasterMap Highways Network – Paths Technical Specification
        • Specification changes
        • Structure
        • How does the product fit together?
        • Change-Only Update (COU) Supply
        • Feature types
          • PathLink
          • PathNode
          • ConnectingLink
          • ConnectingNode
          • Path
          • Street
          • FerryLink
          • FerryNode
          • FerryTerminal
          • Maintenance
          • Reinstatement
          • SpecialDesignation
          • HighwayDedication
        • Structured data types
          • Identifier
          • CycleFacilityType
          • ElevationGainType
          • OperationalStateType
          • DesignatedNameType
          • ResponsibleAuthority
          • TemporalPropertyType
          • DateRangeType
          • DayPropertyType
          • TimePropertyType
          • TimeRangeType
        • Data types
          • NetworkReferenceLocation
          • Temporal Properties
        • Code lists and Enumerations
          • ChangeValue
          • FormOfWayValue
          • SurfaceTypeValue
          • MatchStatusValue
          • ProvenanceSourceValue
          • CycleFacilityValue
          • FormOfRoadNodeValue
          • RoadNodeClassificationValue
          • OperationalStateValue
          • StreetTypeValue
          • ConnectionTypeValue
          • FormOfWaterwayNodeValue
          • DedicationValue
          • ReinstatementTypeValue
          • SpecialDesignationTypeValue
          • MaintenanceValue
        • GML Overview
        • GeoPackage overview
          • connecting_link
          • connecting_node
          • ferry_link
          • ferry_node
          • ferry_terminal
          • highway_dedication
          • maintenance
          • path
          • path_link
          • path_node
          • reinstatement
          • special_designation
          • street
        • Vector tiles overview
          • connecting_node
          • ferry_link
          • ferry_node
          • highway_dedication
          • path_link
          • path_node
          • street
        • GML examples
      • OS MasterMap Highways Network Getting Started Guide
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    • OS MasterMap Water Network Layer
      • Release Notes
        • April 2025
        • January 2025
        • October 2024
        • April 2024
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        • Feature types in the product
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        • Requirements for using the data
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        • Loading GML data into a GIS
        • Creating a water network using ESRI software
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        • Product notes
          • January 2022 product notes
        • Product structure
        • Feature types
          • WatercourseLink
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        • Structured data types
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          • LinkDirectionValue
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          • VerticalPositionValue
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        • Feature types for future release
          • WatercourseSeparatedCrossing
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        • GML overview
        • GeoPackage overview
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        • Vector tiles overview
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          • HydroNode
        • Data provenance
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      • OS MRN Technical Specification
        • Feature types
          • Transport Link
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        • Code lists
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          • GeoPackage format changes April 2023
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      • OS Open Rivers Downloads
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  • Topography
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        • What do I need to use this data?
        • Product supply information
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        • Importing data into a database
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        • Product supply
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      • OS MasterMap Topography Layer – Building Height Attribute Downloads
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      • OS MasterMap Greenspace Layer Downloads
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        • April 2025
        • October 2024
        • April 2024
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        • QGIS
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        • Astun Technology GML/KML Loader
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        • Data specification overview
        • Theme definitions
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        • Functional site extent overview
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        • Feature types
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          • ReasonForChangeValue
        • Code lists
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          • FunctionThemeValue
        • Geometry
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        • Vector tiles
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        • November 2024
        • September 2024
        • August 2024
        • June 2024
        • May 2024
        • April 2024
      • Product Refresh Dates
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        • Product purpose
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        • Styling
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          • Product supply mechanism and options
          • GML supply options
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        • Change management and data association
      • OS MasterMap Topography Layer Getting Started Guide
        • QGIS
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      • OS MasterMap Topography Layer Getting Started with Styling Guide
        • Styling method overview
        • How to use the SQL scripts
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        • Attribute tables
      • OS MasterMap Topography Layer Standard Styling Specification
        • Cartographic styling
        • Cartographic style definitions
        • Cartographic styling for new descriptive terms
          • TopographicArea
          • TopographicLine
          • TopographicPoint
        • Shared symbol geometry
        • Point symbols
        • Fill symbols
        • Compound symbols
        • Pattern definitions
        • Line styles
        • Cartographic descriptive term style definitions
      • OS MasterMap Topography Layer Technical Specification
        • File naming
        • Supply mechanisms
        • Product themes
          • Administrative Boundaries
          • Buildings
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          • Land
          • Rail
          • Roads, Tracks, and Paths
          • Structures
          • Terrain and Height
          • Water
        • Feature types
          • TopographicPoint
          • TopographicLine
          • TopographicArea
          • BoundaryLine
          • CartographicSymbol
          • CartographicText
        • Complex attributes
          • ChangeHistoryType
          • HeightAboveDatumType
          • HeightAboveGroundLevelType
          • TextRenderingType
        • Enumerations
          • ThemeValue
          • DescriptiveGroupValue
          • AccuracyOfPositionValue
          • ReasonForChangeValue
          • PhysicalPresenceValue
          • MakeValue
          • DescriptiveTermValue
        • Geometric data types
        • Topology
        • Seamless data supply
        • Feature lifecycles and tracking change
          • Polygon feature lifecycle rules
          • Line feature lifecycle rules
          • General point feature lifecycle rules
        • GML overview
          • GML examples
        • GeoPackage overview
        • Vector tiles overview
        • Attribute mapping
        • Geometry mapping
        • COU overview
        • Feature code lookup table
        • Change value descriptions
        • Administrative boundary alignments
      • OS MasterMap Topography Layer Downloads
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    • OS Open Greenspace
      • Release Notes
        • April 2025
        • October 2024
      • OS Open Greenspace Overview
        • Product details
        • Data creation
        • Product supply
      • OS Open Greenspace Getting Started Guide
        • QGIS
        • ESRI ArcGIS
        • PostGIS
        • MapInfo Professional
        • Cadcorp Map Modeller
      • OS Open Greenspace Technical Specification
        • Data structure
        • Feature types
          • GreenspaceSite
          • AccessPoint
        • Code lists
          • AccessTypeValue
          • FunctionValue
        • GML overview
        • GeoPackage overview
        • Vector tiles overview
        • Attribute mapping
      • OS Open Greenspace Downloads
      • OS Open Greenspace Known Data Issues
  • Identifiers
    • Identifiers Portfolio Information
    • OS Open Identifiers Family Information
    • OS Open Linked Identifiers
      • Release Notes
        • May 2025 – Epoch 43
        • March 2025 – Epoch 42
        • February 2025 – Epoch 41
        • January 2025 – Epoch 40
        • November 2024 – Epoch 39
        • October 2024 – Epoch 38
        • August 2024 – Epoch 37
        • July 2024 – Epoch 36
      • OS Open Linked Identifiers Overview
        • Uses of OS Open Linked Identifiers
        • Product details
      • OS Open Linked Identifiers Getting Started Guide
        • Linked identifiers
        • Instructions to install/load into a database application
      • OS Open Linked Identifiers Technical Specification
        • Product structure
        • Linked Identifier data (CSV) attributes
        • Product Version Information file (JSON)
        • RoadLink_TOID_TopographicArea_TOID_2
        • Road_TOID_TopographicArea_TOID_3
        • Street_USRN_TopographicArea_TOID_4
        • BLPU_UPRN_TopographicArea_TOID_5
        • RoadLink_TOID_Road_TOID_7
        • RoadLink_TOID_Street_USRN_8
        • BLPU_UPRN_RoadLink_TOID_9
        • Road_TOID_Street_USRN_10
        • BLPU_UPRN_Street_USRN_11
        • ORRoadLink_GUID_RoadLink_TOID_12
        • ORRoadNode_GUID_RoadLink_TOID_13
      • OS Open Linked Identifiers Known Data Issues
    • OS Open TOID
      • Release Notes
        • May 2025 – Epoch 43
        • March 2025 – Epoch 42
        • February 2025 – Epoch 41
        • January 2025 – Epoch 40
        • November 2024 – Epoch 39
        • September 2024 – Epoch 38
        • August 2024 – Epoch 37
        • July 2024 – Epoch 36
      • OS Open TOID Overview
        • Product supply
        • Coordinate reference system
      • OS Open TOID Technical Specification
        • Product Details
        • Data structure
        • Product Supply
      • OS Open TOID Known Data Issues
    • OS Open UPRN
      • Release Notes
        • May 2025
        • March 2025
        • February 2025
        • December 2024
        • November 2024
        • September 2024
      • OS Open UPRN Overview
        • Product supply
        • Coordinate reference systems
      • OS Open UPRN Technical Specification
        • Feature type
          • OS Open UPRN
      • OS Open UPRN Known Data Issues
    • OS Open USRN
      • Release Notes
        • May 2025
        • April 2025
        • March 2025
        • February 2025
        • January 2025
        • December 2024
        • November 2024
        • October 2024
        • September 2024
        • August 2024
        • July 2024
      • OS Open USRN Overview
        • Product supply
        • Coordinate reference system
      • OS Open USRN Technical Specification
        • Street Type
        • Feature type
          • OS Open USRN
        • Geometry
        • Metadata
      • OS Open USRN Known Data Issues
  • Height and imagery
    • Height and Imagery Portfolio Information
    • 🆕OS 3D Mesh (Beta Product)
      • 🆕OS 3D Mesh Overview
        • 🆕Product data
        • 🆕Feature modelling
      • 🆕OS 3D Mesh Getting Started Guide
        • 🆕Importing an OS integrated mesh model into ArcGIS Pro
          • 🆕Navigation
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Glossary term
Definition

accuracy

The closeness of the results of observations, computations or estimates to the true values or the values accepted as being true. Accuracy relates to the exactness of the result and is the exactness of the operation by which the result is obtained.

American Standard Code for Information Interchange (ASCII)

A 7 bit code for encoding a standard character set.

area

A spatial extent defined by circumscribing lines that form a closed perimeter that does not intersect itself.

attribute

An attribute is a property of an entity, usually used to refer to a non spatial qualification of a spatially referenced entity. For example, a name or descriptive code indicating what an entity represents or how it should be portrayed.

attribute code

An alphanumeric identifier for an attribute type.

boundary

Boundaries define the areas of the various national and local government authorities and some European authorities.

chain

A closed loop of links bounding a polygon.

code

An alphanumeric attribute code used in digital map data to describe each feature in terms either of the object surveyed or its representation on the map (or both).

coding

Allocation of a feature code to a feature being created from constituent construction data – points and/or segments; with optional linking to an existing feature of the same feature code.

contour

A line connecting points of equal elevation.

coordinate pair

A coordinate pair is an easting and a northing.

coordinates

Pairs of numbers expressing horizontal distances along original axes. Alternatively, triplets of numbers measuring horizontal and vertical distances. Row and column numbers of pixels from raw imagery are not considered coordinates for the purpose of the standard.

data format

A specification that defines the order in which data is stored or a description of the way data is held in a file or record.

data model

An abstraction of the real world that incorporates only those properties thought to be relevant to the application or applications at hand. The data model would normally define specific groups of entities and their attributes, and the relationship between these entities. A data model is independent of a computer system and its associated data structures. A map is one example of an analogue data model.

data structure

The defined logical arrangement of data as used by a system for data management; a representation of a data model in computer form.

eastings

See rectangular coordinates.

entity

Something about which data is stored in a databank or database. For example, boundary and name. The data may consist of relationships, attributes, positional and shape information and so on. Often synonymous with feature.

Extensible Markup Language (XML)

This is a markup language written in a textual data format designed to encode documents and data structures for transfer over the Internet. It was developed by the World Wide Web Consortium (W3C). XML schemas express shared vocabularies and allow machines to carry out rules made by people. They provide a means for defining the structure, content, and semantics of XML documents.

Extensible Stylesheet Language Transformations (XSLT)

This is a language for transforming XML documents into objects that can be presented in a format that is more easily read by the user, such as HTML for web pages or plain text.

feature

An item of detail within a map that can be a point and/or symbol, text, or line.

feature identifier

A unique code to identify an individual feature. A specified part of a record containing a unit of data, such as the date of digitising. The unit of data may be a data element or a data item.

feature record

The logical information, both spatial and attribute, describing a feature or entity.

geographical information system (GIS)

A system for capturing, storing, checking, integrating, analysing, and displaying data that is spatially referenced to the Earth. This is normally considered to involve a spatially referenced computer database and appropriate applications software.

Geography Markup Language (GML)

GML was developed by the Open Geospatial Consortium (OGC), a global organisation of developers and users that aims to maximise the benefit of geographic information. GML is a spatially enabled dialect of XML schema.

layer

A subset of digital map data selected on a basis other than position. For example, one layer might consist of all features relating to counties and another to wards. Also known as a level.

level

A level corresponds to a single type of administrative unit, for example, a ward or a district, and is conceptual in form. See also layer.

line

A series of connected coordinated points forming a simple feature with homogeneous attribution.

line feature

The spatial abstraction of an object in one dimension. Lines may intersect with other lines. They are defined as a series of two or more coordinate pairs and may be curved or straight. Curved lines consist of a series of very short straight-line segments. As an object abstraction, a line has no width.

line segment

A vector connecting two coordinated points.

link or edge

Links are the representation of line features. They are made up of one or more consecutive non intersecting link segments with common attributes between two terminating nodes. Links have no connection with other links except at the start or end, via common (shared) terminating nodes (points). All links contain their terminating coordinates. Links may form the boundaries of polygons and may be shared between polygons.

map scale

The ratio between the extent of a feature on the map and its extent on the ground, normally expressed as a representative fraction, such as 1:1,250 or 1:10 000.

name

The proper name or label of an object (real world) or feature (object abstraction). The descriptive name might consist of one or more text strings or be an attribute of the object or object abstraction.

National Grid

A unique referencing system that can be applied to all Ordnance Survey maps of Great Britain (GB) at all scales. It is used by Ordnance Survey on all post war mapping to provide an unambiguous spatial reference in Great Britain for any place or entity, whatever the map scale. The National Grid is defined by the OSGB36 spheroid.

Northings

See rectangular coordinates.

object

A collection of entities which form a higher-level entity within a specific data model.

object (real world)

A recognisable discrete part of the real world.

origin

The zero point in a system of rectangular coordinates.

point and line data

A form of vector data designed for map production in which all map features are designated as points, lines, or text. Point and line data does not carry the topological relationships between features.

polygon

Polygons are a representation of areas. A polygon is defined as a closed line or perimeter completely enclosing a contiguous space and is made up of one or more links. At least one node occurs on the perimeter of a polygon where the bounding link completes the enclosure of the area. There may be many nodes connecting the bounding links of a polygon. Links may be shared between polygons. Polygons may wholly contain other polygons or be contained within other polygons.

polygon boundary

The link(s) which enclose a polygon, projected into the horizontal plane. A chain.

record

A set of related data fields grouped for processing.

rectangular coordinates

Also known as X Y coordinates and as eastings and northings. These are two dimensional coordinates that measure the position of any point relative to an arbitrary origin on a plane surface (for example, a map projection).

resolution

A measure of the ability to detect quantities. High resolution implies a high degree of discrimination but has no implication as to accuracy. For example, in a collection of data in which the coordinates are rounded to the nearest metre, resolution is 1metre, but the accuracy may be ± 5metres or worse.

segment

A chord defined by two consecutive coordinates in a line string.

shapefile

This is a data format developed by Esri to describe features such as points, lines, and polygons to enable spatial analysis. A shapefile consists of several files designed to hold information essential for the transfer of this data between software products which are capable of reading shapefiles.

spatial data

Data that includes a reference to a two or three dimensional position in space as one of its attributes. It is used as a synonym for geometric data.

spot height

A point on the Earth’s surface for which the height, above a reference datum, is known and which has been fixed by observation.

String

A set of items which can be arranged into a sequence according to a rule. A sequence of coordinate pairs or triplets making up a line or a link.

structured data

Data within which collections of features (of any type) form objects. Topographically structured data also contains topological information, defining the relationships between features and objects.

Topography

The study of the physical features of the Earth. A topographic map’s principal purpose is to portray and identify the features of the Earth.

Topology

The study of the properties of a geometric figure that are not dependant on position, such as connectivity and relationships between lines, nodes, and polygons.

Vector

A straight line joining two data points.

vector data

Positional data in the form of coordinates of the ends of line segments, points, text positions and so on.

  1. Height and imagery
  2. OS Terrain 5
  3. OS Terrain 5 Technical Specification

Product glossary

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