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This chapter describes the GML format for OS VectorMap District. It is recommended that you read this in conjunction with the Open Geospatial Consortium (OGC) document, Geography Markup Language v3.2.1.
The XML specifications that GML is based on are available from the World Wide Web Consortium (W3C®) website: http://www.w3.org.
Information about Unicode and UTF-8, the character encoding we have chosen, is available on the Unicode Consortium website: http://www.unicode.org/.
Any examples in this chapter that mention specific data content are to be taken as examples only.
A property of a feature implemented as an XML element, as defined in ISO 19109.
Attribute as used in an XML context is referred to as an XML attribute.
Most feature attributes are encoded as GML properties – property means a GML property.
XML schemas are used to define and validate the format and content of the GML. The GML v3.2 specification provides a set of schemas that define the GML feature constructs and geometric types. These are designed to be used as a basis for building application-specific schemas, which define the data content.
The Ordnance Survey application schemas, which are referenced by the data, are available in the product release.
These schemas make use of XSDs (XML schema definitions) and DTDs (document type definitions) produced by the W3C®, which are available from the W3C website at http://www.w3.org/XML/1998/namespace.html.
The W3C-provided XSDs and DTDs are:
xml.xsd – to allow the use of the xml:lang attribute for language qualification.
XMLSchema.dtd – required by xml.xsd.
datatypes.dtd – required by XMLSchema.dtd. The OGC-provided schemas are:
feature.xsd – the feature and property constructs.
geometry.xsd – the geometric constructs such as polygon and point.
xlinks.xsd – a schema based on the W3C XLINK recommendation provided by the OGC to make use of the XLINK constructs.
The Ordnance Survey-provided schema is:
district.xsd – the feature type, complex type and simple type declarations.
The ‘OSVectorMapDistrict’ schema document defines the following XML namespaces:
xlink: http://www.w3.org/1999/xlink
The location of the schema is defined as:
http://namespaces.os.uk/cmd/district/v2.1
https://os.uk/xml/cmdschema/district/v2.1/district.xsd
Features within each tile are provided in a FeatureCollection.
GML is designed to support a wide variety of capabilities, ranging from simple contextual mapping, such as
OS VectorMap District, to products that include complex geometric property types or even spatial and temporal topology. The Simple Features Profile of GML 3.2 defines a restricted subset of GML, allowing scope for greater interoperability.
This product conforms to Simple Features Profile – Level 0.
A geometric property is one that describes a specific geometry. All geometric properties are encoded according to the Simple Features Profile, as referenced above.
The XML attribute ‘srsName’ shall be set to ‘urn:ogc:def:crs:EPSG::27700’, which uses eastings and northings specified in metres.
EPSG (European Petroleum Survey Group) provides numeric identifiers for many common projections and associated projection or coordinate metadata (such as measurement units or central meridian) for each identifier.
All exterior polygon boundaries have an anticlockwise orientation and all interior polygon boundaries have a clockwise orientation.
Raw GML data extract from NT VMD GML open data styled using open GIS software.
A definition for registering raster images within a geographic framework is the process of assigning map coordinates to the raster image data and re-sampling the pixels of the image to conform to the map projection grid. This allows tiles of map data to be located in their correct geographic position relative to the map projection and also to themselves.
Great Britain is surveyed and mapped using the Transverse Mercator (or Gauss-Kruger) projection, so all raster tiles will be mapped to this projection as it applies to Ordnance Survey National Grid if using World or TAB files supplied by Ordnance Survey.
Within the MIF record header the following information will be found under COORDSYS:
CoordSys Earth Projection 8, 79, "m", -2, 49, 0.9996012717, 400000, -100000 Bounds (4.17232513428e-011, 7.7486038208e-011) (700000, 1300000)
This information relates to the Transverse Mercator projection, its position relative to the rest of the world and also an individual tile’s position relative to the projection. The record header is constructed as (not all fields have to be used):
CoordSys Earth Projection 8 The 8 relates to a MapInfo identifier, in this case the Transverse Mercator projection.
79 a MapInfo identifier, in this case this relates to Ordnance Survey of Great Britain 1936, Airy ellipsoid.
“m” relates to the unit of measurement, in this case metres.
-2 this is the origin of the projection in respect of longitude.
49 this is the origin of the projection in respect of latitude.
0.9996012717 indicates the distortion of the tile at the central meridian. A value of 1.0 would indicate no distortion at all. However, distortion within this projection is minimal even at the far western or eastern limits.
400000, -100000 these figures indicate the false origin of the British National Grid.
They represent the south-west corner of the Transverse Mercator projection, which overlays Great Britain, so all coordinates for any tile, no matter what scale, will always be positive.
Bounds: (4.17232513428e-011, 7.7486038208e-011) these values represent the minimum bounding X and Y coordinates for the tile. (700000, 1300000) these values represent the maximum bounding X and Y coordinates for the tile.
Both Legends can be found on the website and downloaded
A building constructed largely of glass for the purposes of commercial horticulture. This is a generalised glasshouse and could be made up of an amalgamation of individual glasshouses. Only glasshouses larger than 5000 m2 are included.
Belongs to: Buildings and Structures
Polygon representing the generalised glasshouse.
Type: GM_Surface
Multiplicity: [1]
A unique feature code to facilitate styling.
Type: Integer
Multiplicity: [1]
This section describes the three features available in the OS VectorMap District product. The attributes associated with these feature types are listed below along with a brief description of their data properties.
The name of the attribute and what it is describing.
The nature of the attribute, for example a numeric value or a code list value.
The length of the attribute provided (optional).
Describes how many times this element is expected to be populated in the data. An attribute may be optional or mandatory within the product. These are denoted by:
‘1’ there must be a value.
‘2’ there must be two values.
‘n’ there may be one or more values.
‘0’ population is optional.
An association identifies the relationship between features. These relationships are by reference only and the value will be the identifier of the referenced feature.
The product contains twenty one feature types:
Building
ElectricityTransmissionLine
Glasshouse
RailwayStation
RailwayTrack
RailwayTunnel
MotorwayJunction
Road
RoadTunnel
Roundabout
Foreshore
SurfaceWater_Area
SurfaceWater_Line
TidalBoundary
TidalWater
Woodland
FunctionalSite
NamedPlace
SpotHeight
AdministrativeBoundary
Ornament
Point feature representing the buildings and platforms by a railway line where a train may stop to pick-up or drop-off goods or passengers.
Belongs to: Buildings and Structures
The name of the station, consistent with the names used by National Rail Enquiries. The suffix ‘Station’ is not added to the name.
Type: CharacterString
Length: 150
Multiplicity: [1]
The classification of the RailwayStation. The valid values are defined in the RailwayStationClassification code list.
Type: RailwayStationClassification
Length: 65
Multiplicity: [1]
Point representing the position of the railway station.
Type: GM_Point
Multiplicity: [1]
A unique feature code to facilitate styling. Each classification value has a unique feature code.
Type: Integer
Multiplicity: [1]
A built entity that includes a roof. This is a generalised building and could be made up of an amalgamation of other buildings and structures.
Belongs to: Buildings and Structures
Polygon representing the generalised building.
Type: GM_Surface
Multiplicity: [1]
A unique feature code to facilitate styling.
Type: Integer
Multiplicity: [1]
Railway tunnels are represented as approximate centrelines of the railway that runs through the tunnel.
Belongs to: Communications – Rail
Railway tunnels are represented as approximate centrelines of the railway that runs through the tunnel.
Line representing the alignment of the railway tunnel.
Type: GM_Curve
Multiplicity: [1]
A unique feature code to facilitate styling.
Type: Integer
Multiplicity: [1]
This technical specification provides detailed technical information about OS VectorMap District. It is targeted at technical users and software developers.
OS VectorMap District is a mapping dataset designed for providing contextual mapping output on paper, PCs, handheld devices or the Internet. The vector format of the product consists of layers to enable you to customise and style output to suit your needs.
The product can be used as mapping in its own right or can be used to provide a flexible geographic context reference for customers' overlay information.
The nominal viewing scale is 1:25 000, with a recommended viewing scale range of 1:10 000 to 1:25 000. The data is available on DVD; or download as.zip file
OS VectorMap District will be supplied in three open source formats:
Vector data in Geography Markup Language (GML) 3.2 Simple Features Profile level 1.
A national vector dataset in ESRI® Shapefile.
Specific National Grid Reference square(s) in ESRI Shapefile.
Each feature will be given a unique identifier. The GML product will have the property gml:id which will hold the features unique identifier. The ESRI Shapefile will have the property ID which will hold each features unique identifier. The identifier will not be persistent between product versions and therefore there will be no change history information for a feature.
The data structure is described below by means of UML class diagrams and accompanying tables containing text. The UML diagrams conform to the approach specified in ISO 19103 Conceptual schema.
Colour conventions have been used in the diagrams and tables to distinguish the properties that have been added in this specification.
In the UML diagram classes in the Ordnance Survey product specification are orange. All code lists are coloured blue. The tables which follow in this Technical Specification use orange for a feature type and blue for a code list.
Class names are conceptually meaningful names (singular noun) in UpperCamelCase
Class names end in “Value” or “Classification” where the class is assigned the stereotype <<CodeList>>
Property names (attributes and associations) are in lowerCamelCase
The following stereotypes are used on UML elements:
| Stereotype | UML Element | Description |
|---|---|---|
FeatureType
Class
A spatial object type. [ISO 19136].
CodeList
Class
A controlled set of values for a free text data type that may be extended.
Road tunnels are represented as approximate centrelines of the road that runs through the tunnel.
Belongs to: Communications – Road
Line representing the alignment of the road tunnel.
Type: GM_Curve
Multiplicity: [1]
A unique feature code to facilitate styling.
Type: Integer
Multiplicity: [1]
The following chapters include information about OS VectorMap District raster, file compression, symbology, georeferencing and formats.
Data Source: Derived data
Number of tiles in Great Britain: 2863 (edgematched)
Tile size: 10 km x 10 km
Because digital maps frequently cover very large areas they are split down into squares known as tiles, each of which covers part of an overall area.
Availability: National, country and tile supply available
Resolution: 254 dots per inch
Data structure: Raster
Data Specification: Selection of map features combined
Colour Palette: 256 fixed colours
Transfer format: TIFF 8-bit LZW* compressed
Storage Volume per tile: Compressed: approx. 6.7mb
Greyscale: A high-quality alternative to colour raster data is to use a GIS to convert data to a greyscale format.
*If LZW compressed formats are used then registration may be required.
OS VectorMap District is supplied in the following raster formats: TIFF 8-bit LZW compressed (6.7 mb)
Cables used to supply electricity that are suspended between pylons.
Belongs to: Buildings and Structures
Line representing the alignment of the electricity transmission line.
Type: GM_Curve
Multiplicity: [1]
A unique feature code to facilitate styling.
Type: Integer
Multiplicity: [1]
A road is defined as a metalled way for vehicles. A vehicle is defined as one with wheels on both sides of its body. Metalling is defined as any artificial (man-made) surface including areas of asphalt, concrete and gravel. Roads that form part of the public network and driveways to private properties that are over 100 m in length are captured.
Dual carriageways are represented by centrelines when the two carriageways are closer than 32.5 m, roundabouts are represented by points when smaller than 450 m2, dead ends are removed when shorter than 36 m and roads are simplified with a 4 m tolerance.
Belongs to: Communications – Road
The name of the road. When a road is dual named, the Welsh or Gaelic name is presented first, followed by a space, a forward slash, a space and then the English name.
Type: CharacterString
Length: 100
Multiplicity: [0..1]
For roads with RoadClassification of Motorway, Primary Road, A Road and B Road, this is the number of the road defined by the Department for Transport.
Type: CharacterString
Length: 10
Multiplicity: [0..1]
The classification of the road. The valid values are defined in the RoadClassification code list.
Type: RoadClassification
Length: 45
Multiplicity: [1]
The drawLevel value of the road, used for cartographic styling. The valid values are defined in the DrawLevelValue code list.
Type: DrawLevelValue
Length: 1
Multiplicity: [1]
The override value of the road used for cartographic styling. The valid values are defined in the OverrideValue code list.
Type: OverrideValue
Length: 1
Multiplicity: [1]
Line representing the alignment of the road.
Type: GM_Curve
Multiplicity: [1]
A unique feature code to facilitate styling. Each classification value has a unique feature code.
Type: Integer
Multiplicity: [1]
Point feature representing the approximate location of numbered junction on a motorway.
Belongs to: Communications – Road
The motorway junction number assigned by the Department for Transport.
Type: CharacterString
Length: 10
Multiplicity: [1]
Point representing the position of the motorway junction.
Type: GM_Point
Multiplicity: [1]
A unique feature code to facilitate styling.
Type: Integer
Multiplicity: [1]
All railways are represented as lines and are broken where they pass under bridges, buildings or other obstructing detail. Railway sidings and the tracks of travelling structures are not included.
Belongs to: Communications – Rail
The classification of the RailwayTrack. The valid values are defined in the RailwayTrackClassification code list.
Type: RailwayTrackClassification
Length: 45
Multiplicity: [1]
Line representing the alignment of the railway track.
Type: GM_Curve
Multiplicity: [1]
A unique feature code to facilitate styling. Each classification value has a unique feature code.
Type: Integer
Multiplicity: [1]
An inland waterway body sufficiently wide enough to capture as an area feature. Small lakes and small islands in waterbodies are not included.
Belongs to: Hydrology
Polygon representing the area of surface water.
Type: GM_Surface
Multiplicity: [1]
A unique feature code to facilitate styling.
Type: Integer
Multiplicity: [1]
The part of the shore or beach which lies between the Low Water Mark and High Water Mark defined by the TidalBoundaries. The same condition may exist in non-contiguous off-shore areas.
Belongs to: Hydrology
Polygon representing the area of foreshore.
Type: GM_Surface
Multiplicity: [1]
A unique feature code to facilitate styling.
Type: Integer
Multiplicity: [1]
Roundabouts smaller than 450 m2 are represented as point features, and the roads are extended to meet at the centre point. Mini roundabouts are not included.
Belongs to: Communications – Road
The classification of the roundabout. The valid values are defined in the RoundaboutClassification code list.
Type: RoundaboutClassification
Length: 45
Multiplicity: [1]
Point representing the position of the roundabout.
Type: GM_Point
Multiplicity: [1]
A unique feature code to facilitate styling. Each classification value has a unique feature code.
Type: Integer
Multiplicity: [1]
Ornament features are facsimiles of artwork, represented as polygons, originally drawn on paper maps to depict coastal rocks, outcropping rocks, boulders, cartographic slopes and scree.
Belongs to: Land Cover
Polygon representing an individual element of hand-drawn ornament.
Type: GM_Surface
Multiplicity: [1]
A unique feature code to facilitate styling.
Type: Integer
Multiplicity: [1]
Polygons defining the extents of tidal water, up to the High Water Mark defined by the TidalBoundaries and the Normal Tidal Limit of rivers. Tidal water is not included under bridges.
Belongs to: Hydrology
Polygon representing the area of tidal water.
Type: GM_Surface
Multiplicity: [1]
A unique feature code to facilitate styling.
Type: Integer
Multiplicity: [1]
An inland waterway body not sufficiently wide enough to capture as an area feature.
Belongs to: Hydrology
Line representing the alignment of the surface water.
Type: GM_Curve
Multiplicity: [1]
A unique feature code to facilitate styling.
Type: Integer
Multiplicity: [1]
Point feature which in most cases represents the location of a summit of a hill or mountain, together with an elevation measurement.
Belongs to: Height
The elevation of the point above datum, rounded to the nearest metre.
Type: Measure
Multiplicity: [1]
In most cases the location of a summit of a hill or mountain, rounded to the nearest metre.
Type: GM_Point
Multiplicity: [1]
A unique feature code to facilitate styling.
Type: Integer
Multiplicity: [1]
In England and Wales these tide lines will be the levels of mean tides, for example, of a tide between a spring and neap tide. In Scotland the tide lines are those of mean spring tides. In places where there is no Foreshore (For example, vertical cliffs), the TidalBoundary is classified as 'High Water Mark'.
Belongs to: Hydrology
The classification of the TidalBoundary. The valid values are defined in the TidalBoundaryClassification code list.
Type: TidalBoundaryClassification
Length: 45
Multiplicity: [1]
Line representing the alignment of the tidal boundary.
Type: GM_Curve
Multiplicity: [1]
A unique feature code to facilitate styling. Each classification value has a unique feature code.
Type: Integer
Multiplicity: [1]
A line feature representing the limit of a government administrative area. In the event that a boundary represents the limit of more than one administrative area, classifications are applied in hierarchical order, with priority given to the largest containing area. An exception is made for National boundaries, which will be coincident with the underlying local government boundary.
Belongs to: Administrative Boundaries
The classification of the AdministrativeBoundary. The valid values are defined in the AdministrativeBoundaryClassification code list.
Type: AdministrativeBoundaryClassification
Length: 45
Multiplicity: [1]
Represents the limit of a government administrative area.
Type: GM_Curve
Multiplicity: [1]
A unique feature code to facilitate styling. Each classification value has a unique feature code.
Type: Integer
Multiplicity: [1]
Light Rapid Transit Station
A station on a railway designed for the transport of passengers within areas that are primarily urban. Characterised by high density of stations, large passenger volumes and relatively short journeys. They have many names in local use such as Tram, Underground, Metro, Tramlink and so on.
Railway Station
A station on the main national passenger rail network. Such lines may also carry freight. Also includes stations on railways that have been maintained or restored by an individual, group or society.
They may be open for tourist and/or local use and are often called Heritage Lines.
London Underground Station
A subtytpe of Light Rapid Transit Station within the London area managed by Transport for London. Stations, part of the London Underground network are uniquely identified for historic reasons.
Railway Station And London Underground Station
A station that functions both as a Railway Station and a London Underground Station. Also includes rare cases where additionally the station functions as a Light Rapid Transport Station.
Light Rapid Transit Station And Railway Station
A station that functions both as a Light Rapid Transit Station and a Railway Station.
Light Rapid Transit Station And London Underground Station
A station that functions both as a Light Rapid Transit Station and a London Underground Station.
A representative point feature giving the general location of a settlement name or geographic place name, for the purposes of text placement.
Belongs to: Named Places
The settlement name or geographic place name. When a place is dual named, the Welsh or Gaelic name is presented first, followed by a space, a forward slash, a space and then the English name.
Type: CharacterString
Length: 100
Multiplicity: [1]
The classification of the NamedPlace. The valid values are defined in the NamedPlaceClassification code list.
Type: NamedPlaceClassification
Length: 40
Multiplicity: [1]
A suggested text size to use for placing the distinctiveName as cartographic text. For most names the text size is proportional to the size of the area to which the name applies. For valleys the text size is based on the valley length and for hills/mountains, the text size is based on the height of the summit. The valid values are defined in the FontHeightClassification code list.
Type: FontHeightClassification
Length: 11
Multiplicity: [1]
Suggested text orientation (in degrees) to use for cartographic text placement of valley names, names of stretches of water and estuaries.
Type: Measure
Multiplicity: [1]
Point representing the cartographic position of the named place.
Type: GM_Point
Multiplicity: [1]
A unique feature code to facilitate styling. Each classification value has a unique feature code.
Type: Integer
Multiplicity: [1]
A point feature that represents the location of certain types of function or activity with appropriate attribution.
Belongs to: Land Use
The name of the site (for example, ‘Brighton College’). Note this may be null if the captured value is a house number.
Type: CharacterString
Length: 150
Multiplicity: [0..1]
A description of the actual function of a site (that is, airfield, junior school, hospital and so on.) The valid values are defined in the FunctionalSiteClassification code list.
Type: FunctionalSiteClassification
Length: 65
Multiplicity: [1]
A representative point giving the general location of the functional site, for the purposes of text placement.
Type: GM_Point
Multiplicity: [1]
A unique feature code to facilitate styling. Each classification value has a unique feature code.
Type: Integer
Multiplicity: [1]
Areas of trees; coniferous, non-coniferous and mixed are represented as polygons. Small areas of woodland are omitted and small clearings in woodland are filled.
Belongs to: Land Cover
Polygon representing the area of woodland.
Type: GM_Surface
Multiplicity: [1]
A unique feature code to facilitate styling.
Type: Integer
Multiplicity: [1]
Motorway
A multi-carriageway public road connecting important cities, always numbered with no addresses. For dual carriageways, the carriageways in both travel directions are represented separately when they are more than 32.5 m apart.
Motorway, Collapsed Dual Carriageway
A multi-carriageway public road connecting important cities, always numbered with no addresses. For dual carriageways, the carriageways in both travel directions are represented by a single line when they are closer than 32.5 m apart.
Primary Road
A public road, classified as an A road or B road, that has been additionally classified as a primary route by the Department for Transport, to supplement the motorway network connecting important cities. For dual carriageways, the carriageways in both travel directions are represented separately when they are more than 32.5 m apart.
Primary Road, Collapsed Dual Carriageway
A public road, classified as an A road or B road, that has been additionally classified as a primary route by the Department for Transport, to supplement the motorway network connecting important cities. For dual carriageways, the carriageways in both travel directions are represented by a single line when they are closer than 32.5m apart.
A Road
A public road, classified as an A road by the Department for Transport, connecting areas of regional importance, always numbered, sometimes named, often with addresses. For dual carriageways, the carriageways in both travel directions are represented separately when they are more than 32.5 m apart.
A Road, Collapsed Dual Carriageway
A public road, classified as an A road by the Department for Transport, connecting areas of regional importance, always numbered, sometimes named, often with addresses. For dual carriageways, the carriageways in both travel directions are represented by a single line when they are closer than 32.5 m apart.
B Road
A public road, classified as a B road by the Department for Transport, connecting places of local significance, always numbered, sometimes named, often with addresses. For dual carriageways, the carriageways in both travel directions are represented separately when they are more than 32.5 m apart.
B Road, Collapsed Dual Carriageway
A public road, classified as a B road by the Department for Transport, connecting places of local significance, always numbered, sometimes named, often with addresses. For dual carriageways, the carriageways in both travel directions are represented by a single line when they are closer than 32.5 m apart.
Minor Road
A public road without a Department for Transport classification of motorway, A or B that connects the roads defined below to B and higher classification roads. In urban areas usually named, often with addresses. In rural areas sometimes named and sometimes with addresses. For dual carriageways, the carriageways in both travel directions are represented separately when they are more than 32.5 m apart.
Minor Road, Collapsed Dual Carriageway
A public road without a Department for Transport classification of motorway, A or B that connects the roads defined below to B and higher classification roads. In urban areas usually named, often with addresses. In rural areas sometimes named and sometimes with addresses. For dual carriageways, the carriageways in both travel directions are represented by a single line when they are closer than 32.5 m apart.
Local Street
A public road that provides access to land and/or houses, usually named with addresses. Generally not intended for through traffic. For dual carriageways, the carriageways in both travel directions are represented separately when they are more than 32.5 m apart and a single line when they are closer than 32.5 m apart.
Pedestrianised Street
Roads that have been altered for use principally by pedestrians but may provide some access for certain types of vehicle.
Private Road Publicly Accessible
A privately-maintained road or a road within a property boundary where access by the public is considered usual for at least some part of the day. For example, a road within a hospital, sports centre or school. They may extend through a site if more than one entrance exists. If only one entrance exists they are normally created to extend to the principal building within a single site or the boundary of the last property served for features accessing more than one addressed or otherwise identifiable property. They may be captured outside this definition if required to provide connectivity to a track or path. For dual carriageways, the carriageways in both travel directions are represented separately when they are more than 32.5 m apart and a single line when they are closer than 32.5 m apart.
0
The default draw level. Roads with draw level 0 are to be displayed first, with draw levels 1 and 2 overlaid on top.
1
Used for road bridges and overpasses. Roads with draw level 1 are to be overlaid on top of draw level 0 roads.
2
Used in very rare cases when there are several coincident levels of road bridge or overpass. Roads with draw level 2 are to be overlaid on top of draw levels 0 and 1.
F | The default value; has no impact on the styling of roads. |
T | Used when a higher classification road (for example a slip road) terminates at a T-junction with a lower classification road. This scenario can result in the colour of the higher classification road bleeding into the lower classification road. This attribute is used to override the standard road hierarchy, allowing the higher classification road to be pushed down the drawing order. |
High Water Mark | In England and Wales this is the mean level of all the high tides, in Scotland this is the mean level of the spring high tides. In places where there is no Foreshore (For example, vertical cliffs), the TidalBoundary is classified as High Water Mark. |
Low Water Mark | In England and Wales this is the mean level of all the low tides, in Scotland this is the mean level of the spring low tides. When there is Foreshore, this defines the lower limit of Foreshore. |
Primary Road | A roundabout smaller than 450 m2, where the highest classification through road is a Primary Road, as defined by RoadClassification. |
A Road | A roundabout smaller than 450 m2, where the highest classification through road is an A Road, as defined by RoadClassification. |
B Road | A roundabout smaller than 450 m2, where the highest classification through road is a B Road, as defined by RoadClassification. |
Minor Road | A roundabout smaller than 450 m2, where the highest classification through road is a Minor Road, as defined by RoadClassification. |
Local Street | A roundabout smaller than 450 m2, where the highest classification through road is a Local Street, as defined by RoadClassification. |
Private Road Publicly Accessible | A roundabout smaller than 450 m2, where the highest classification through road is a Private Road Publicly Accessible, as defined by RoadClassification. |
Multi Track
A representation of two or three parallel or near parallel pairs of rails up to a specified distance apart.
Single Track
A representation of a pair of rails that are not parallel or near parallel to another pair of rails within a specified distance.
Narrow Gauge
A representation of a pair of rails that are more than 0.508m and less than 1.435m apart. Also includes monorails.
A code list or enumeration is a controlled set of values which can be used to populate a specific column.
Populated Place
Name of a city, town, village, hamlet or other populated place.
Landform
Name of a landform, such as a hill, mountain, island, coastal rocks and so on.
Woodland Or Forest
Name of an area of woodland or forest.
Hydrography
Name of an area of surface or tidal water, such as a lake, reservoir, bay, estuary, sea channel or sea area.
Landcover
Name of an area of open landcover, such as a moor, heath, down or fen.
This section details an alternative approach for applying a background colour to areas of the map that are not covered by Tidal Water. The solution requires an ESRI shape file defining the spatial extents of each product to be provided as a download on the Ordnance Survey website as found here:
http://www.os.uk/business-and-government/help-and-support/products/geo-referencing.html These polygons are then styled in a GIS with the required colour for land:
OS VectorMap District polygons for TidalWater can then be overlaid on top. This ensures that the background land colour is only visible for areas of land:
Most GIS allow a background colour to be applied to the entire display window. In ArcMap this is achieved by right- clicking in the data frame, selecting Data Frame Properties, selecting the Frame tab and setting a background colour. The background colour should be set to be the same colour as TidalWater:
Polygons defining areas of land for the whole world can be downloaded from here: http://www.naturalearthdata.com/downloads/10m-physical-vectors/ (click on ‘Download land’)
This data is defined in the WGS84 coordinate system. Some GIS will transform this on-the-fly to British National Grid, for others it may be necessary to apply a coordinate transformation first. This data can be added to the map below the two existing layers (ProductExtents and TidalWater). This ensures that only the additional land masses beyond the areas maintained by Ordnance Survey are visible:
National
The alignment of the national boundaries, between England/Wales and between England/Scotland.
County Or Region Or Island
The alignment of the limits of an area of local government responsibility administered by county councils.
District Or London Borough
The alignment of the limits of an area of local government responsibility administered by district councils.
Parish Or Community
The alignment of the limits of an area of local government responsibility administered by parish councils.
Air Transport
This theme includes all sites associated with movement of passengers and goods by air, or where aircraft take off and land.
Education Facility - Higher
This theme includes a very broad group of sites with a common high level primary function of providing education (either state funded or by fees).
Education Facility - School
Includes a very broad group of sites with a common high level primary function of providing education (either state funded or by fees) up to the legal school leaving age. Includes First School, Infant School, Junior School, Middle School, Non State Primary Or Preparatory School, Non State Secondary School, Primary School, School, School For Special Needs and Secondary School sites.
Leisure Or Sports Centre
A staffed recreational establishment that is publicly available (which may require membership) and mainly, but not exclusively sports based (both indoors and/or outdoors). This site may include swimming pools and gymnasiums, facilities for exercise classes, bars and health spas.
Medical Care
This theme includes sites which focus on the provision of secondary medical care services.
Place Of Worship
An establishment where people can worship according to their particular Faith.
Police Station
The local office of a police force in a particular area.
Road Services
Includes two types of site: Filling Station and Road User Services.
Road Transport
This theme includes three types of sites: Bus Stations, Coach Stations and Road user services.
Water Transport
Includes sites involved in the transfer of passengers and or goods onto vessels for transport across water. Includes Passenger Ferry Terminal and Vehicular Ferry Terminal sites.
Small
Small text size.
Medium
Medium text size.
Large
Large text size.
Extra Large
Extra large text size.
| Attribute | Description | Example | Data Type | Valid values |
|---|---|---|---|---|
CLASSIFICA
(GML: classification)
Used to identify different types of feature within a particular class
RoadClassification
String
FONTHEIGHT
(GML: fontHeight)
Indicative of the height of the text in comparison to other features
Small
String
Small, Medium, Large or Extra Large
HEIGHT
(GML: height)
Ground height of heighted point in metres
123
Integer
0-1344
DISTNAME (GML:
distinctiveName)
Name of the road, airport, cartographic text, station, heritage site, ground height value
Romsey Road; Liverpool John Lennon Airport; Croydon
String
ROADNUMBER
(GML: roadNumber)
DFT road number
A32
String
JUNCTNUM (GML:
junctionNumber)
Motorway junction number
6a
String
ORIENTATIO (GML:
textOrientation)
Orientation of the text feature in degrees
24
Integer
-90 to 90
HTMLNAME
(GML: not present)
This attribute contains all names, including all accents. Those accented letters that do not have an ASCII value have HTML control characters
Coed Ty'n-llŵyn will be recorded as Coed Ty'n- ll<f>ŵ</f>yn
Pont Rhŷd-Dwrial will be recorded as and Pont Rh<f>ŷ</f>d-Dwrial
String
FEATCODE
(GML:featureCode)
Feature code which provides an alternative to using classification for styling
15014
Integer
See table on page 55
ID
(GML: gml_id)
Unique identifier, which can be used for
de-duplicating across tile boundaries.
Identifiers will be regenerated for each product release
2CA116D4-CB9F-474B-A627-
2606ECC522AE
String
Building
25014
Glasshouse
25016
Road
Motorway
25710
Primary Road
25723
A Road
25729
B Road
25743
Minor Road
25750
Local Street
25760
Private Road Publicly Accessible
25780
Pedestrianised Street
25790
Motorway, Collapsed Dual Carriageway
25719
Primary Road, Collapsed Dual Carriageway
25735
A Road, Collapsed Dual Carriageway
25739
B Road, Collapsed Dual Carriageway
25749
Minor Road, Collapsed Dual Carriageway
25759
RoadTunnel
25792
MotorwayJunction
25796
Roundabout
Primary Road
25703
A Road
25704
B Road
25705
Minor Road
25706
Local Street
25707
Private Road Publicly Accessible
25708
SurfaceWater_Line
25600
SurfaceWater_Area
25609
TidalWater
High Water Mark
25608
TidalBoundary
High Water Mark Low Water Mark
25604
Low Water Mark
25605
Foreshore
25612
AdministrativeBoundary
National
25204
Parish Or Community
25200
District Or London Borough
25201
County Or Region Or Island
25202
RailwayTrack
Multi Track
25300
Single Track
25301
Narrow Gauge
25302
RailwayTunnel
25303
RailwayStation
Light Rapid Transit Station
25420
Railway Station
25422
London Underground Station
25423
Railway Station And London Underground Station
25424
Light Rapid Transit Station And Railway Station
25425
Light Rapid Transit Station And London Underground Station
25426
FunctionalSite
Education Facility - School
25250
Police Station
25251
Medical Care
25252
Place Of Worship
25253
Leisure Or Sports Centre
25254
Air Transport
25255
Education Facility - Higher
25256
Water Transport
25257
Road Transport
25258
Road Services
25259
Woodland
25999
Ornament
25550
ElectricityTransmissionLine
25102
NamedPlace
Populated Place
25801
Landform
25802
Woodland Or Forest
25803
Hydrography
25804
Landcover
25805
SpotHeight
25810