Water Link
Last updated
Last updated
A network representation of the general alignment and connectivity of permanent water, including rivers, lakes, and canals.
The earliest date on which you can request a one-off snapshot of a date in the past for data in this feature type is 29 September 2022.
The following sub-sections provide details about the attributes included with this feature type, their data types in the different output formats, and other important metadata about them.
Primary identifier for the feature. The OSID is a Globally Unique Identifier (GUID) and requires no centralised authority to ensure uniqueness. Note that the same OSID can occur in more than one feature type when a single feature is represented multiple times in the OS NGD.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Max Length: 36
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: No
Data Schema Version: 1.0
Topographic identifier (TOID) of the feature, as published in the OS MasterMap suite of products.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 20
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: No
Data Schema Version: 1.0
Date when the version was last updated.
Data Types: String (GeoJSON), Date (GPKG), Date (CSV)
Nullable: false
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The date this version of the feature became the latest version.
Data Types: String (GeoJSON), DateTime (GPKG), DateTime (CSV)
Nullable: false
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The date this version of the feature was superseded by an update or ceased to exist.
Data Types: String (GeoJSON), DateTime (GPKG), DateTime (CSV)
Nullable: true
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The type of change that generated a new version of the feature.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: changetypevalue
Max Length: 50
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
3D geometry for the feature.
Data Types: Geometry (GeoJSON), Geometry (GPKG), WKT (CSV)
Nullable: false
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
Geometry Type: LineString
The measured length of the geometry in metres.
Data Types: Number (GeoJSON), Float (GPKG), Real (CSV)
Nullable: false
Precision: 15
Scale: 6
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: No
Data Schema Version: 1.0
The date on which the latest evidence was gathered to make an update if required. For example the date of collection by a surveyor or third party information received.
Data Types: String (GeoJSON), Date (GPKG), Date (CSV)
Nullable: true
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
Date when the attribute was last updated.
Data Types: String (GeoJSON), Date (GPKG), Date (CSV)
Nullable: false
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The source organisation who provided the data.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Code List Name: waterlinkgeometrysourcevalue
Max Length: 50
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The OS NGD theme to which this feature belongs.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: themevalue
Max Length: 40
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
A single descriptive value intended for a quick understanding of what the feature represents.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: waterlinkdescriptionvalue
Max Length: 12
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: Yes
Data Schema Version: 1.0
The date on which the latest evidence was gathered to make an update if required. For example the date of collection by a surveyor or third party information received.
Data Types: String (GeoJSON), Date (GPKG), Date (CSV)
Nullable: true
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
Date when the attribute was last updated.
Data Types: String (GeoJSON), Date (GPKG), Date (CSV)
Nullable: false
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The source organisation who provided the data.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 50
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
Value indicating the relative importance of the water network link within any larger watercourse it is part of.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: waterlinkprimacyvalue
Max Length: 1
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
Expresses whether the water network link represents inland or tidal water.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: waterlinkwatertypevalue
Max Length: 6
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The physical level of the feature, for example 'Surface Level' or 'Level 1' if it is on a supported structure.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: physicallevelvalue
Max Length: 15
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
Value indicating whether the water network link in contained in a culvert, tunnel or natural subterranean passage.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: waterlinkphysicalcontainmentvalue
Max Length: 31
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
Direction of water flow in the segment relative to digitisation of segment geometry.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: waterlinkflowdirectionvalue
Max Length: 12
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
Describes if the watercourse contains water year round (in normal conditions) or only contains water intermittently. For example, a flood relief channel would be considered to be Intermittent.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: waterlinkpermanencevalue
Max Length: 12
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
Indicates the capture specification used by OS when capturing the feature. This could either be Urban, Rural or Moorland.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Code List Name: capturespecificationvalue
Max Length: 10
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
A calculated value indicating the relative cartographic importance of a Water Link to aid selection and depiction when styling the data.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Code List Name: waterlinklevelofdetailvalue
Max Length: 8
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The name of the catchment area where the WaterLink falls, assigned by a responsible body. The responsible bodies are Environment Agency for England, Scottish Environmental Protection Agency for Scotland, and Natural Resources Wales for Wales. In rare cases where the WaterLink falls inside more than one catchment or is not inside any catchment (for example in the sea), the catchmentName is set to null.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 254
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: Yes
Data Schema Version: 1.0
The code of the catchment area where the WaterLink falls, assigned by a responsible body. The responsible bodies are Environment Agency for England. Scottish Environmental Protection Agency for Scotland and Natural Resources Wales for Wales. In rare cases where the WaterLink is in more than one catchment or is not inside any catchment (for example in the sea), the catchmentID is set to null.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 20
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: Yes
Data Schema Version: 1.0
The average width of the watercourse along the WaterLink expressed in metres. For WaterLink features derived from Ordnance Survey large scale single line features, the width is currently set to null.
Data Types: Number (GeoJSON), Float (GPKG), Real (CSV)
Nullable: true
Precision: 7
Scale: 2
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: No
Data Schema Version: 1.0
A calculated percentage value that indicates the rate of descent of the surface of the water. The gradient is derived by dividing the Vertical Drop by the Length of the link and multiplying by 100. NOTE: where the gradient does not correlate with the flow, this value is set to null.
Data Types: Number (GeoJSON), Float (GPKG), Real (CSV)
Nullable: true
Precision: 5
Scale: 2
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: No
Data Schema Version: 1.0
The Water Node coincident with the first vertex for this Water Link.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Max Length: 36
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The Water Node coincident with the last vertex for this Water Link.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Max Length: 36
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The identifier of the name of the Water Link used to differentiate between features with the same name.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 36
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: No
Data Schema Version: 1.0
Name assigned to identify the feature.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 254
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: No
Data Schema Version: 1.0
The language of name1, provided as a 3-digit ISO 639-2 code ('eng, 'cym', 'gla').
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Code List Name: languagevalue
Max Length: 3
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The alternative language name assigned to identify the feature.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 254
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: No
Data Schema Version: 1.0
The language of name2, provided as a 3-digit ISO 639-2 code ('eng, 'cym', 'gla').
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Code List Name: languagevalue
Max Length: 3
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The identifier of the secondary name of the Water Link used to differentiate between features with the same name.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 36
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The name of a sub-section of the feature, normally representing a named stretch of water or pool.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 254
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The language of nameSecondary1, provided as a 3-digit ISO 639-2 code ('eng, 'cym', 'gla').
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Code List Name: languagevalue
Max Length: 3
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The language alternative name of a sub-section of the feature.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 254
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The language of nameSecondary2, provided as a 3-digit ISO 639-2 code ('eng, 'cym', 'gla').
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Code List Name: languagevalue
Max Length: 3
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The identifier of the tertiary name of the Water Link used to differentiate between features with the same name.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 36
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The name of a smaller sub-section of the feature, normally representing a named stretch of water or pool.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 254
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The language of nameTertiary2, provided as a 3-digit ISO 639-2 code ('eng, 'cym', 'gla').
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Code List Name: languagevalue
Max Length: 3
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The language alternative name of the smaller sub-section of the feature.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 254
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
The language of nameTertiary2, provided as a 3-digit ISO 639-2 code ('eng, 'cym', 'gla').
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Code List Name: languagevalue
Max Length: 3
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
