Water
Polygon feature representing an area of permanent inland water.
The OS NGD Water Features Collection contains both a Water Feature Type and Water Point Feature Type. Within the Water Feature Type, inland water is represented as polygons, whereas in Water Point Feature Type, inland water is represented as points. To be captured as a polygon, an area of permanent inland water generally has to have a minimum size of 8 sq m. Areas of permanent inland water below this minimum size but which OS consider to be of sufficient interest to be captured are captured as points.
Temporal filtering
The earliest and latest dates on which you can request a one-off snapshot of a date in the past for the data schema versions available for this feature type are detailed in the following table:
| Data schema version | Earliest date | Latest date |
|---|---|---|
1.0 | 29 September 2022 | Ongoing |
2.0 | 27 March 2024 | Ongoing |
Feature type attributes
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.
osid
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, 2.0
toid
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, 2.0
versiondate
Date on which 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, 2.0
versionavailablefromdate
The date on which 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, 2.0
versionavailabletodate
The date on which this version of the feature was superseded by an update or ceased to exist.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, 2.0
firstdigitalcapturedate
The date on which a feature was first digitised by Ordnance Survey.
Data Types: String (GeoJSON), Date (GPKG), Date (CSV)
Nullable: true
OS NGD API – Features Filterable: No
OS Select+Build Filterable: Yes
Data Schema Version: 1.0, 2.0
changetype
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, 2.0
geometry
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, 2.0
Geometry Type: Polygon
geometry_area
The measured area of the geometry in square 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
🆕geometry_area_m2
The measured area of the geometry in square metres.
Data Types: Number (GeoJSON), Float (GPKG), Real (CSV)
Nullable: false
Precision: 15
Scale: 3
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: No
Data Schema Version: 2.0
geometry_evidencedate
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 the date information was received from a third party.
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, 2.0
geometry_updatedate
The date on which 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, 2.0
geometry_source
The source organisation that 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
🆕geometry_capturemethod
Indication of the method used to capture or produce the data.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: capturemethodvalue
Max Length: 25
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 2.0
theme
The OS NGD theme to which this feature belongs.
Data Types: Array (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, 2.0
description
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: waterdescriptionvalue
Max Length: 50
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: Yes
Data Schema Version: 1.0, 2.0
description_evidencedate
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 the date information was received from a third party.
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, 2.0
description_updatedate
Date on which 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, 2.0
description_source
The source organisation that 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
🆕description_capturemethod
Indication of the method used to capture or produce the data.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: capturemethodvalue
Max Length:
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 2.0
oslandcovertiera
A high-level description of the land cover, more detail is provided in the OSLandCoverTierB attribute.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: wateroslandcovertieravalue
Max Length: 25
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: Yes
Data Schema Version: 1.0, 2.0
oslandcovertierb
A detailed description of the land cover type. Up to five distinct land cover types can be applied.
Please note: The max length specified below is the maximum length of 1 permissible value. This attribute can have up to 5 permissible values.
Data Types: Array (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: wateroslandcovertierbvalue
Max Length: 125
Multiplicity: [1..5]
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: No
Data Schema Version: 1.0, 2.0
oslandcover_evidencedate
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 the date information was received from a third party.
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
🆕oslandcover_updatedate
Date on which 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, 2.0
oslandcover_source
The organisation that provided the information.
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
🆕 oslandcover_capturemethod
Indication of the method used to capture or produce the data.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: capturemethodvalue
Max Length: 25
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: Yes
Data Schema Version: 2.0
oslandusetiera
A high-level description of the main activity that takes place at the location or that the feature supports.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: oslandusetieravalue
Max Length: 50
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: Yes
Data Schema Version: 1.0, 2.0
oslandusetierb
A detailed description of the main activity that takes place at the location or that the feature supports.
Please note: The max length specified below is the maximum length of 1 permissible value. This attribute can have up to 2 permissible values.
Data Types: Array (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Code List Name: oslandusetierbvalue
Max Length: 50
Multiplicity: [0..2]
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: No
Data Schema Version: 1.0, 2.0
oslanduse_evidencedate
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 the date information was received from a third party.
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, 2.0
oslanduse_updatedate
Date on which 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, 2.0
oslanduse_source
The organisation that provided the information.
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
🆕 oslanduse_capturemethod
Indication of the method used to capture or produce the data.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: capturemethodvalue
Max Length: 25
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 2.0
watertype
An indicator whether an area of water is normally tidal
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: watertypevalue
Max Length: 10
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: Yes
Data Schema Version: 1.0, 2.0
associatedstructure
Indicates whether the feature is part of a larger structure and the nature of the structure, for example, a dam, bridge or breakwater.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Code List Name: compoundstructuredescriptionvalue
Max Length: 25
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0, 2.0
operationalstatus
An indicator of whether the feature is currently performing its original function.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: operationalstatusvalue
Max Length: 10
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: Yes
Data Schema Version: 1.0, 2.0
isobscured
An indicator that the feature is at ground level but lies below another feature represented in the data. For example, a road with a bridge over it will have the attribute set to 'True'.
Data Types: Boolean (GeoJSON), Integer (GPKG), String (CSV)
Nullable: false
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0, 2.0
physicallevel
The relative relationship of the feature to ground surface level, where ground surface level is the lowest identifiable level that is not underground.
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, 2.0
capturespecification
Indicates the capture specification used by OS when capturing the feature. This could be Urban, Rural or Moorland.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: capturespecificationvalue
Max Length: 10
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0, 2.0
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