HydroNode

HydroNode features explicitly represent the starts, ends and junctions of watercourses, and places where certain attribution changes. They only exist at the end points of the WatercourseLink features. HydroNode positions are provided in 3D. The vertical coordinate has been sourced from Ordnance Survey terrain data.

HydroNode attributes

A feature at the end of one or more WatercourseLink features that indicates the confluence of two or more watercourses and / or a change in attribution of the connected WatercourseLink features.

• Subtype of: HydroNode

Attribute naming across formats

Attribute names will vary slightly depending on what format you receive your data in (GML, GeoPackage or vector tiles). The attribute names on the feature type pages are written as they will appear in GML format. Attribute name mapping tables between GML and the other two formats for each feature type are present in the following pages:

• GeoPackage overview

• Vector tiles overview

gml:id

Unique identifier. For WatercourseLink this is a TOID.

• Attribute name: gml:id (GML), toid (GeoPackage), toid (VectorTile)

• Type: CharacterString

• Length: 20

• Multiplicity: [1]

reasonForChange

The cause of the creation of the current version of the feature.

• Attribute name: reasonForChange

• Type: ReasonForChangeValue

• Multiplicity: [1]

geometry

The location of the HydroNode.

• Attribute name: geometry

• Type: GM_Point

• Multiplicity: [1]

inspireId

External object identifier of the spatial object.

Note 1: The localId contains the Ordnance Survey TOID.

Note 2: An external object identifier is a unique object identifier published by the responsible body, which may be used by external applications to reference the spatial object. The identifier is an identifier of the spatial object, not an identifier of the real-world phenomenon.

• Attribute name: inspireId

versionId «lifeCycleInfo»

The identifier of the particular version of the spatial object, with a maximum length of 25 characters. If the specification of a spatial object type with an external object identifier includes life-cycle information, the version identifier is used to distinguish between the different versions of a spatial object. Within the set of all versions of a spatial object, the version identifier is unique.

• Attribute name: versionId

• Type: CharacterString

• Multiplicity: [0..1]

beginLifespanVersion «lifeCycleInfo»

Date and time at which this version of the spatial object was inserted or changed in the spatial data set.

This is equivalent to ‘versionDate’ in other OS MasterMap products.

• Attribute name: beginLifespanVersion

• Type: DateTime

• Multiplicity: [1]

hydroNodeCategory «voidable»

Nature of the HydroNode.

• Attribute name: hydroNodeCategory

• Type: HydroNodeCategoryValue

• Multiplicity: [1]