This section describes the structured data types which make up OS MasterMap Network - Water Layer. The attributes associated with these data 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.
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.
‘0..1’ – population is optional but a maximum of one attribute will be returned These values may be used in combination.
The pointReference data types will be used to record interactions at points on the WatercourseLink (interactions with a length of less than 2 m). For example, point interactions could be used to record the presence and position of features such as sluices.
Reference to specific point on a WatercourseLink at which a specific property applies.
Subtype of: SimplePointReference
Point geometry to explicitly locate where on the WatercourseLink the property applies.
Attribute name: atPositionGeometry
Type: GM_Point
Multiplicity: [1]
The linearReference data type will be used where required to record interaction over a length of a WatercourseLink. For example, linear interactions could be used to record where the water network passes under the bridge for a distance at A, over a weir at B or has an associated fish pass at an offset at C.
Where a linear interaction applies to two or more links, then each part of the interaction is recorded by means of more than one networkReference property.
Reference to a part of a WatercourseLink along which a specific property applies.
Subtype of: SimpleLinearReference
Point geometry to explicitly locate the start location from which the property applies.
Attribute name: fromPositionGeometry
Type: GM_Point
Multiplicity: [1]
Point geometry to explicitly locate the end location to which the property applies.
Attribute name: toPositionGeometry
Type: GM_Point
Multiplicity: [1]
