ISO/IEC 18023-1:200x(E) — Table 6.180 DRM_Point

Table 6.180 — DRM_Point_Feature

Property

Description

Class

<DRM Point Feature>

Superclass

<DRM Primitive Feature>

Subclass

None.

Definition

An instance of this DRM class specifies a <DRM Primitive Feature> instance for which the spatial information needed for the representation can be abstracted to a single topologically significant location. This is sometimes referred to as a zero-dimensional location, since the topology associated with a <DRM Point Feature> instance does not provide length, width, or height information.

Class diagram

Figure 6.215 — DRM_Point_Feature

Inherited field elements

Field name	Range	Field data type
None

Field elements

Field name	Range	Field data type
None

Default field values

Default field values for DRM_Point_Feature

Associated to (one-way) (inherited)

zero or more <DRM Feature Representation> instances, each through the use of a <DRM Base Association Data> link object¹
zero or more <DRM Geometry Hierarchy> instances, each through the use of a <DRM Base Association Data> link object²
zero or more <DRM Property Grid> instances, each through the use of a <DRM Base Association Data> link object³

Associated to (one-way)

None.

Associated by (one-way) (inherited)

zero or more <DRM Feature Representation> instances, each through the use of a <DRM Base Association Data> link object⁴
zero or more <DRM Geometry Hierarchy> instances, each through the use of a <DRM Base Association Data> link object⁵
zero or more <DRM Property Grid> instances, each through the use of a <DRM Base Association Data> link object⁶

Associated by (one-way)

None.

Associated with (two-way) (inherited)

None.

Associated with (two-way)

one <DRM Feature Node> instance⁷

Composed of (two-way) (inherited)

zero or one <DRM Classification Data> instance
zero or more <DRM Label> instances
zero or more {ordered} <DRM Property Set Index> instances
zero or more <DRM Property Table> instances
zero or more <DRM Property Table Reference> instances
zero or more <DRM Property Value> instances
zero or one <DRM Rendering Priority Level> instance
zero or more <DRM Colour> instances
zero or more {ordered} <DRM Image Mapping Function> instances⁸
zero or one <DRM Presentation Domain> instance⁹
zero or one <DRM Spatial Extent> instance

Composed of (two-way)

None.

Composed of (two-way metadata) (inherited)

zero or one <DRM Data Quality> instance
zero or one <DRM Identification> instance
zero or one <DRM Time Constraints Data> instance

Composed of (two-way metadata)

None.

Component of (two-way) (inherited)

zero or more <DRM Union Of Features> instances

Component of (two-way)

None.

Constraints

Clarifications

¹An association between two <DRM Feature Representation> instances indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> link object on the association relationship.

²An association between a <DRM Geometry Hierarchy> instance and a <DRM Feature Representation> instance indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> link object on the association relationship.

³An association between a <DRM Property Grid> instance and a <DRM Feature Representation> instance indicates that the environmental object(s) represented by the <DRM Feature Representation> instance and the <DRM Property Grid> instance (or some specific cell data within that <DRM Property Grid> instance) have the semantic relationship indicated by the <DRM Base Association Data> link object on the association relationship. Each associated <DRM Property Grid> instance indicates whether the entire <DRM Property Grid> instance or only some specific cell data within it is participating in the relationship in question.

⁴An association between two <DRM Feature Representation> instances indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> link object on the association relationship.

⁵An association between a <DRM Geometry Hierarchy> instance and a <DRM Feature Representation> instance indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> link object on the association relationship.

⁶An association between a <DRM Property Grid> instance and a <DRM Feature Representation> instance indicates that the environmental object(s) represented by the <DRM Feature Representation> instance and the <DRM Property Grid> instance (or some specific cell data within that <DRM Property Grid> instance) have the semantic relationship indicated by the <DRM Base Association Data> link object on the association relationship. Each associated <DRM Property Grid> instance indicates whether the entire <DRM Property Grid> instance or only some specific cell data within it is participating in the relationship in question.

⁷The <DRM Feature Node> instance associated with a <DRM Point Feature> instance represents the topology of that <DRM Point Feature> instance.

⁸These components support attributes for derived objects; that is, they are used only to specify texture mapping information for geometry that is derived from the <DRM Primitive Feature> instance by the consumer. These <DRM Image Mapping Function> components shall use <DRM Image Anchor> components to specify the mapping.

⁹The <DRM Presentation Domain> component is needed because, in many cases, a <DRM Primitive Feature> instance may be significant only for a particular domain, such as radar.

Example(s)

Consider a well represented by a <DRM Point Feature> instance. The <DRM Point Feature> instance has a <DRM Classification Data> component classifying it as ECC_WELL, an associated <DRM Feature Node> instance specifying its location, and <DRM Property Value> components specifying its depth below the terrain surface and the potability of the water it contains.
Consider a road interchange represented as a <DRM Point Feature> instance. The <DRM Point Feature> instance has a <DRM Classification Data> component classifying it as ECC_ROAD_INTERCHANGE, and an associated <DRM Feature Node> instance specifying its location. In addition, the <DRM Feature Node> instance in this example is associated with some <DRM Feature Edge> instances that are part of the topology of some <DRM Linear Feature> instances representing the roads in question.
Consider a small building represented as a <DRM Point Feature> instance. The <DRM Point Feature> instance has a <DRM Feature Node> instance specifying its location, a <DRM Classification Data> component classifying it as ECC_BUILDING, and a set of <DRM Property Value> components that describe its characteristics, such as its EAC_HEIGHT and its EAC_BUILDING_FUNCTION.