ISO/IEC 18023-1:200x(E) — Table 6.175 DRM_Point

Table 6.175 — 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> 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> does not provide length, width, or height information.

Class diagram

Figure 6.201 — DRM_Point_Feature

Inherited field elements

Field name	Range	Field data type
None

Field elements

Field name	Range	Field data type
None

Associated to (one-way) (inherited)

None.

Associated to (one-way)

None.

Associated by (one-way) (inherited)

None.

Associated by (one-way)

None.

Associated with (two-way) (inherited)

zero or more <DRM Feature> instances¹
zero or more <DRM Geometry Hierarchy> instances²
zero or more <DRM Property Grid> instances³

Associated with (two-way)

one <DRM Feature Node> instance⁴

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> instances⁵
zero or one <DRM Presentation Domain> instance⁶
zero or one <DRM Spatial Extent> instance

Composed of (two-way metadata) (inherited)

zero or one <DRM Access> instance
zero or more <DRM Cross Reference> instances
zero or one <DRM Data Quality> instance
zero or one <DRM Description> 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

¹ An association between two <DRM Feature> instances indicates that they are alternate representations of the same environmental object.

² An association between a <DRM Geometry Hierarchy> instance and a <DRM Feature> instance indicates that the <DRM Geometry Hierarchy> and the <DRM Feature> are alternate representations of the same environmental object.

³ An association between a <DRM Property Grid> instance and a <DRM Feature> instance indicates that the <DRM Feature> and the <DRM Property Grid> (or some specific cell data within that <DRM Property Grid>) are alternate representations of the same environmental object. Each associated <DRM Property Grid> will indicate which is the case.

⁴ The <DRM Feature Node> associated with a <DRM Point Feature> instance represents the topology of that <DRM Point Feature>.

⁵ These 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> by the consumer. These <DRM Image Mapping Function> components shall use <DRM Image Anchor> components to specify the mapping.

⁶ This is needed because in many cases, a <DRM Primitive Feature> may be significant only for a particular domain, such as radar.

Example(s)

Consider a well represented a <DRM Point Feature>. The <DRM Point Feature> has a <DRM Classification Data> classifying it as a well, an associated <DRM Feature Node> 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>. The <DRM Point Feature> has a <DRM Classification Data> classifying it as ECC_ROAD_INTERCHANGE, and an associated <DRM Feature Node> specifying its location. In addition, the <DRM Feature Node> 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>. It has a <DRM Feature Node> that defines its location, <DRM Classification Data> that identifies it as a building, and a set of <DRM Property Value> components that describe its characteristics, such as its height and its building functional category.