ISO/IEC 18023-1:200x(E) — Table 6.137 DRM_Linear

Table 6.137 — DRM_Linear_Feature

Property

Description

Class

<DRM Linear Feature>

Superclass

<DRM Primitive Feature>

Subclass

None.

Definition

An instance of this DRM class is a <DRM Primitive Feature> with a one-dimensional structure, such as a road, a stream, or a power line.

Class diagram

Figure 6.159 — DRM_Linear_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 or more {ordered} <DRM Feature Edge> instances, each with a <DRM Edge Direction> link object

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> instances⁴
zero or one <DRM Presentation Domain> instance⁵
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 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.

⁵ 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 <DRM Linear Feature> representing a road.

Figure 6.160 — <DRM Linear Feature> example

This <DRM Linear Feature> instance has an ordered set of <DRM Feature Edge> instances defining the 2D or 3D path of its centreline. The <DRM Classification Data> identifies it as a road, while the <DRM Property Value> instances describe the characteristics of the road.
Note that if individual segments of the road had different surface characteristics, they could have been attributed with their own <DRM Property Value> components.