Table 6.82 — DRM_Feature_Representation

Property

Description

Class
  • <DRM Feature Representation>

Superclass

Subclass

Definition

An instance of a concrete class derived from this DRM class represents an entity in the environment (or a hierarchical collection of such entities) so as to abstract away all spatial information that is not needed to reason about that entity in terms of its spatial connectivity

Clarifications

1 An 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> instance on the association relationship.

2 An 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> instance on the association relationship.

3 An 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> instance on the association relationship. Each associated <DRM Property Grid> instance will indicate whether the entire <DRM Property Grid> instance or only some specific cell data within it is participating in the relationship in question.

4 An 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> instance on the association relationship.

5 An 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> instance on the association relationship.

6 An 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> instance on the association relationship. Each associated <DRM Property Grid> instance will indicate whether the entire <DRM Property Grid> instance or only some specific cell data within it is participating in the relationship in question.

Class diagram

Figure 6.94 — DRM_Feature_Representation

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)

Associated by (one-way) (inherited)
  • None.

Associated by (one-way)

Associated with (two-way) (inherited)
  • None.

Associated with (two-way)
  • None.

Composed of (two-way) (inherited)
  • None.

Composed of (two-way)

Composed of (two-way metadata) (inherited)
  • None.

Composed of (two-way metadata)

Component of (two-way) (inherited)
  • None.

Component of (two-way)

Constraints

Example(s)

  • A wide variety of spatially located entities, including roads, railroads, streams, rivers, lakes, bridges, buildings, built-up areas, forests, fields, political boundaries, powerlines, airfields, and so on can be abstractly represented as <DRM Feature Representation> instances. <DRM Feature Representation> instances may be organized into thematic layers, each forming a separate topological surface.