Abstract Class Name: Primitive Feature

Superclass - <Feature Representation>

Subclasses

• <Areal Feature>
• <Linear Feature>
• <Point Feature>
• <Volumetric Feature>

Definition

An instance of a concrete class derived from this DRM class is a <Feature Representation> instance that is not hierarchically structured.

Primary Page in DRM Diagram:

• 8

Secondary Pages in DRM Diagram:

• 23

Example

See individual subclasses for examples.

FAQs

What determines whether a <Feature Representation> is represented as a <Point Feature>, a <Linear Feature>, or an <Areal Feature>?

This is primarily determined by the dimensions of the <Feature Representation>, in conjunction with the nature of the <Feature Representation>, the resolution of the source imagery from which the feature was extracted, and the intended use of the extracted feature data. A long, narrow feature will be extracted as a <Linear Feature>, representing the centreline of the actual feature, with a width field. A very small feature will be extracted as a <Point Feature>, with length and width fields, or possibly a radius field.

Constraints

• <<Publishable Object>>
• <<No Attribute Conflicts>>
• <<Non Crossing Aggregations>>
• <<Non Crossing Associations>>
• <<Precedence of Property Set Index>>
• <<Colour Mapping Restrictions>>
• <<Image Mapping Functions and Texture Coordinates>>

Associated to (one-way) (inherited)

• zero or more <Feature Representation> instances, each with a <Base Association Data> link object (notes)
• zero or more <Geometry Hierarchy> instances, each with a <Base Association Data> link object (notes)
• zero or more <Property Grid> instances, each with a <Base Association Data> link object (notes)

Associated by (one-way) (inherited)

• zero or more <Feature Representation> instances, each with a <Base Association Data> link object (notes)
• zero or more <Geometry Hierarchy> instances, each with a <Base Association Data> link object (notes)
• zero or more <Property Grid> instances, each with a <Base Association Data> link object (notes)

Composed of (two-way) (inherited)

• zero or one <Classification Data> instance
• zero or more <Label> instances
• zero or more {ordered} <Property Set Index> instances
• zero or more <Property Table> instances
• zero or more <Property Table Reference> instances
• zero or more <Property Value> instances
• zero or one <Rendering Priority Level> instance

Composed of (two-way)

• zero or more <Colour> instances
• zero or more {ordered} <Image Mapping Function> instances (notes)
• zero or one <Presentation Domain> instance (notes)
• zero or one <Spatial Extent> instance

Composed of (two-way metadata) (inherited)

• zero or one <Access> instance
• zero or more <Cross Reference> instances
• zero or one <Data Quality> instance
• zero or one <Description> instance
• zero or one <Time Constraints Data> instance

Component of (two-way) (inherited)

• zero or more <Union Of Features> instances

Inherited Field Elements

Notes

Associated to Notes

Feature_Representation

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

Geometry_Hierarchy

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

Property_Grid

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

Associated from Notes

Feature_Representation

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

Geometry_Hierarchy

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

Property_Grid

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

Composed of Notes

Image_Mapping_Function

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

Presentation_Domain

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