Class Name: Feature Model Instance

Superclass - <Feature Hierarchy>

Subclasses

Definition

An instance of this DRM class specifies a single case of the existence of a <Feature Model> within a given transmittal, including variations or specialization unique to that case.

Primary Page in DRM Diagram:

• 7

Secondary Pages in DRM Diagram:

• 2
• 8
• 16

Example

1. Consider a <Model> instance representing a forested area, consisting of a <Geometry Model> instance describing its renderable geometry and a <Feature Model> instance describing it in terms of a collection of <Areal Feature> instances. The <Geometry Model> instance's <Geometry Hierarchy> and the <Feature Model>'s component <Union Of Features> are connected by an association relationship, to indicate that they are alternate representations of the same entity.

   Wherever the <Model> is to be instanced, a <Feature Model Instance> instance will be placed, with the appropriate <Transformation> instance to locate it in space and any <Expression> instances required for <Variable> instances within the <Feature Model>.

FAQs

Where can users find further information on feature topology in SEDRIS?

See Part 4, Volume 4 Topology Technical Guide of the SEDRIS Documentation Set for further information.

Constraints

• <<Publishable Object>>
• <<No Attribute Conflicts>>
• <<Non Crossing Aggregations>>
• <<Non Crossing Associations>>
• <<Precedence of Property Set Index>>
• <<Non Cyclic Aggregations>>
• <<Distinct Link Objects>>
• <<Model Spatial Reference Frame>>

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 to (one-way)

• one <Feature Model> instance

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)
• zero or one <Hierarchy Summary Item> instance

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
• zero or one <Reference Surface> instance
• zero or more <Sound Instance> instances

Composed of (two-way)

• zero or more <Expression> instances, each with a <Model Instance Template Indices> link object
• zero or one <Transformation> instance (notes)

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
• zero or more <Alternate Hierarchy Related Features> instances, each with a <Hierarchy Data> link object
• zero or more <Classification Related Features> instances, each with a <Classification Data> link object
• zero or one <Environment Root> instance
• zero or one <Feature Model> instance
• zero or more <LOD Related Features> instances, each with a <Base LOD Data> link object
• zero or more <Octant Related Features> instances, each with a <Octant Data> link object
• zero or more <Perimeter Related Features> instances, each with a <Perimeter Data> link object
• zero or more <Quadrant Related Features> instances, each with a <Quadrant Data> link object
• zero or more <Spatial Index Related Features> instances, each with a <Spatial Index Data> link object
• zero or more <State Related Features> instances, each with a <State Data> link object
• zero or more <Time Related Features> instances, each with a <Time Constraints Data> link object

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

Transformation

 This positions and orients the <Feature Model Instance> in the
 target SRF.