The SEDRIS Data Representation Model
APPENDIX A - Classes
Volumetric Feature

Class Name: Volumetric Feature

Superclass - <Primitive Feature>

Subclasses

This DRM class is concrete and has no subclasses.

Definition

An instance of this DRM class is a <Primitive Feature> instance that encloses a bounded region of three-dimensional space.

Primary Page in DRM Diagram:

Secondary Pages in DRM Diagram:

Example

  1. Consider a <Volumetric Feature> instance representing a building. It has:

    1. an associated <Feature Volume> instance, which defines its extent, shape, and topological relationships;
    2. a <Classification Data> component that classifies it as an ECC_BUILDING;
    3. <Property Value> components that describe its characteristics, such as material composition; and
    4. a <Label> instance that identifies it as "The Empire State Building".

    This is depicted in Figure 6.76:

    Volumetric Feature, Example 1

    Figure 76 — <DRM Volumetric Feature> example

FAQs

Is Level 5 feature topology required in order for <Volumetric Feature> instances to exist?

No. In order for <Volumetric Feature> instances to exist, the SRF must be three-dimensional, and at least one <Feature Volume> instance must exist.

Can the topology of a <Volumetric Feature> instance consist of multiple <Feature Volume> instances? If so, are these <Feature Volume> instances required to be adjacent or connected to one another?

The topology of a <Volumetric Feature> instance can consist of multiple <Feature Volume> instances. There is no requirement that these <Feature Volume> instances be adjacent or connected to one another. For example, a house with a detached garage could be represented as a single <Volumetric Feature> instance with two associated <Feature Volume> instances (one for the house itself, and one for the garage).

Constraints

Associated to (one-way) (inherited)

Associated by (one-way) (inherited)

Associated with (two-way)

Composed of (two-way) (inherited)

Composed of (two-way metadata) (inherited)

Component of (two-way) (inherited)

Inherited Field Elements

This class has no 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> link object 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> link object 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> link object on the association relationship. Each associated <Property Grid> instance indicates 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> link object 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> link object 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> link object on the association relationship. Each associated <Property Grid> instance indicates 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> instance by the consumer. These <Image Mapping Function> components shall use <Image Anchor> components to specify the mapping.


Presentation_Domain

The <Presentation Domain> component is needed because, in many cases, a <Primitive Feature> instance may be significant only for a particular domain, such as radar.

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Last updated: July 26, 2006 Copyright © 2006 SEDRIS™