The SEDRIS Data Representation Model
APPENDIX A - Classes
Feature Topology

Abstract Class Name: Feature Topology

Superclass - <SEDRIS Abstract Base>

Subclasses

Definition

An instance of this DRM class specifies both the geometric aspects (such as location and shape) and topological aspects (such as adjacency) of part of one or more <Feature Representation> instances.

Primary Page in DRM Diagram:

Secondary Pages in DRM Diagram:

Example

  1. In a collection of <Feature Representation> instances representing a transportation network, the <Feature Face> instances represent built-up areas, airfields, railroad yards, and parking lots, the <Feature Edge> instances represent their boundaries as well as roads, railroads, and runways, and the <Feature Node> instances represent road intersections and railroad crossings.

FAQs

Why is <Feature Topology> defined separately from <Geometry Topology>?

<Feature Topology> includes both the geometric and the topological aspects of <Feature Representation> instances, while <Geometry Topology> includes only the topological aspects of <Geometry Representation>, which are completely optional.

Constraints

Composed of (two-way)

Component of (two-way)

Inherited Field Elements

This class has no inherited field elements.
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Last updated: July 26, 2006 Copyright © 2006 SEDRIS