Abstract Class Name: Feature Topology

Superclass - SEDRIS Abstract Base

Subclasses

• Feature Edge
• Feature Face
• Feature Node

Definition

The objects that define both the geometric (i.e., location, shape) and topological (i.e., adjacency) aspects of Features, including Feature Nodes, Feature Edges, and Feature Faces. A topological surface consists of a collection of Feature Topology objects related to one another through a variety of topological relationships.

Primary Page in DRM Diagram:

• 12

Secondary Pages in DRM Diagram:

• 11

Example

1. In a collection of representing a transportation network, the Feature Faces representing built-up areas, airfields, railroad yards, and parking lots, the Feature Edges representing their boundaries as well as roads, railroads, runways, etc., and the Feature Nodes representing road intersections, railroad crossings, etc.

FAQs

Why is Feature Topology defined separately from Geometry Topology?

Feature Topology includes both the geometric and the topological aspects of Features, while Geometry Topology includes only the topological aspects of Geometry, which are completely optional.

Constraints

• No Attribute Conflicts
• Perimeter Related Feature Topology Partitioning

Composed of (one-way)

• optionally, a Feature ID
• optionally, some Property Values

Component of (two-way)

• optionally, some Union of Feature Topologies