Class Name: Linear Feature

Superclass - Primitive Feature

Definition

A Primitive Feature with a one-dimensional structure, such as a road, a stream, or a power line.

Primary Page in DRM Diagram:

• 8

Example

1. A road might be represented as a Linear Feature. It has an ordered set of one or more Feature Edges that define the 2D or 3D path of its centerline, a Classification Data object that identifies it as a road, Property Values that describe its characteristics, such as width (EDCS_AC_WIDTH) and road surface type ( EDCS_AC_ROAD_OR_RUNWAY_SURFACE_TYPE), and a Label that identifies it as "Interstate 5".

FAQs

Can a Linear Feature consist of multiple Feature Edges?

Yes, a Linear Feature can consist of multiple Feature Edges. However, these Feature Edges must form an ordered sequence, such that each consecutive pair of Feature Edges share a common Feature Node. Also, any properties of the feature must remain the same throughout its length. For example, a single road feature (Interstate 95) could conceivably consist of a linear sequence of hundreds or thousands of Feature Edges.

Constraints

• Image Mapping Functions and Texture Coordinates
• No Attribute Conflicts
• Non Crossing Aggregations
• Non Crossing Associations
• Precedence of Attribute Set Index

Associated with (two-way)(inherited)

• optionally, some Features
• optionally, some Geometry Hierarchies
• optionally, some Property Grids

Composed of (one-way)(inherited)

• optionally, some {ordered} Attribute Set Indices
• optionally, a Classification Data
• optionally, some Colors
• optionally, some {ordered} Image Mapping Functions (notes)
• optionally, some Labels
• optionally, some Property Tables
• optionally, some Property Table References
• optionally, some Property Values
• optionally, a Rendering Priority Level
• optionally, a Spatial Domain

Composed of (two-way)

• one or more {ordered} Feature Edges through Feature Edge Directions

Composed of (one-way metadata)(inherited)

• optionally, an Access
• optionally, some Browse Graphics
• optionally, some Cross References
• optionally, a Data Quality
• optionally, a Keywords
• optionally, a Point of Contact
• optionally, a Time Constraints Data

Component of (two-way)(inherited)

• optionally, some Union of Features

Notes

Composed of Notes

Image_Mapping_Function

 Added to support "attributes for derived objects."
 That is, these components are used only to specify
 texture mapping information for geometry that
 is derived from the <Feature> by the consumer.
 These <Image Mapping Functions> must use
 <Image Anchor> components to specify the mapping.