Abstract Class Name: Primitive Feature

Superclass - Feature

Subclasses

• Areal Feature
• Linear Feature
• Point Feature

Definition

A Feature that is not hierarchically structured, i.e., a Point Feature, Linear Feature, or Areal Feature.

Primary Page in DRM Diagram:

• 8

Example

1. Depending on its dimensions, a building might be represented as either a Point Feature, a Linear Feature, or an Areal Feature. Regardless, it would have a Classification Data object that identifies it as a building, and a set of Property Values that describe its characteristics, such as height ( EDCS_AC_HEIGHT_ABOVE_SURFACE_LEVEL) and building functional category ( EDCS_AC_BUILDING_FUNCTION_CATEGORY).

FAQs

What determines whether a Feature is represented as a Point Feature, a Linear Feature, or an Areal Feature?

This is primarily determined by the dimensions of the feature, in conjunction with the nature of the feature, the resolution of the source imagery from which the feature was extracted, and the intended use of the extracted feature data. A long, narrow feature will be extracted as a Linear Feature, representing the centerline of the actual feature, with a width field. A very small feature will be extracted as a Point Feature, with length and width fields, or possibly a radius field.

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 (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.