Table 6.162—DRM_Linear_Feature

Property

Description

Superclass

·         <DRM Primitive Feature>

Class

·         <DRM Linear Feature>

Subclass

·         none

Definition

An object of this DRM class defines a <DRM Primitive Feature> with a one-dimensional structure, such as a road, a stream, or a power line.

Example(s)

·         Consider a <DRM Linear Feature> representing a road:

Linear Feature, Example 1

This <DRM Linear Feature> instance has an ordered set of <DRM Feature Edge> defining the 2D or 3D path of its centreline. The <DRM Classification Data> identifies it as a road, while the <DRM Property Value> instances describe the characteristics of the road.

Note that if individual segments of the road had different surface characteristics, they could have been attributed with their own <DRM Property Value> components.

Inherited field elements

field_name

range

Field_Data_Type

none

 

 

Field elements

field_name

range

Field_Data_Type

none

 

 

Associated to (one-way) (inherited)

·         none

Associated to (one-way)

·         none

Associated by (one-way) (inherited)

·         none

Associated by (one-way)

·         none

Associated with (two-way) (inherited)

·         zero or more <DRM Feature>

·         zero or more <DRM Geometry Hierarchy>s

·         zero or more <DRM Property Grid>s

Associated with (two-way)

·         one or more {ordered} <DRM Feature Edge>s through <DRM Edge Direction>s

Composed of (two-way) (inherited)

·         zero or more {ordered} <DRM Attribute Set Index>s

·         zero or one <DRM Classification Data>

·         zero or more <DRM Colour>

·         zero or more {ordered} <DRM Image Mapping Function>s1

·         zero or more <DRM Label>s

·         zero or one <DRM Point Of Contact>

·         zero or one <DRM Presentation Domain>2

·         zero or more <DRM Property Table>s

·         zero or more <DRM Property Table Reference>s

·         zero or more <DRM Property Value>

·         zero or one <DRM Rendering Priority Level>

·         zero or one <DRM Spatial Domain>

·         zero or one <DRM Time Constraints Data>

Composed of (two-way)

·         none

Composed of (two-way metadata) (inherited)

·         zero or one <DRM Access>

·         zero or more <DRM Browse Media>s

·         zero or one <DRM Citation>

·         zero or more <DRM Cross Reference>s

·         zero or one <DRM Data Quality>

·         zero or one <DRM Description>

·         zero or one <DRM Keywords>

·         zero or one <DRM Point Of Contact>

Composed of (two-way metadata)

·         none

Component of (two-way) (inherited)

·         zero or more <DRM Union Of Features>s

Component of (two-way)

·         none

Constraints

·         Colour mapping restrictions

·         Image mapping functions and texture coordinates

·         No attribute conflicts

·         Non-crossing aggregations

·         Non-crossing associations

·         Precedence of Attribute_Set_Index

Notes

1 These components are used only to specify texture mapping information for geometry that is derived from the <DRM Feature> by the consumer. These <DRM Image Mapping Function> shall use <DRM Image Anchor> components to specify the mapping.

2 This is needed because in many cases, a <Primitive Feature> may be significant only for a particular domain, e.g. radar.

Class diagram

<DRM Linear Feature>