Table 6.225—DRM_Quad_Tree_Related_Features

Property

Description

Superclass

· <DRM Aggregate Feature>

Class

· <DRM Quad Tree Related Features>

Subclass

· none

Definition

An object of this DRM class specifies an aggregation of <DRM Feature Hierarchy>s in which each component <DRM Feature Hierarchy> represents a branch of a quad_tree. The quadrant represented by a branch is specified by the <DRM Quad Tree Data> associated with that branch. The bounding region that the <DRM Feature Hierarchy> components occupy is defined by the <DRM Spatial Domain> of the <DRM Quad Tree Related Features>.

Example(s)

· Consider a region of terrain that is organized into quadrants, where the upper-right quadrant consists of ocean, and the other three quadrants consist of the terrain bordering the ocean. The ocean quadrant is not represented in the producer's system. The region is represented in SEDRIS by a <DRM Quad Tree Related Features> with 3 component <DRM Union Of Features>. (Since the remaining quadrant had no <DRM Feature>s, it was not represented.)

· Consider a <DRM Quad Tree Related Features> linked to a <DRM Union Of Features> representing its upper-right quadrant, via a <DRM Quad Tree Data>. The <DRM Quad Tree Data>'s quadrant value is NORTHEAST.

Inherited field elements

field_name	range	Field_Data_Type
unique_descendants^1		Boolean
strict_organizing_principle^2		Boolean

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)

· zero or one <DRM Hierarchy Summary Item>

Associated by (one-way)

· none

Associated with (two-way) (inherited)

· zero or more <DRM Feature>s

· zero or more <DRM Geometry Hierarchy>

· zero or more <DRM Property Grid>s

Associated with (two-way)

· none

Composed of (two-way) (inherited)

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

· zero or more <DRM Base Level Of Detail Data>s

· zero or one <DRM Classification Data>

· zero or more <DRM Colour>s

· zero or more <DRM Feature Topology Hierarchy>s

· zero or more {ordered} <DRM Image Mapping Function>s³

· zero or more <DRM Label>s

· zero or one <DRM Perimeter Data>

· zero or one <DRM Point Of Contact>

· zero or one <DRM Presentation Domain>⁴

· zero or more <DRM Property Description>s

· zero or more <DRM Property Table>s

· zero or more <DRM Property Table Reference>s

· zero or more <DRM Property Value>s

· zero or one <DRM Reference Surface>

· zero or one <DRM Rendering Priority Level>

· zero or more <DRM Sound Instance>s

· zero or one <DRM Spatial Domain>

· zero or one <DRM Time Constraints Data>

Composed of (two-way)

· a bounded set of 1..4 <DRM Feature Hierarchy>s through <DRM Quad Tree Data>

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 Alternate Hierarchy Related Features>s through <DRM Hierarchy Data>s

· zero or more <DRM Classification Related Features>s through <DRM Classification Data>s

· zero or one <DRM Environment Root>

· zero or one <DRM Feature Model>

· zero or more <DRM Level Of Detail Related Features>s through <DRM Base Level Of Detail Data>s

· zero or more <DRM Oct Tree Related Features>s through <DRM Oct Tree Data>s

· zero or more <DRM Perimeter Related Features>s through <DRM Perimeter Data>s

· zero or more <DRM Quad Tree Related Features>s through <DRM Quad Tree Data>s

· zero or more <DRM Spatial Index Related Features>s through <DRM Spatial Index Data>s

· zero or more <DRM State Related Features>s through <DRM State Data>s

· zero or more <DRM Time Related Features>s through <DRM Time Constraints Data>s

· zero or more <DRM Union Of Features>s

Component of (two-way)

· none

Constraints

· Colour mapping restrictions

· Distinct link objects

· Image mapping functions and texture coordinates

· No attribute conflicts

· Non-crossing aggregations

· Non-crossing associations

· Non-cyclic aggregations

· Precedence of Attribute_Set_Index

· Quad tree related organizing principle

Notes

¹ If TRUE, for any object that exists 'below' this aggregation, each object will appear in only one 'branch' of this aggregation. If FALSE, objects may appear in multiple 'branches' of this aggregation.

² If TRUE, each 'branch' strictly follows the rules of this aggregation. If FALSE, each 'branch' might bend the rules a bit. For example, if this is a spatial aggregation, a value of TRUE indicates that objects will not cross the spatial extents defined by this aggregation relationship, and a value of FALSE indicates that objects might cross those bounds. For another example, if this is a time-based aggregation, a value of TRUE indicates that all branches will only contain data valid for the times specified for each branch, and a value of FALSE indicates that the branches have the option of including data that falls outside of the specified time ranges for that branch.

³ Provided 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 <DRM Feature> by the consumer. These <DRM Image Mapping Function> shall use <DRM Image Anchor> components to specify the mapping.

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

Class diagram

<DRM Quad Tree Related Features>