Table 6.246 — DRM_Spatial_Index_Related_Features

Property

Description

Class
  • <DRM Spatial Index Related Features>

Superclass

Subclass
  • None.

Definition

An instance of this DRM class specifies an aggregation of <DRM Feature Hierarchy> objects in which each component <DRM Feature Hierarchy> represents a different tile within a spatially indexed (tiled) organization of <DRM Primitive Feature> objects within a SEDRIS transmittal. The <DRM Spatial Index Data> link object corresponding to each component A CLASS="Feature_Hierarchy"> Feature Hierarchy indicates which tile it represents.

This DRM class exists to allow <DRM Feature> objects to be organized (tiled) according to some regular spatial index.

Class diagram

Figure 6.293 — DRM_Spatial_Index_Related_Features

Inherited field elements

Field name

Range

Field data type

unique_descendants1

 

Boolean

strict_organizing_principle2

 

Boolean

Field elements

Field name

Range

Field data type

sparse3

 

Boolean

column_count

 

Integer_Positive

row_count

 

Integer_Positive

column_width4

 

Long_Float

row_width5

 

Long_Float

spacing_unit

 

Spatial_Index_Spacing_Unit

Associated to (one-way) (inherited)
  • None.

Associated to (one-way)
  • None.

Associated by (one-way) (inherited)

Associated by (one-way)
  • None.

Associated with (two-way) (inherited)

Associated with (two-way)
  • None.

Composed of (two-way) (inherited)

Composed of (two-way)

Composed of (two-way metadata) (inherited)

Composed of (two-way metadata)
  • None.

Component of (two-way) (inherited)

Component of (two-way)
  • None.

Constraints

Clarifications

1 If this value is TRUE, each “descendant” of this aggregation - that is, each <DRM Feature> instance that exists in the component tree rooted at the given <DRM Aggregate Feature> - shall be unique, in the sense that it shall appear in only one “branch” of this aggregation. If unique_descendants is FALSE, at least one <DRM Feature> instance appears in more than one “branch” of the aggregation.

2 If this value is TRUE, each “branch” of this aggregation strictly complies with the organizing principle for its particular subclass. If this value is FALSE, at least one “branch” does not strictly comply with the given organizing principle. See the organizing principle constraint for each specific subclass for details.

3 If this value is FALSE, all column and row entries are present; otherwise one or more entries are not present.

4 This is the length of a cell in the given unit along the X axis.

5 This is the length of a cell in the given unit along the Y axis.

6 An association between two <DRM Feature> instances indicates that they are alternate representations of the same environmental object.

7 An association between a <DRM Geometry Hierarchy> instance and a <DRM Feature> instance indicates that the <DRM Geometry Hierarchy> and the <DRM Feature> are alternate representations of the same environmental object.

8 An association between a <DRM Property Grid> instance and a <DRM Feature> instance indicates that the <DRM Feature> and the <DRM Property Grid> (or some specific cell data within that <DRM Property Grid>) are alternate representations of the same environmental object. Each associated <DRM Property Grid> will indicate which is the case.

9 This relationship exists to support “attributes for derived objects.” That is, these components are used only to specify texture mapping information for geometry that is to be derived from the <DRM Aggregate Feature> by the consumer. These <DRM Image Mapping Function> instances shall use <DRM Image Anchor> components to specify the mapping.

10 This is needed for cases in which an <DRM Aggregate Feature> is significant only for a particular domain, such as radar.

11 This is the origin of the collection, which is the lower-left corner.

Example(s)