ISO/IEC 18023-1:200x(E) — Table 6.254 DRM_Spatial_Index_Related

Table 6.254 — DRM_Spatial_Index_Related_Features

Property

Description

Class

<DRM Spatial Index Related Features>

Superclass

<DRM Aggregate Feature>

Subclass

None.

Definition

An instance of this DRM class specifies a spatially indexed related aggregation representing a collection of <DRM Feature Hierarchy> components in which each <DRM Feature Hierarchy> component represents a different tile within this aggregation. The <DRM Spatial Index Data> link object corresponding to each <DRM Feature Hierarchy> component indicates which tile it represents.

If the value of the sparse field is FALSE, all column and row entries are present; otherwise one or more entries are not present.

The column_count field specifies the number of cells along the primary axis.

The row_count field specifies the number of cells along the secondary axis.

The column_width field specifies the length of a cell in the given unit along the primary axis.

The row_width field specifies the length of a cell in the given unit along the secondary axis.

The spacing_unit field specifies the unit of measurement for column_width and row_width.

Class diagram

Figure 6.311 — DRM_Spatial_Index_Related_Features

Inherited field elements

Field name	Range	Field data type
unique_descendants		Boolean
strict_organizing_principle		Boolean

Field elements

Field name	Range	Field data type
sparse		Boolean
column_count		Integer_Positive
row_count		Integer_Positive
column_width		Long_Float
row_width		Long_Float
spacing_unit		Spatial_Index_Spacing_Unit

Default field values

Default field values for DRM_Spatial_Index_Related_Features

Associated to (one-way) (inherited)

zero or more <DRM Feature Representation> instances, each through the use of a <DRM Base Association Data> link object¹
zero or more <DRM Geometry Hierarchy> instances, each through the use of a <DRM Base Association Data> link object²
zero or more <DRM Property Grid> instances, each through the use of a <DRM Base Association Data> link object³

Associated to (one-way)

None.

Associated by (one-way) (inherited)

zero or more <DRM Feature Representation> instances, each through the use of a <DRM Base Association Data> link object⁴
zero or more <DRM Geometry Hierarchy> instances, each through the use of a <DRM Base Association Data> link object⁵
zero or more <DRM Property Grid> instances, each through the use of a <DRM Base Association Data> link object⁶
zero or one <DRM Hierarchy Summary Item> instance

Associated by (one-way)

None.

Associated with (two-way) (inherited)

None.

Associated with (two-way)

None.

Composed of (two-way) (inherited)

zero or one <DRM Classification Data> instance
zero or more <DRM Label> instances
zero or more {ordered} <DRM Property Set Index> instances
zero or more <DRM Property Table> instances
zero or more <DRM Property Table Reference> instances
zero or more <DRM Property Value> instances
zero or one <DRM Rendering Priority Level> instance
zero or one <DRM Reference Surface> instance
zero or more <DRM Sound Instance> instances
zero or more <DRM Base LOD Data> instances
zero or more <DRM Colour> instances
zero or more <DRM Feature Topology Hierarchy> instances
zero or more {ordered} <DRM Image Mapping Function> instances⁷
zero or one <DRM Perimeter Data> instance
zero or one <DRM Presentation Domain> instance⁸
zero or more <DRM Property Description> instances
zero or one <DRM Spatial Extent> instance

Composed of (two-way)

one or more <DRM Feature Hierarchy> instances, each through the use of a <DRM Spatial Index Data> link object
one <DRM Location> instance⁹

Composed of (two-way metadata) (inherited)

zero or one <DRM Data Quality> instance
zero or one <DRM Identification> instance
zero or one <DRM Time Constraints Data> instance

Composed of (two-way metadata)

None.

Component of (two-way) (inherited)

zero or more <DRM Union Of Features> instances
zero or more <DRM Alternate Hierarchy Related Features> instances, each through the use of a <DRM Hierarchy Data> link object
zero or more <DRM Classification Related Features> instances, each through the use of a <DRM Classification Data> link object
zero or one <DRM Environment Root> instance
zero or one <DRM Feature Model> instance
zero or more <DRM LOD Related Features> instances, each through the use of a <DRM Base LOD Data> link object
zero or more <DRM Octant Related Features> instances, each through the use of a <DRM Octant Data> link object
zero or more <DRM Perimeter Related Features> instances, each through the use of a <DRM Perimeter Data> link object
zero or more <DRM Quadrant Related Features> instances, each through the use of a <DRM Quadrant Data> link object
zero or more <DRM Spatial Index Related Features> instances, each through the use of a <DRM Spatial Index Data> link object
zero or more <DRM State Related Features> instances, each through the use of a <DRM State Data> link object
zero or more <DRM Time Related Features> instances, each through the use of a <DRM Time Constraints Data> link object

Component of (two-way)

None.

Constraints

Clarifications

¹An association between two <DRM Feature Representation> instances indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> link object on the association relationship.

²An association between a <DRM Geometry Hierarchy> instance and a <DRM Feature Representation> instance indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> link object on the association relationship.

³An association between a <DRM Property Grid> instance and a <DRM Feature Representation> instance indicates that the environmental object(s) represented by the <DRM Feature Representation> instance and the <DRM Property Grid> instance (or some specific cell data within that <DRM Property Grid> instance) have the semantic relationship indicated by the <DRM Base Association Data> link object on the association relationship. Each associated <DRM Property Grid> instance indicates whether the entire <DRM Property Grid> instance or only some specific cell data within it is participating in the relationship in question.

⁴An association between two <DRM Feature Representation> instances indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> link object on the association relationship.

⁵An association between a <DRM Geometry Hierarchy> instance and a <DRM Feature Representation> instance indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> link object on the association relationship.

⁶An association between a <DRM Property Grid> instance and a <DRM Feature Representation> instance indicates that the environmental object(s) represented by the <DRM Feature Representation> instance and the <DRM Property Grid> instance (or some specific cell data within that <DRM Property Grid> instance) have the semantic relationship indicated by the <DRM Base Association Data> link object on the association relationship. Each associated <DRM Property Grid> instance indicates whether the entire <DRM Property Grid> instance or only some specific cell data within it is participating in the relationship in question.

⁷The <DRM Image Mapping Function> components support texture mapping information for geometry that is to be derived from the <DRM Aggregate Feature> instance by the consumer. These <DRM Image Mapping Function> instances shall use <DRM Image Anchor> components to specify the mapping.

⁸A <DRM Presentation Domain> component is needed for <DRM Aggregate Feature> instances that are significant only for a particular domain, such as radar.

⁹The <DRM Location> component is the origin of the collection, which is the lower left corner.

Example(s)

Consider a <DRM Spatial Index Related Features> instance with row_count = 1, column_count = 4, row_width = 1000 metres, column_width = 500 metres. For simplicity, each of the four branches of the <DRM Spatial Index Related Features> instance in this example is a <DRM Union Of Features> instance, as depicted in Figure 6.312:

Figure 6.312 — <DRM Spatial Index Related Features> feature example

Since the origin of the collection (its lower left corner, the <DRM TM Augmented 3D Location> component) is (0, 0, 0), the coverages of the branches are:
1. from (0, 0) to (500, 1000)
2. from (500, 0) to (1000, 1000)
3. from (1000, 0) to (1500, 1000)
4. from (1500, 0) to (2000, 1000)
NOTE A <DRM Spatial Index Related Features> instance does not specify the range of z/height/elevation values.
Consider a triangular <DRM Areal Feature> instance in branch #2 of the previous example’s aggregation, consisting of one regular <DRM Feature Face> instance, which in turn has an external <DRM Feature Face Ring> instance containing three <DRM Feature Edge> instances as depicted in Figure 6.313:

Figure 6.313 — <DRM Spatial Index Related Features> topology example

Since the <DRM Areal Feature> instance thus crosses the boundary between branch #2 and branch #3, the <DRM Spatial Index Related Features> instance’s strict_organizing_principle is set to FALSE.