ISO/IEC 18023-1:200x(E) — Table 6.253 DRM_Spatial_Index_Related_Feature

Table 6.253 — DRM_Spatial_Index_Related_Feature_Topology

Property

Description

Class

<DRM Spatial Index Related Feature Topology>

Superclass

<DRM Feature Topology Hierarchy>

Subclass

None.

Definition

An instance of this DRM class specifies a spatially indexed related aggregation representing a collection of primitive <DRM Feature Topology> instances.

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 6.310 — DRM_Spatial_Index_Related_Feature_Topology

Inherited field elements

Field name	Range	Field data type
feature_topology_level		Feature_Topology_Level

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_Feature_Topology

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)

None.

Associated with (two-way)

None.

Composed of (two-way) (inherited)

None.

Composed of (two-way)

one <DRM Location> instance¹
one or more <DRM Union Of Feature Topology> instances, each through the use of a <DRM Spatial Index Data> link object

Composed of (two-way metadata) (inherited)

None.

Composed of (two-way metadata)

None.

Component of (two-way) (inherited)

zero or more <DRM Aggregate Feature> instances

Component of (two-way)

None.

Constraints

Clarifications

¹The <DRM Location> component is the origin of the collection, which is the lower left corner.

Example(s)

A <DRM Aggregate Feature> instance can have more than one spatial related organization for its topology. In a given transmittal, the top <DRM Aggregate Feature> instance under a <DRM Environment Root> instance has a single 10 kilometre by 10 kilometre spatial related organization of topology spanning the entire transmittal, as well as a single 500 metres by 500 metres spatial related organization of topology also spanning the entire transmittal. That top <DRM Aggregate Feature> instance has two <DRM Spatial Index Related Feature Topology> components, one for the 10 kilometre squares and one for the 500 metre squares.