Table 6.270—DRM_Spatial_Index_Related_Geometry_Topology

Property

Description

Superclass

·         <DRM Geometry Topology Hierarchy>

Class

·         <DRM Spatial Index Related Geometry Topology>

Subclass

·         none

Definition

An object of this DRM class encodes a spatially indexed (tiled) organization of the primitive <DRM Geometry Topology> instances within a SEDRIS transmittal.

Example(s)

·         An <DRM Aggregate Geometry> can have more than one spatial organization for its topology. This allows various levels of organizations.  At the <DRM Aggregate Geometry> under an <DRM Environment Root>, one might find both a 10 km by 10 km spatial organization of topology spanning the entire transmittal, as well as a 500m by 500m spatial organization of topology.  That <DRM Aggregate Geometry> would have two <DRM Spatial Index Related Geometry Topology> components, one for the 10km squares and one for the 500m squares.

Inherited field elements

field_name

range

Field_Data_Type

geometry_topology_level

 

Geometry_Topology_Level

Field elements

field_name

range

Field_Data_Type

sparse1

 

Boolean

column_count

 

Integer_Positive

row_count

 

Integer_Positive

column_width2

 

Long_Float

row_width3

 

Long_Float

spacing_unit

 

Spatial_Index_Spacing_Unit

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>4

·         one or more <DRM Union Of Geometry Topology> through <DRM Spatial Index Data>

Composed of (two-way metadata) (inherited)

·         none

Composed of (two-way metadata)

·         none

Component of (two-way) (inherited)

·         zero or more <DRM Aggregate Geometry>s

Component of (two-way)

·         none

Constraints

·         Distinct link objects

Notes

1 Length of a cell in the given units along the X axis.

2 Length of a cell in the given units along the Y axis.

3 The origin of the collection. The lower-left corner.

Class diagram

<DRM Spatial Index Related Geometry Topology>