Table 6.267—DRM_Spatial_Index_Related_Feature_Topology

Property

Description

Superclass

·         <DRM Feature Topology Hierarchy>

Class

·         <DRM Spatial Index Related Feature Topology>

Subclass

·         none

Definition

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

Example(s)

·         An <DRM Aggregate Feature> can have more than one spatial organization for its topology. This allows various 'levels' or organizations. Perhaps at the 'top' <DRM Aggregate Feature> under the <DRM Environment Root>, there might be one 10km by 10km spatial organization of topology spanning the entire transmittal, as well as one 500m by 500m spatial organization of topology also spanning the entire transmittal. That 'top' <DRM Aggregate Feature> would have two <DRM Spatial Index Related Feature Topology> components, one for the 10km squares and one for the 500m squares.

Inherited field elements

field_name

range

Field_Data_Type

none

 

 

Field elements

field_name

range

Field_Data_Type

sparse

 

Boolean

column_count

 

Integer_Positive

row_count

 

Integer_Positive

column_width1

≥ 0,0

Long_Float

row_width2

≥ 0,0

Long_Float

spacing_units

 

      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>3

·         one or more <DRM Union Of Feature Topologies> through <DRM Spatial Index Data>

Composed of (two-way metadata) (inherited)

·         none

Composed of (two-way metadata)

·         none

Composed of (two-way) (inherited)

·         zero or more <DRM Aggregate Feature>s

Composed 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 Feature Topology>