Table 6.269—DRM_Spatial_Index_Related_Geometry

Property

Description

Superclass

·         <DRM Aggregate Geometry>

Class

·         <DRM Spatial Index Related Geometry>

Subclass

·         none

Definition

An object of this DRM class specifies an aggregation of <DRM Geometry Hierarchy> in which each component <DRM Geometry Hierarchy> represents a different tile within a spatially indexed (tiled) organization of <DRM Primitive Geometry> objects within a SEDRIS transmittal. The <DRM Spatial Index Data> link object attached to each component <DRM Geometry Hierarchy> indicates the tile that it represents.

Example(s)

·         Consider an <DRM Environment Root> describing a terrain surface that is a mix of grids and <DRM Polygon>s, organized by spatial indexing into 9 cells.

All cells except H are grids (represented in SEDRIS as <DRM Property Grid>s) captured at 1 level of detail. Cell H consists of <DRM Polygon>s.

Spatial Index Related Geometry, Example 2

Note that the components of the <DRM Spatial Index Related Geometry> are not ordered; the <DRM Spatial Index Data> is used to identify the individual tiles.

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)

·         zero or one <DRM Hierarchy Summary Item>

·         zero or more <DRM Reference Surface>s

Associated by (one-way)

·         none

Associated with (two-way) (inherited)

·         zero or more <DRM Feature>s

·         zero or more <DRM Geometry Hierarchy>s

Associated with (two-way)

·         none

Composed of (two-way) (inherited)

·         zero or more {ordered} <DRM Attribute Set Index>s

·         zero or more <DRM Base Level Of Detail Data>

·         zero or one <DRM Bounding Volume>

·         zero or one <DRM Centre Of Buoyancy>

·         zero or one <DRM Centre Of Mass>

·         zero or one <DRM Centre Of Pressure>

·         zero or one <DRM Classification Data>

·         zero or more <DRM Collision Volume>s

·         zero or more {ordered} <DRM Colour>s

·         zero or one <DRM Conformal Behaviour>

·         zero or more <DRM Geometry Topology Hierarchy>

·         zero or more <DRM Hierarchical Table>s

·         zero or more {ordered} <DRM Image Mapping Function>s

·         zero or one <DRM Light Rendering Properties>

·         zero or more <DRM Light Source>s

·         zero or one <DRM LSR Transformation>

·         zero or one <DRM Overload Priority Index>

·         zero or one <DRM Perimeter Data>

·         zero or one <DRM Point Of Contact>

·         zero or one <DRM Presentation Domain>

·         zero or more <DRM Property Description>s

·         zero or more <DRM Property Table>s

·         zero or more <DRM Property Table Reference>s

·         zero or more <DRM Property Value>s

·         zero or one <DRM Reference Surface>

·         zero or one <DRM Rendering Priority Level>

·         zero or one <DRM Rendering Properties>

·         zero or more <DRM Sound Instance>s

·         zero or one <DRM Spatial Domain>

·         zero or one <DRM Stamp Behaviour>

·         zero or one <DRM Time Constraints Data>

Composed of (two-way)

·         one or more <DRM Geometry Hierarchy>s through <DRM Spatial Index Data>

·         one <DRM Location>6

Composed of (two-way metadata) (inherited)

·         zero or one <DRM Access>

·         zero or more <DRM Browse Media>s

·         zero or one <DRM Citation>

·         zero or more <DRM Cross Reference>s

·         zero or one <DRM Data Quality>

·         zero or one <DRM Description>

·         zero or one <DRM Keywords>

·         zero or one <DRM Point Of Contact>

Composed of (two-way metadata)

·         none

Component of (two-way) (inherited)

·         zero or more <DRM Alternate Hierarchy Related Geometry>s through <DRM Hierarchy Data>s

·         zero or more <DRM Animation Related Geometry>s

·         zero or more <DRM Classification Related Geometry>s through <DRM Classification Data>s

·         zero or one <DRM Environment Root>

·         zero or one <DRM Geometry Model>

·         zero or more <DRM Level Of Detail Related Geometry>s through <DRM Base Level Of Detail Data>s

·         zero or more <DRM Oct Tree Related Geometry>s through <DRM Oct Tree Data>s

·         zero or more <DRM Perimeter Related Geometry>s through <DRM Perimeter Data>s

·         zero or more <DRM Quad Tree Related Geometry>s through <DRM Quad Tree Data>s

·         zero or more <DRM Separating Plane Relations>s through <DRM Separating Plane Data>s

·         zero or more <DRM Spatial Index Related Geometry>s through <DRM Spatial Index Data>s

·         zero or more <DRM State Related Geometry>s through <DRM State Data>s

·         zero or more <DRM Time Related Geometry>s through <DRM Time Constraints Data>s

·         zero or more <DRM Union Of Geometry Hierarchy>s

Component of (two-way)

·         none

Constraints

·         Colour mapping restrictions

·         Distinct link objects

·         Image mapping functions and texture coordinates

·         No attribute conflicts

·         Non-crossing aggregations

·         Non-crossing associations

·         Non-cyclic aggregations

·         Precedence of Attribute_Set_Index

·         Spatial_Index related organizing principle

Notes

1 If TRUE, for any object that exists 'below' this aggregation, each object will appear in only one 'branch' of this aggregation. If FALSE, objects may appear in multiple 'branches' of this aggregation.

2 If TRUE, each 'branch' strictly follows the rules of this aggregation. If FALSE, each 'branch' might bend the rules a bit. For example, if this is a spatial aggregation, a value of TRUE indicates that objects will not cross the spatial extents defined by this aggregation relationship, and a value of FALSE indicates that objects might cross those bounds. For another example, if this is a time-based aggregation, a value of TRUE indicates that all branches will only contain data valid for the times specified for each branch, and a value of FALSE indicates that the branches have the option of including data that falls outside of the specified time ranges for that branch.

3 If FALSE, all column and row entries (all expected Feature Hierarchy components) are present. If TRUE, one or more entries are not present.

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

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

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

Class diagram

<DRM Spatial Index Related Geometry>