Class Name: Property Grid Hook Point

Superclass - <Geometry Hierarchy>

Subclasses

Definition

A kind of <Geometry Hierarchy>. A <Property Grid Hook Point> is used to "instance" a <Property Grid> into the spatial scope of an <Environment Root>. In particular, the origin of the spatial axes of a component <Property Grid> is located at the <Property Grid Hook Point> component <Location>.

Since the <Property Grid Hook Point> separates the <Property Grid> data from the <Location>, <Property Grid> data can be re-used by several <Property Grid Hook Points>.

Primary Page in DRM Diagram:

• 6

Secondary Pages in DRM Diagram:

• 3
• 13

Example

1. A 1-dimensional <Property Grid> classified as ECC_WATER_BODY_BATHYMETRY_PROPERTY_SET contains a depth axis only. The <Property Grid Hook Point> <Location> serves to position this grid into the currently scoped 'world' spatial reference frame.
2. A 2-dimensional <Property Grid> classified as ECC_TERRAIN_ELEVATION contains elevation relative to the south-west corner of the grid. The <Property Grid Hook Point> <Location> serves to position this grid corner into the currently scoped 'world' spatial reference frame.

FAQs

If a <Property Grid> has all 3 spatial axes, isn't the hook <Location> redundant?

No, the hook point <Location> serves several purposes:

1. Since the spatial axes are relative, the hook <Location> provides the axis offset origins.
   
2. It makes a <Location> associated with the grid visible to API search filters (in the currently scoped 'world' spatial reference frame).

Constraints

• <<No Attribute Conflicts>>
• <<Non Crossing Aggregations>>
• <<Non Cyclic Aggregations>>
• <<Precedence of Attribute Set Index>>
• <<Non Crossing Associations>>

Associated by (one-way)(inherited)

• zero or one <Hierarchy Summary Item> instance (notes)
• zero or more <Reference Surface> instances (notes)

Associated with (two-way)(inherited)

• zero or more <Feature> instances (notes)
• zero or more <Geometry Hierarchy> instances (notes)

Associated with (two-way)

• zero or one <Geometry Node> instance

Composed of (two-way)(inherited)

• zero or more {ordered} <Attribute Set Index> instances
• zero or one <Classification Data> instance
• zero or more <Property Table> instances
• zero or more <Property Table Reference> instances
• zero or more <Property Value> instances
• zero or one <Reference Surface> instance
• zero or more <Sound Instance> instances

Composed of (two-way)

• zero or more <Base Level Of Detail Data> instances
• one <Location> instance
• zero or one <LSR Transformation> instance
• one or more <Property Grid> instances
• zero or one <Spatial Domain> instance

Composed of (two-way metadata)(inherited)

• zero or one <Time Constraints Data> instance
• zero or one <Access> instance
• zero or more <Browse Media> instances
• zero or more <Cross Reference> instances
• zero or one <Data Quality> instance
• zero or one <Keywords> instance
• zero or one <Point Of Contact> instance

Component of (two-way)(inherited)

• zero or more <Alternate Hierarchy Related Geometry> instances through <Hierarchy Data>
• zero or more <Animation Related Geometry> instances
• zero or more <Classification Related Geometry> instances through <Classification Data>
• zero or one <Environment Root> instance
• zero or one <Geometry Model> instance
• zero or more <Level Of Detail Related Geometry> instances through <Base Level Of Detail Data>
• zero or more <Oct Tree Related Geometry> instances through <Oct Tree Data>
• zero or more <Perimeter Related Geometry> instances through <Perimeter Data>
• zero or more <Quad Tree Related Geometry> instances through <Quad Tree Data>
• zero or more <Separating Plane Relations> instances through <Separating Plane Data>
• zero or more <Spatial Index Related Geometry> instances through <Spatial Index Data>
• zero or more <State Related Geometry> instances through <State Data>
• zero or more <Time Related Geometry> instances through <Time Constraints Data>
• zero or more <Union Of Geometry Hierarchy> instances

Inherited Field Elements

Notes

Associated with Notes

Feature

 An association between a <Geometry Hierarchy> instance and a
 <Feature> instance indicates that the <Geometry Hierarchy>
 and the <Feature> are alternate representations of the same
 environmental object.

Geometry_Hierarchy

 An association between two <Geometry Hierarchy> instances
 indicates that they are alternate representations of the same
 environmental object.

Hierarchy_Summary_Item

 An association from a <Hierarchy Summary Item> instance to a
 <Geometry Hierarchy> indicates that the <Hierarchy Summary Item>
 summarizes that <Geometry Hierarchy>.

Reference_Surface

 An association from a <Reference Surface> instance to a
 <Geometry Hierarchy> indicates that the <Geometry Hierarchy>
 organizes the geometric objects that specify the resolution
 surface of the <Reference Surface>.