ISO/IEC 18023-1:200x(E) — Table 6.48 DRM_Conformal

Table 6.48 — DRM_Conformal_Behaviour

Property

Description

Class

<DRM Conformal Behaviour>

Superclass

<DRM SEDRIS Abstract Base>

Subclass

None.

Definition

The <DRM Geometry Hierarchy> to which a <DRM Conformal Behaviour> is attached conforms to the terrain skin automatically, either “parallel to gravity” (e.g., ensuring that the base of a building touches the ground without warping the walls) or orthogonally to the terrain skin (e.g. a fence).

Class diagram

Figure 6.54 — DRM_Conformal_Behaviour

Inherited field elements

Field name	Range	Field data type
None

Field elements

Field name	Range	Field data type
parallel_gravity ¹		Boolean
offset_distance ²		Float

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 metadata) (inherited)

None.

Composed of (two-way metadata)

None.

Component of (two-way) (inherited)

None.

Component of (two-way)

zero or more <DRM Aggregate Geometry> instances
zero or more <DRM Geometry Model Instance> instances
zero or more <DRM Point> instances
zero or more <DRM Vertex> instances

Constraints

Publishable Object

Clarifications

¹ If this value is TRUE, the direction of conformance is parallel to gravity; otherwise, the direction of conformance is orthogonal to the terrain skin.

² This is the distance above the given surface, in metres.

Example(s)

A <DRM Model> instanced to terrain. A <DRM Geometry Model Instance> may specify that the location component of its <DRM Transformation> is <DRM Conformal Behaviour> to the terrain skin. The terrain skin may use a <DRM Classification Related Geometry> aggregation to separate the surface that <DRM Model> conforms to from the rest of the <DRM Geometry>. If so, the <DRM Conformal Behaviour> instance can associate with the terrain skin. This would help the consumer resolve ambiguities when deriving the actual 3D location. The surface to be conformed to can be further qualified by the <DRM Property Value> that has been extended.
Consider a tree canopy that conforms to multiple, or continuous LOD terrain. The entire collection of tree canopy <DRM Polygon> instances and the tree wall <DRM Polygon> instances around the canopy is aggregated into a <DRM Classification Related Geometry>, which is associated with an <DRM Areal Feature>.
Each <DRM Vertex> of the <DRM Polygon> instances representing the tree wall around the canopy uses <DRM Conformal Behaviour>. The <DRM Conformal Behaviour> of each <DRM Vertex> on the ground has parallel_gravity = FALSE and offset_distance = 0, while the <DRM Conformal Behaviour> of the <DRM Vertex> instances at the top has parallel_gravity = = TRUE and a positive offset_distance indicating the height of the tree wall. Each <DRM Vertex> of the <DRM Polygon> instances representing the tree canopy has a <DRM Conformal Behaviour> with parallel_gravity = TRUE and offset_distance indicating the height of the tree canopy.
An airplane <DRM Model> might have <DRM Geometry> that represents the projected shadow. The <DRM Geometry Hierarchy> containing the shadow could be given <DRM Conformal Behaviour> so that it will hug the nominal terrain surface.