Class Name: Perimeter Related Features
Subclasses
This DRM class is concrete and has no subclasses.
Definition
An instance of this DRM class is
an <Aggregate Feature> instance that spatially
organizes its <Feature Hierarchy> components
into a collection of (potentially) irregularly shaped regions,
each defined by a <Perimeter Data> instance.
That is, each <Feature Hierarchy> component
is contained within the perimeter area specified by
the <Perimeter Data> instance associated with
that component.
Primary Page in DRM Diagram:
Secondary Pages in DRM Diagram:
This class appears on only one page of the DRM class diagram.
Example
Consider a thematic coverage in which the spatial extent forms
a collection of tiles, where some of the tiles (due to
shorelines) have irregular shapes. Consequently, this
coverage is represented by a <Perimeter Related Features>
instance, in which the boundary of each tile can be correctly
represented by a <Perimeter Data> link object.
NOTE
While a rectangular tile can be described by a
<Perimeter Data> link object with four
<Location> components,
an irregularly shaped tile may require a larger number of
<Location> components.
FAQs
-
May the regions defined by the
<Feature Hierarchy> components of a
<Perimeter Related Features>
instance overlap?
See
<<Perimeter Related Organizing Principle>>
-
May the same <Feature Representation>
instance be contained within more than one
<Feature Hierarchy> component of a
<Perimeter Related Features>
instance?
See
<<Perimeter Related Organizing Principle>>
-
Does each <Feature Hierarchy> component
of a
<Perimeter Related Features>
instance form an independent topological surface?
Normally, yes, in which case each
<Feature Hierarchy> component has its own
<Feature Topology Hierarchy>
component.
However, the <Feature Topology>
instances in all the components may also form a single topological surface,
in which case only the
<Perimeter Related Features>
instance itself has such a topology hierarchy.
Constraints
Associated to (one-way) (inherited)
Associated by (one-way) (inherited)
Composed of (two-way) (inherited)
Composed of (two-way)
Composed of (two-way metadata) (inherited)
Component of (two-way) (inherited)
Notes
Associated to Notes
An association between two
<Feature Representation> instances
indicates that the environmental object(s) that they
represent have the semantic relationship indicated by
the <Base Association Data>
link object on the association relationship.
An association between a
<Geometry Hierarchy> instance and a
<Feature Representation> instance
indicates that the environmental object(s) that they
represent have the semantic relationship indicated by
the <Base Association Data>
link object on the association relationship.
An association between a
<Property Grid> instance and a
<Feature Representation> instance
indicates that the environmental object(s) represented by the
<Feature Representation> instance
and the <Property Grid> instance
(or some specific cell data within that
<Property Grid> instance) have the
semantic relationship indicated by the
<Base Association Data> link object
on the association relationship. Each associated
<Property Grid> instance indicates
whether the entire <Property Grid>
instance or only some specific cell data within it is participating
in the relationship in question.
Associated from Notes
An association between two
<Feature Representation> instances
indicates that the environmental object(s) that they
represent have the semantic relationship indicated by
the <Base Association Data>
link object on the association relationship.
An association between a
<Geometry Hierarchy> instance and a
<Feature Representation> instance
indicates that the environmental object(s) that they
represent have the semantic relationship indicated by
the <Base Association Data>
link object on the association relationship.
An association between a
<Property Grid> instance and a
<Feature Representation> instance
indicates that the environmental object(s) represented by the
<Feature Representation> instance
and the <Property Grid> instance
(or some specific cell data within that
<Property Grid> instance) have the
semantic relationship indicated by the
<Base Association Data> link object
on the association relationship. Each associated
<Property Grid> instance indicates
whether the entire <Property Grid>
instance or only some specific cell data within it is participating
in the relationship in question.
Composed of Notes
The <Image Mapping Function> components
support texture mapping information
for geometry that is to be derived from the
<Aggregate Feature> instance
by the consumer.
These <Image Mapping Function>
instances shall use <Image Anchor>
components to specify the mapping.
A <Presentation Domain> component is needed for
<Aggregate Feature> instances that are
significant only for a particular domain, such as radar.
Fields Notes
If the value of the
unique_descendants
field is SE_TRUE, each
descendant shall be unique in the sense that it shall
appear in only one branch of this aggregation.
Each descendant is a <Feature Representation> instance
within the component tree rooted at the
<Aggregate Feature> instance.
If unique_descendants
is SE_FALSE, at least one
<Feature Representation> instance
appears in more than one branch of the aggregation.
If the value of the
strict_organizing_principle
field is SE_TRUE, each
branch of this aggregation
strictly complies with the organizing principle for its
particular subclass. If this value is
SE_FALSE, at least
one branch does not strictly comply with the given
organizing principle. See the organizing principle constraint
for each specific subclass for details.
Prev: Perimeter Related Feature Topology.
Next: Perimeter Related Geometry.
Up:Index.