Class

• <DRM Perimeter Data>

Superclass

• <DRM SEDRIS Abstract Base>

Subclass

• None.

Definition

An instance of this DRM class specifies the perimeter of the region corresponding to the attributed object. The ordered <DRM Location> components of a <DRM Perimeter Data> instance specify the perimeter (outline) of the given region by specifying an implicit line between each pair of <DRM Location> components i, i+1, with a last implicit line connecting the last <DRM Location> component to the first <DRM Location> component.

When a <DRM Perimeter Data> instance is provided as a component of another object, the aggregate is the attributed object for which the perimeter is being specified. When a <DRM Perimeter Data> instance is provided as a link object in a perimeter-related organization, the component object on the associated branch is the attributed object for which the perimeter is being specified.

Class diagram

Figure 6.195 — DRM_Perimeter_Data

Constraints

• Non self overlapping Perimeter Data Locations
• Publishable Object

Example(s)

• 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 <DRM Perimeter Related Features> organization, in which each tile's boundary can be correctly represented by a <DRM Perimeter Data>.

  Note that while a rectangular tile can be described by a <DRM Perimeter Data> instance with 4 <DRM Location> instances, an irregularly shaped tile may require a much larger number of <DRM Location> instances.

• Consider a polygonal representation of a region of terrain, organized into tiles based on political boundaries, such as different provinces within a country or different countries. Many of the tiles in this example have irregular shapes, so each tile is organized under a separate <DRM Geometry Hierarchy> component of a <DRM Perimeter Related Geometry>, with the corresponding <DRM Perimeter Data> describing the boundary of that tile.

• See also <DRM Perimeter Related Geometry>.