Table 6.191—DRM_Perimeter_Data
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Property |
Description |
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Superclass |
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Class |
· <DRM Perimeter Data> |
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Subclass |
· none |
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Definition |
An object of this DRM class describes the perimeter of the region corresponding to the attributed object. When used as a component, the aggregate is the object being so described; when used as a link object in a perimeter-related organization, the component on the associated branch is being described. The ordered <DRM Location> components of a <DRM Perimeter Data> define the outline (perimeter) of the region by defining an implicit line between each pair of <DRM Location>s i, i+1, with a last implicit line connecting the last <DRM Location> back to the first <DRM Location>. |
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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 four <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>. |
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Inherited field elements |
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Field elements |
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Associated to (one-way) (inherited) |
· none |
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Associated to (one-way) |
· none |
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Associated by (one-way) (inherited) |
· none |
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Associated by (one-way) |
· none |
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Associated with (two-way) (inherited) |
· none |
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Associated with (two-way) |
· none |
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Composed of (two-way) (inherited) |
· none |
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Composed of (two-way) |
· three or more {ordered} <DRM Location>s1 |
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Composed of (two-way metadata) (inherited) |
· none |
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Composed of (two-way metadata) |
· none |
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Component of (two-way) (inherited) |
· none |
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Component of (two-way) |
· zero or more <DRM Aggregate Feature>s · zero or more <DRM Aggregate Geometry>s · zero or more <DRM Sound Instance>s |
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Constraints |
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Notes |
1 The <DRM Location> defining the perimeter of the region. All of the <DRM Location>s shall be distinct. |
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Class diagram |