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The SEDRIS Data Representation Model
APPENDIX A - Classes Feature Edge |
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An instance of this DRM class is a one-dimensional <Feature Topology> instance consisting of an ordered collection of <Location> instances connecting one <Feature Node> instance to another <Feature Node> instance. The orientation of a <Feature Edge> instance is defined by the order of its <Location> components, taken in conjunction with its starting <Feature Node> instance and ending <Feature Node> instance.
A <Feature Edge> instance is used to represent the location of a segment of one or more <Linear Feature> instances, and/or a boundary of one or more <Feature Face> instances.
A <Linear Feature> instance representing the centreline of a road is defined by one or more <Feature Edge> instances.
The border of a forested area is defined by a collection of one or more <Feature Edge> instances.
<Feature Edge> instances are required whenever either <Linear Feature> or <Feature Face> instances are present.
No. The endpoints of a <Feature Edge> instance are defined by its ordered <Feature Node> associates.
Yes; see the constraints on this class for details.
At feature topology level 2 or higher, no <Feature Edge> instance may intersect with or overlap another <Feature Edge> instance. At feature topology level 3, each <Feature Edge> instance forms part of the boundaries of exactly two <Feature Face> instances.
The converse of this relationship is that between <Feature Face Ring> instances and <Feature Edge> instances.
The first <Feature Node> instance is the starting node of the <Feature Edge> instance, while the second <Feature Node> instance is the ending node.
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