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The SEDRIS Data Representation Model
APPENDIX A - Classes Point Feature |
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An instance of this DRM class specifies a <Primitive Feature> instance for which the spatial information needed for the representation can be abstracted to a single topologically significant location. This is sometimes referred to as a zero-dimensional location, since the topology associated with a <Point Feature> instance does not provide length, width, or height information.
Consider a well represented by a <Point Feature> instance. The <Point Feature> instance has a <Classification Data> component classifying it as ECC_WELL, an associated <Feature Node> instance specifying its location, and <Property Value> components specifying its depth below the terrain surface and the potability of the water it contains.
Consider a road interchange represented as a <Point Feature> instance. The <Point Feature> instance has a <Classification Data> component classifying it as ECC_ROAD_INTERCHANGE, and an associated <Feature Node> instance specifying its location. In addition, the <Feature Node> instance in this example is associated with some <Feature Edge> instances that are part of the topology of some <Linear Feature> instances representing the roads in question.
Consider a small building represented as a <Point Feature> instance. The <Point Feature> instance has a <Feature Node> instance specifying its location, a <Classification Data> component classifying it as ECC_BUILDING, and a set of <Property Value> components that describe its characteristics, such as its EAC_HEIGHT and its EAC_BUILDING_FUNCTION.
No. A <Point Feature> instance's topology shall consist of only a single <Feature Node> instance.
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