The SEDRIS Data Representation Model
APPENDIX A - Classes
Proximity Data

Class Name: Proximity Data

Superclass - <Base Spatial Association Data>

Subclasses

This DRM class is concrete and has no subclasses.

Definition

An instance of this DRM class specifies the semantic meaning of the association relationship with which it is bound. This is a spatial relationship.

Primary Page in DRM Diagram:

Secondary Pages in DRM Diagram:

This class appears on only one page of the DRM class diagram.

Example

  1. Consider an aerodrome providing air traffic control and an air transportation route designed to channel air traffic into that aerodrome. The aerodrome is represented in a transmittal by a <Point Feature> instance A and the air transportation route is represented by a <Linear Feature> instance R. The topology of R consists of a sequence of <Feature Edge> instances E1, E2, E3, and E4 that are associated to R through <Edge Direction> link objects such that

    1. the endpoints of E1 are the <Feature Node> instances N0 and N1
    2. the endpoints of E2 are the <Feature Node> instances N1 and N2
    3. the endpoints of E3 are the <Feature Node> instances N2 and N3
    4. the endpoints of E4 are the <Feature Node> instances N3 and N4

    In this transmittal, N0 is associated with A and represents the location of the aerodrome, while N1, N2, N3, and N4 are aviation waypoints associated with <Point Feature> instances W1, W2, W3, and W4. At each waypoint an aircraft pilot may find it useful to know the shortest distance to the aerodrome A, so each Wi has an association relationship to A through a <Proximity Data> link object with meaning = SE_SPATASSMEANTYP_IN_PROXIMITY_OF and distance = the shortest distance from that waypoint to the aerodrome.

FAQs

No FAQs supplied.

Constraints

Inherited Field Elements

SE_Spatial_Association_Meaning_Type meaning; 1

Field Elements

SE_Long_Float distance; 2

Notes

Fields Notes

meaning

The meaning field specifies the semantic meaning of the association relationship with which the <Base Spatial Association Data> instance is bound.

distance

The value of the distance field, which is measured in metres, represents the shortest distance between any two points of thing1 and thing2, where thing1 and thing2 are the environmental objects represented by the DRM object instances for which a relationship is being represented by the <Proximity Data> instance.


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Last updated: July 26, 2006 Copyright © 2006 SEDRIS