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PANS-AIM requires the change over point (COP) to be encoded in case the path of the route segment(s) is a VOR radial. This is applicable only for convetional conventional routes, i.e. for ENR 3.1 Lower ATS Routes, ENR 3.2 Upper ATS Routes and ENR 3.4 Helicopter routes.
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In AIXM 5.1.1 the ChangeOverPoint is related to a RoutePortion and not a route segment. Hence, in order to encode COP information, also a corresponding RoutePortion has to be encoded.
The ChangeOverPoint.distance attribute is used to define the distance from the RoutePortion.start to position of the change over point. Only the distance from the start of the route portion is encoded. The distance from the end of the route portion can be derived from the length defiend defined by the start and end of the RoutePortion or b eencoded be encoded as a Note for the ChangeOverPoint.
The ChangeOverPoint.location may be used to define the position of COP as SignificantPoint. In this regard, only Point shall be used as SignificantPoint.
Coding Rules for Change Over Point
| RSG-501 | The SignificantPoint used as start and end of the RoutePortion a ChangeOverpoint is applicable to shall be a VOR or TACAN. | Data consistency | TBD | . |
| RSG-502 | The SignificantPoint used for the ChangeOverPoint.location shall be a Point. | Data consistency | TBD | |
| RSG-503 | The ChangeOverPoint.distance shall be the distance from the start of the related RoutePortion. | AIXM 5.1.1 | TBD |
Coding Examples
The figure below gives a simple example of a change over point:
More Examples TBD in teh the scope of teh the DONLON AIP data set XML.