e) Waypoint - en-route

Page Table of Content

Introduction & Background

Minimum Data Items

This page contains the mapping for the following data items as defined in PANS-AIM, chapter 5.3.3.1.1

e) Waypoint – en-route (identification, location, formation);

Conditional & Optional Data Items

Additional data items specified in the following sections of Appendix 2 of PANS-AIM - which are marked with #AIP-DS# - are taken into consideration as conditional data items for the mapping:

ENR 4.4 Name-code designators for significant points

Basic Mapping (Minimum data items)

These properties, which are considered as minimum AIP data set for Waypoint are mapped to the following main AIXM 5 features:

PANS-AIM	Description (PANS-AIM)	AIXM 5	Definition (AIXM 5.1.1)	Remarks
Identification	Names, coded designators or name-codes assigned to the significant point.	DesignatedPoint.designator, and DesignatedPoint.name	DesignatedPoint: A geographical location not marked by the site of a radio navigation aid, used in defining an ATS route, the flight path of an aircraft or for other navigation or ATS purposes. designator: The coded designator of the point. For example, the five-letter ICAO name of the point, etc.. name: The full textual name of a designated point, if any. For example, 'GOTAN Intersection' for GOTAN. Name may also be used to identify an unnamed point (See ARINC 424 for unnamed points.	Info PANS-AIM defines Identification as "Names, coded designators or name-codes assigned to the significant point." In AIXM, there is a dedicated attribute for designator and another one for name. As according to PANS-AIM a designated point may be identified either by a name or a designator, both attributes are mapped. In case a designated point has only a name, it is assumed that certain naming conventions will be applied (e.g. defined in ARINC 424) in order to "construct" a corresponding designator.
Position	Geographical location of the waypoint	DesignatedPoint.location, and DesignatedPoint.location.horizontalAccuracy	location: The geographical location of the designated point. horizontalAccuracy: The difference between the recorded horizontal coordinates of a point and its true position referenced to the same geodetic datum expressed as a circular error at 95 percent probability.
Formation - Navaid	The station identification of the reference VOR/DME	AngleIndication.pointChoice_navaidSystem, and/or DistanceIndication.pointChoice_navaidSystem	AngleIndication: An angular reference from a navaid or with reference to a designated point. DistanceIndication: A distance reference from a navaid or with reference to a designated point. pointChoice: A choice of a navaid, an airport reference point, a TLOF aiming Point, a fix , a lat/long indicated by point object, or a Rwy threshold which defines the facility makeup.
Formation - Bearing	The bearing from the reference VOR/DME, if the waypoint is not collocated with it;	AngleIndication.angle, and/or AngleIndication.angleType, and/or AngleIndication.trueAngle, and/or AngleIndication.indicationDirection equal-to 'FROM' .AngleIndication.fix.DesignatedPoint, and/or AngleIndication.annotation.Note.propertyName equal-to 'angle' .translatedNote.LinguisticNote.note	angle: The indication of a bearing (at a given point) by the measurement of the angle between the bearing and either True North or Magnetic North (this should appear explicitly or implicitly). The angle is measured clockwise from 0 degrees up to but not including 360 degrees. The value can also be a VOR radial. For example, Westward is expressed as 270. angleType: A code indicating the direction of the zero bearing. For example, magnetic north or true north. indicationDirection: Code indicating the if the angle is TO or FROM the Navaid or Designated Point that is used. trueAngle: The indication of a bearing (at a given point) by the measurement of the angle between the bearing and True North. The angle is measured clockwise from 0 degrees up to but not including 360 degrees. The value can also be a VOR radial. For example, Westward is expressed as 270. fix: A selected point that may have references (distance and/or angle indications)	AIXM 5.1.1 issue_013_indicationDirection The AIXM 5.1.1 description for indicationDirection is not clear "the if the": "Code indicating the if the angle is TO or FROM the Navaid or Designated Point that is used." Workaround: NA Status: To be reported to CCB AIXM 5.1.1 issue_014_AngleIndication AIXM 5 provides two different attributes for encoding the angle, whereas the definition of both do not seem to be clear enough in regard of how to encode the corresponding true and magnetic bearings correctly in AIXM . angle: "The indication of a bearing (at a given point) by the measurement of the angle between the bearing and either True North or Magnetic North (this should appear explicitly or implicitly). The angle is measured clockwise from 0 degrees up to but not including 360 degrees. The value can also be a VOR radial. For example, Westward is expressed as 270." trueAngle "The indication of a bearing (at a given point) by the measurement of the angle between the bearing and True North. The angle is measured clockwise from 0 degrees up to but not including 360 degrees. The value can also be a VOR radial. For example, Westward is expressed as 270." In addition also an angleType attribute is provided including inter alia the values 'TRUE' and 'MAG'. A code indicating the type of angle: magnetic, bearing, VOR radial. Also the description of the CodeBearingBaseType seems to be incorrect,... magnetic, bearing... PANS-AIM does not specify if magnetic or true bearing shall be provided. Hence, this allows several posibilities to encode the angle indication and also allows to code contradictory information.e.g. angle equal-to '100', angleType equal-to 'TRUE', trueAngle equal-to '102'. Workaround for AIXM 5.1(.1): see coding guidelines Point Reference (Formation) [PRF] Status AIXM 5.2: see CCB AIXM-181 trueAngle shall only be used in case both a magnetic and true shall be coded. In this case angle will be used for magnetic. AIXM 5.1.1 issue_015_Formation Bearing PANS-AIM requires an Accuracy for the Formation - Bearing. AIXM 5.1.1 does not provide a dedicated attribute. Workaround for AIXM 5.1(.1): Code a corresponding Note. Status AIXM 5.2: see CCB AIXM-269
Formation - Distance	The bearing from the reference VOR/DME, if the waypoint is not collocated with it;	DistanceIndication.distance, and/or DistanceIndication.fix.DesigantedPoint, and/or DistanceIndication.annotation.Note.propertyName equal to 'distance'.translatedNote.LinguisticNote.note	distance: The value of the distance. fix: A selected point that may have references (distance and/or angle indications)	AIXM 5.1.1 issue_016_Formation distance PANS-AIM requires an Accuracy for the Formation - Distance. AIXM 5.1.1 does not provide a dedicated attribute. Workaround for AIXM 5.1(.1): Code a corresponding Note. Status AIXM 5.2: see CCB AIXM-269

Additional Mapping (Reference to Route)

ENR 4.4 also requires:

3) reference to ATS or other routes where the point is located

Info

This data requirement is only listed in ENR 4.4. but not in PANS-AIM chapter 5.3.3.1.1 nor in the Aeronautical Data Catalogue.

PANS-AIM

Description (PANS-AIM)

AIXM 5

Definition (AIXM 5.1.1)

Remarks

Reference to route

This property is not defined in the PANS-AIM Aeronautical Data Catalogue.

RouteSegment.Route,

RouteSegment.start.EnRouteSegmentPoint.pointChoice_fixDesignatedPoint,

RouteSegment.end.EnRouteSegmentPoint.pointChoice_fixDesignatedPoint

start: The start EnRouteSegmentPoint for the Route Segment

end: The end EnRouteSegmentPoint for the Route Segment

Reverse association:

In AIXM 5.1.1 this information has to be be derived from the DesignatedPoint used as start or end for RouteSegment feature which is part of a Route.