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PANS-AIMDescription (PANS-AIM)AIXM 5Definition (AIXM 5.1.1)Remarks
Threshold pointThe beginning of that portion of the FATO usable for landing.

RunwayCentrelinePoint.role equal-to'THR'

RunwayCentrelinePoint: An operationally significant position on the centre line of a runway direction. A typical example is the runway threshold.

role: The role of an operationally significant position on the centre line of a runway direction.



Threshold point - PositionGeographical location of FATO threshold point

RunwayCentrelinePoint.location.ElevatedPoint

and

RunwayCentrelinePoint.location.ElevatedPoint.horizontalAccuracy

location: Geographical position of the runway centreline 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.



Threshold point - ElevationElevation of the FATO threshold

RunwayCentrelinePoint.location.ElevatedPoint.elevation

and

RunwayCentrelinePoint.location.ElevatedPoint.verticalAccuracy

elevation: The vertical distance of the point measured from Mean Sea Level (MSL).

verticalAccuracy: The difference between the recorded elevation of a point and its true elevation referenced to the same vertical datum expressed as a linear error at 95 percent probability.

The verticalAccurracy encoded refers to both the elevation and the geoidUndulation.
Threshold point - Geoid undulationWGS-84 Geoid undulation at FATO threshold position

RunwayCentrelinePoint.location.ElevatedPoint.geoidUndulation

and

RunwayCentrelinePoint..location.ElevatedPoint.verticalAccuracy

geoidUndulation: The distance of the geoid above (positive) or below (negative) the mathematical reference ellipsoid at the location of the point.

According to ICAO Annex 14, Volume II

...geoid undulation of each threshold of the FATO (where appropriate) shall be measured and reported to the aeronautical information services authority....

Info
titleInfo for accuracy

In AIXM 5 the verticalAccuracy refers to both the elevation and the geoidUndulation.

Hence, if the verticalAccuracy is coded for the elevation but the accuracy for the Geoid undulation is not known, this should be put into a corresponding Note.

DesignationThe full textual designator of the landing and take-off area.

Runway.designator

Runway: A defined rectangular area on a land aerodrome/heliport prepared for the landing and take-off of aircraft. Note: this includes the concept of Final Approach and Take-Off Area (FATO) for helicopters.

designator: The designator of a runway, used to uniquely identify it at an aerodrome/heliport.


LengthThe longitudinal extent of FATO

Runway.nominalLength

and

Runway.lengthAccuracy

nominalLength: The declared longitudinal extent of the runway for operational (performance) calculations.

lengthAccuracy: Accuracy of the value of the physical length of the runway.


WidthThe transversal extent of FATORunway.nominalWidthnominalWidth: The declared transversal extent of the runway for operational (performance) calculations.

AIXM 5 provides a Runway.widthAccuracy attribute. But accuracy is not specified for the width of a FATO in PANS-AIM. (For "TLOF width" and "Runway width" PANS-AIM defines an accuracy.)


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