j) TLOF

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

j) TLOF (designator, centre point, length, width, surface type);

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

TouchDownLiftOff

PANS-AIM	Description (PANS-AIM)	AIXM 5	Remarks
Designator	The full textual designator of TLOF	TouchDownLiftOff.designator
Centre point - Position	Geographical location of TLOF geometric centre	TouchDownLiftOff.aimingPoint.ElevatedPoint TouchDownLiftOff.aimingPoint.ElevatedPoint.horizontalAccuracy	AIXM 5.1(.1) Issue In AIXM only the aiming point of a TLOF can be coded. Is the aiming point the same as the centre point of a TLOF? AccordingICAO Annex 14, Volume II, An aiming point marking should be provided at a heliport where it is necessary for a pilot to make an approach to a particular point before proceeding to the TLOF. The aiming point marking shall be located within the FATO. This definintion gives the impression that the aimig point is not the centre point of the TLOF. Currently in AIXM it is not possible to define two different points for a TLOF. TBD
Centre point - Elevation	Elevation of the TLOF geometric centre	TouchDownLiftOff.aimingPoint.ElevatedPoint.elevation TouchDownLiftOff.aimingPoint.ElevatedPoint.verticalAccuracy	The verticalAccurracy encoded refers to both the elevation and the geoidUndulation.
Centre point - Geoid undulation	WGS-84 Geoid undulation at TLOF geometric centre position	TouchDownLiftOff.aimingPoint.ElevatedPoint.geoidUndulation TouchDownLiftOff.aimingPoint.ElevatedPoint.horizontalAccuracy	The verticalAccurracy encoded refers to both the elevation and the geoidUndulation.
Length	The longitudinal extent of TLOF	TouchDownLiftOff.length	AIXM 5.1(.1) issue AIXM 5 does not provide a "lengthAccuracy" attribute for the TLOF feature. PANS-AIM defines an accuracy for the TLOF length.
Width	The transversal extent of TLOF	TouchDownLiftOff.width	AIXM 5.1(.1) issue AIXM 5 does not provide a "widthAccuracy" attribute for the TLOF feature. PANS-AIM defines an accuracy for the TLOF width.
Surface type	The surface type of TLOF	TouchDownLiftOff.surfaceProperties.SurfaceCharacteristics.composition