For TLOF, PANS-AIM requires some basic properties as part of the minimum AIP data set. These are
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The TouchDownLiftOff.designator attribute represents the textual designator of the TLOF, used to distinguish physical TLOFs at an Aerodrome/Heliport that has more than one. The attribute value should reflect the local convention for physical TLOF naming at the Aerodrome/Heliport.
Example Sample TLOF designator values could be: HELIPAD-A, HELIPAD-B; TLOF1, TLOF2; etc.
If there is just one TLOF, the Designator designator can be just "TLOF".
TLOF Centre Point (aimingPoint)
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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 According to ICAO Annex 14, Volume II,
This definintions definitions give the impression that the aimig aiming point is not the centre point of the TLOF. Currently in AIXM, it is not possible to define the two different points for a TLOF. Anyhow, it seems that the relationship hasAimingPoint and the property TLOF.aimingPoint is not correct. It should be rather hasCentrePoint and TLOF.centrePoint. Also, an aiming point may be idenpendent form independent from a TLOF na d and may also be marked and lighted. It seem seems that currently aiming point is not covered by AIXM 5. The workaround is to code that information in a Note. |
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In case an aming point and a centre point shall be coded for the TLOF, the actual aiming point has to be coded as Note.
TLOF Dimension (
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length & width)
The TLOF dimension attributes are used to describe the physical dimension of a TLOF.
The TouchDownLifftOffTouchDownLiftOff.length ist he is the declared longitudinal extent of the TLOF.
The TouchDownLifftOffTouchDownLiftOff.width is the declared transversal extent of the TLOF.
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| For both attributes a dedicated attribute to provide accuracy is missing. |
As a workaround, the accuracy value for the length and width may be encodes encoded as note for the correpsonding corresponding property.
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| How shall a circle shape be coded? Diameter as length and width? Releation Relation to Surface class missing? |
Surface
For the TLOF, PANS-AIM requires to provide the surface type.
In AIXM 5, the SurfaceCharacteristicSurfaceCharacteristics.composition attribute is used to code the surface type, e.g. asphalt, concrete, grass, etc.
The SurfaceCharacteristic SurfaceCharacteristics class groups together more attributes that model the characteristics of an airport surface, such as strength, material, etc.
For detailed information about the surface characteristic characteristics attributes & corresponding rules please refer to topic Surface Characteristic [SCH].
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TBD in the scope of the DONLON AIXM AIP dat data set.