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Introduction
For TLOF, PANS-AIM requires some basic properties as part of the minimum AIP data set. These are
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PANS-AIM requires the centre point of the TLOF to be provided including its elevation and geoid undulation.
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In AIXM , only the aiming point of a TLOF can be coded. Is the The aiming point is not the same position as the centre point of a TLOF?. According to ICAO Annex 14, Volume II,
This definitions give the impression that the aiming point is not the centre point of the TLOF. Currently in AIXM 5, 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 hasCentrePoint and TLOF.centrePoint. Also, an aiming point may be independent from a TLOF and may also be marked and lighted. It seems that currently aiming point is not covered by Workaround for AIXM 5. The workaround is to code that information in a Note. |
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1(.1):
Status AIXM 5.1: See CCB AIXM-268 |
The ElevatedPoint class provides also dedicated attributes for elevation and geoidUndulation.
In addition the horizontal and vertical accuracy defined by PANS-AIM may be coded using the horizontalAccuracy and verticalAccuracy attribute.
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| title | Note |
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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.
TLOF Dimension (length & width)
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| For both attributes a dedicated attribute to provide accuracy is missing in AIXM 5. | ||
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PANS-AIM defines an accuracy for the TLOF length and width. AIXM 5.1.1 does not have dedicated attributes for that purpose. Workaround for AXM 5.1(.1): As a workaround, the accuracy value for |
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the length |
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and width |
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may be encoded |
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as annotation |
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for the corresponding property. Status: see CCB AIXM-269 |
In addition the extend of the TouchDownLiftOff may be coded using the ElevatedSurface class. In case of a rectangular shape the defined extend (by a set of points with latitude longitude information) shall be consistent with the provided length and width values.
In many cases the shape of a TLOF will be a circle rather than a rectangular. In such case the length and width may not be coded (although required as minimum data for the AIP data set). In such cases only the extend shall be coded, using the corresponding gml element for a circle (see document 12-028_Use_of_GML_for_aviation_data-2.pdfelements of the Surface class (see also Geometry).
Surface Type (composition)
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| Identifier | Data Encoding Rule | Justification | Data Verification Rule (UID) | Remarks | |
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| TLA-101 | The TouchDownLiftOff.designator attribute is mandatory. | Minimum AIP data set | AIXM-5.1_RULE-1A3369 | ||
| TLA-102 | The TouchDownLiftOff.aimingPoint property is mandatory. | Minimum AIP data set | AIXM-5.1_RULE-1A338B | The aimingPoint property is used to actually code the centre point, see also AIXM 5.1(.1) issue above. | |
| TLA-112 | The TouchDownLiftOff.ElevatedPoint.elevation attribute is mandatory | Minimum AIP data set | TBD | ||
| TLA-113 | The TouchDownLiftOff.ElevatedPoint.horizonalAccuracy should be provided. | PANS-AIM | TBD | ||
| TLA-114 | The TouchDownLiftOff.ElevatedPoint.verticalAccuracy should be provided. | PANS-AIM | TBD | ||
| TLA-115 | The TouchDownLiftOff.ElevatedPoint.geoidUndulation should be provided where appropriate. | PANS-AIM | TBD | ||
| TLA-103 | The TouchDownLiftOff.length attribute is mandatory unless an extend is coded. | Minimum AIP data set | TBD | Actually, PANS-AIM requires the length and width as part of the minimum AIP data set. Many TLOF will have rather the shape of a circle. In such cases the length and width attribute do not provide the correct information, but the Surface class shall be used to encode the correct extend of the TLOF. Also, if a a rectangular is encoded as extend for the TLOF the length and width attribute are not needed but may be provided in addition for publication purposes. | |
| TLA-104 | The TouchDownLiftOff.width attribute is mandatory unless an extend is coded. | Minimum AIP data set | TBD | see rule TLA-103 | |
| TLA-105 | If a value for the TouchDownLiftOff.length attribute is provided a Note for the TouchDownLiftOff with propertyName equal-to 'length' should be coded to provide the corresponding accuracy. | Minimum AIP data set | TBD | ||
| TLA-106 | If a value for the TouchDownLiftOff.width attribute is provided a Note for the TouchDownLiftOff with propertyName equal-to 'width' should be coded to provide the corresponding accuracy. | Minimum AIP data set | TBD | ||
| TLA-107 | For TouchDownLiftOff the SurfaceCharacteristic.composition attribute is mandatory. | Minimum AIP data set | TBD | ||
| TLA-108 | The position given by ElevatedPoint must be plausibly close (less than 20 KM) to that of the ARP of the related AirportHeliport. | EAD | TBD | ||
| TLA-109 | ElevatedPoint.geoidUndulation may be specified only if ElevatedPoint.elevation has been specified. | EAD | TBD | ||
| TLA-110 | The related Runway should be related to the same AirportHeliport as the TouchDownLiftOff. | EAD | TBD | ||
| TLA-111 | If both a width and length and also an extend is coded the data have to be consistent (i.e. the positions defined by the ElevatedSurface have to match with the values of the length and width). | Data consistency | TBD | ||
| TLA-116 | The TouchDownLiftOff.associatedAirportHeliport property is mandatory. | AIXM 4.5 / Minimal data rule | AIXM-5.1_RULE-1A334D | This is not required by PANS-AIM but any TLOF per se has to be located at an Airport/Heliport. | |
| TLA-117 | If coded, the value of the TouchDownLiftOff.aimingPoint.ElevatedPoint.vertical Accuracy shall be 0.5m or less for heliports with or without a PinS approach. | PANS-AIM | AIXM-5.1_RULE-D6D8E (rule does not take into account PinS approach constraint) | The aimingPoint property is used to actually code the centre point, see also AIXM 5.1(.1) issue above.PANS-AIM requires 0.5 m for the Elevation & the Geoid undulation. | |
| TLA-118 | If coded, the value of the TouchDownLiftOff.aimingPoint.ElevatedPoint.vertical Accuracy shall be 0.25m or less for heliports intended to be operated in accordance with ICAO Annex 14, Appendix 2. | PANS-AIM | TBD PANS-AIM Appendix 1 states :
Warning | | PANS_AIM issue |
| It is not clear what is meant by that statement? | |||||
| TLA-119 | If coded, the value of the TouchDownLiftOff.aimingPoint.ElevatedPoint.elevation shall be published with at least 1m or 1ft resolution for heliports with or without a PinS approach or for heliports intended to be operated in accordance with ICAO Annex 14, Appendix 2 (non-precision). | PANS-AIM | AIXM-5.1_RULE-D9C62 Note: the only think that can be verified in this case is the use of either FT or M as unit on measurement. A value such as "200 M" cannot be assumed to break this rule because maybe this is the exact elevation value. | ||
| TLA-120 | If coded, the value of the TouchDownLiftOff.aimingPoint.ElevatedPoint.elevation shall be published with at least 0.1 m or 0.1 ft resolution for heliports with or without a PinS approach or for heliports intended to be operated in accordance with ICAO Annex 14, Appendix 2 (non-precision). | PANS-AIM | |||
| TLA-121 | If coded, the value of the TouchDownLiftOff.aimingPoint.ElevatedPoint.geoidUndulation shall be published with at least 1m or 1ft resolution for heliports with or without a PinS approach or for heliports intended to be operated in accordance with ICAO Annex 14, Appendix 2 (non-precision). | PANS-AIM | AIXM-5.1_RULE-4611A Note: the only think that can be verified in this case is the use of either FT or M as unit on measurement. A value such as "200 M" cannot be assumed to break this rule because maybe this is the exact elevation value. | ||
| TLA-122 | If coded, the value of the TouchDownLiftOff.aimingPoint.ElevatedPoint.geoidUndulation shall be published with at least 0.1 m or 0.1 ft resolution for heliports with or without a PinS approach or for heliports intended to be operated in accordance with ICAO Annex 14, Appendix 2 (non-precision). | PANS-AIM | |||
| TLA-123 | Coordinates of TouchDownLiftOff.aimingPoint shall be published with at least 6 decimals resolution. | PANS-AIM | PANS-AIM requires a publication resolution of 1/100 sec second, which can be achieved by minimum 6 decimal of a degree. | ||
| TLA-124 | If coded, the value of the TouchDownLiftOff.aimingPoint.ElevatedPoint.horizontalAccuracy shall be 1 M or less. | PANS-AIM | AIXM-5.1_RULE-E681, AIXM-5.1_RULE-E682 (2nd rule checks 3.0 FT which is not defined in PANS-AIM) |
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Coding examples can be found in the DONLON AIXM 5.1.1 AIP data set file AIP Data Set - Specimen (DONLON):
| No. | Description | XPath Expression |
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| TLA-EX-01 | TLOF (rectangular shape defined by with length/width and extend) | //aixm:TouchDownLiftOffTimeSlice[@gml:id ='TLA_EADH_TLOF'] |