This section provides ‘TouchDownLiftOffArea’ feature data encoding guidance.

General

AMD data encoding can start when the necessary geographic information, aeronautical information and basic knowledge regarding the structure of created feature is available.

From the geographical point of view, several points of the outer border of the TouchDownLiftOffArea need to be captured. The key attributes are the longitude, latitude in reference with WGS-84 and the elevation of each captured point. In the next part the process of converting the geographical information into the GML form thus into geometry information is described.

Based on Aeronatical Data Catalogue the required type of geometry for feature TouchDownLiftOffArea is 'Polygon'. The definition of Polygon can be found in the Table A1-9 Data types of the Aeronautical Data Catalogue.

AMD encoding

AIXM 5.1

ED-99 feature TouchDownLiftOffArea is mapped to the AIXM 5.1 as feature TouchDownLiftOff.

Geometry

In the AIXM 5.1 the geometry of the Runway Element is polygon encoded as object ElevatedSurface.

For more information regarding AIXM 5.1 Geometry encoding follow 'AIXM data coding'.

GML considerations:

AIXM 5.1 is based on GML. Hence, obtained geographical locations shall be transferred into a GML geometry object PolygonPatch.

Figure 1 : TouchDownLiftOffArea

Time

TouchDownLiftOffArea shall be established in accordance with coding rules and requirements listed in AIXM 5.1 Temporality Model.

AIXM 5.1 features

TouchDownLiftOffArea is encoded to the AIXM 5.1 as TouchDownLiftOff feature.

All associations are shown in the UML Diagram (see below).

TouchDownLiftOff feature

http://aixm.aero/sites/aixm.aero/files/imce/AIXM51HTML/AIXM/Class_TouchDownLiftOff.html

UML Diagram (Helicopter Surfaces / TLOF)

http://aixm.aero/sites/aixm.aero/files/imce/AIXM51HTML/AIXM/Diagram_TLOF.html

Content of example

The following AMD properties are not covered in the AIXM 5.1. coding example: vres, hres, integr. These are covered by an AIXM 5.1. extension.

Coding example - Structure of message

<AIXMBasicMessage  ...>
  <aixm:messageMetadata>
  </aixm:messageMetadata>
  <hasMember>
    <aixm:AirportHeliport gml:id="uuid.0b7a2688-ab95-47e6-82c2-23fe321c4a48">
  </hasMember>
  <hasMember>
    <aixm:TouchDownLiftOff gml:id="uuid.8639ef79-e3ee-45e3-9383-0ebc5ee76f37">
  </hasMember>
</AIXMBasicMessage>

Coding example -

TouchDownLiftOffArea

  <hasMember>
    <aixm:TouchDownLiftOff gml:id="uuid.8639ef79-e3ee-45e3-9383-0ebc5ee76f37">
      <gml:identifier codeSpace="urn:uuid:">8639ef79-e3ee-45e3-9383-0ebc5ee76f37</gml:identifier>
      <aixm:timeSlice>
        <aixm:TouchDownLiftOffTimeSlice gml:id="uuid.bbe7cf75-934b-46b8-a02a-a2e033b9bc2d">
          <gml:validTime>
            <gml:TimePeriod gml:id="uuid.8b729465-d0a8-4ac8-bf0e-bc3bfa682b88">
              <gml:beginPosition>2020-09-01T00:00:00Z</gml:beginPosition>
              <gml:endPosition indeterminatePosition="unknown" />
            </gml:TimePeriod>
          </gml:validTime>
          <aixm:interpretation>BASELINE</aixm:interpretation>
          <aixm:sequenceNumber>1</aixm:sequenceNumber>
          <aixm:correctionNumber>0</aixm:correctionNumber>
          <aixm:featureLifetime>
            <gml:TimePeriod gml:id="uuid.6e4dd89c-8e22-4daf-baa0-9f37de9a0456">
              <gml:beginPosition>2020-09-01T00:00:00Z</gml:beginPosition>
              <gml:endPosition indeterminatePosition="unknown" />
            </gml:TimePeriod>
          </aixm:featureLifetime>
          <aixm:designator>TLOF 1</aixm:designator>
          <aixm:extent>
            <aixm:ElevatedSurface gml:id="uuid.9a6974ff-3f1b-4d5d-930e-0408129d76b2" srsName="urn:ogc:def:crs:EPSG::4326">
              <gml:patches>
                <gml:PolygonPatch>
                  <gml:exterior>
                    <gml:Ring>
                      <gml:curveMember>
                        <gml:Curve gml:id="uuid.abc118d9-eee9-48df-abe2-1ecc271b4f60">
                          <gml:segments>
                            <gml:GeodesicString interpolation="geodesic">
                              <gml:posList>50.09267244 14.28362853 50.09266328 14.28361331 50.09265042 14.2835965 50.09263911 14.28358483 50.09262408 14.28357314 50.09261144 14.28356586 50.09259503 14.28355981 50.09258164 14.28355736 50.09256483 14.28355719 50.09255142 14.28355967 50.09253508 14.28356561 50.09252236 14.28357275 50.09250728 14.28358447 50.09249603 14.28359594 50.09248311 14.28361272 50.09247386 14.28362786 50.09246375 14.28364881 50.09245692 14.28366694 50.09245028 14.28369097 50.09244636 14.28371114 50.09244342 14.28373689 50.09244258 14.28375783 50.09244353 14.28378386 50.09244586 14.28380453 50.09245064 14.28382961 50.092456 14.28384889 50.09246431 14.28387164 50.09247236 14.28388839 50.09248386 14.28390747 50.09249425 14.28392103 50.09250925 14.28393628 50.09252133 14.28394564 50.09253614 14.28395386 50.09254922 14.28395878 50.09256592 14.28396181 50.09257944 14.28396197 50.09259614 14.28395892 50.09260925 14.28395411 50.09262517 14.28394528 50.09263722 14.28393589 50.09265125 14.28392158 50.09266158 14.28390803 50.09267322 14.28388914 50.09268125 14.28387231 50.09268975 14.28384972 50.09269511 14.2838305 50.09269994 14.28380547 50.09270236 14.28378475 50.09270336 14.28375858 50.09270258 14.28373772 50.09269972 14.28371194 50.09269583 14.28369192 50.09268922 14.28366781 50.0926825 14.28364964 50.09267244 14.28362853</gml:posList>
                            </gml:GeodesicString>
                          </gml:segments>
                        </gml:Curve>
                      </gml:curveMember>
                    </gml:Ring>
                  </gml:exterior>
                </gml:PolygonPatch>
              </gml:patches>
              <aixm:horizontalAccuracy uom="M">1</aixm:horizontalAccuracy>
              <aixm:elevation uom="M">376</aixm:elevation>
              <aixm:verticalAccuracy uom="M">1</aixm:verticalAccuracy>
            </aixm:ElevatedSurface>
          </aixm:extent>
          <aixm:surfaceProperties>
            <aixm:SurfaceCharacteristics gml:id="uuid.2b19278a-a4ae-4370-a093-8d05713db052">
              <aixm:composition>CONC_ASPH</aixm:composition>
              <aixm:preparation>COMPACTED</aixm:preparation>
            </aixm:SurfaceCharacteristics>
          </aixm:surfaceProperties>
          <aixm:associatedAirportHeliport xlink:href="#0b7a2688-ab95-47e6-82c2-23fe321c4a48" xlink:title="LKPR" />
          <aixm:approachTakeOffArea xlink:href="#96b243ca-d114-475e-b195-06dd3af51ed9" xlink:title="FATO1" />
          <aixm:availability>
            <aixm:ManoeuvringAreaAvailability gml:id="uuid.60eed7f4-6b15-4115-9e9c-dc9bcb1d5b31">
              <aixm:operationalStatus>NORMAL</aixm:operationalStatus>
            </aixm:ManoeuvringAreaAvailability>
          </aixm:availability>
        </aixm:TouchDownLiftOffTimeSlice>
      </aixm:timeSlice>
    </aixm:TouchDownLiftOff>
  </hasMember>

Download feature TouchDownLiftOffArea:

BL_TLOF.xml

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