v1.0.6

This section provides ‘TaxiwayIntersectionMarking’ 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, the TaxiwayIntersectionMarking represents a marking painted at a position at which taxiing aircraft and vehicles are expected to stop and hold until further cleared to proceed. For TaxiwayIntersectionMarking two or more points shall be measured. The key attributes are the longitude, latitude and the elevation in reference with WGS-84. 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 TaxiwayIntersectionMarking is 'Line'. The definition of Curve can be found in the Table A1-9 Data types of the Aeronautical Data Catalogue.

AMD encoding

AIXM 5.1

ED-99 feature TaxiwayIntersectionMarking mapped to the AIXM 5.1 as feature TaxiwayMarking with property Type set to "TWY_INT".

Geometry

In the AIXM 5.1 the geometry of the TaxiwayMarking can be point, curve or polygon, but in case of this feature the right geometry is curve encoded as object Elevated Curve. 

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 GeodesicString.


Figure 1 : TaxiwayIntersectionMarking

Time

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

AIXM 5.1 features

TaxiwayIntersectionMarking is encoded to the AIXM 5.1 as TaxiwayMarking with property Type set to "TWY_INT".

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

TaxiwayMarking feature

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

UML Diagram (SurfaceMarking)

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

UML Diagram (Taxiway)

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

Content of example

This is a ficticious example. No feature was present at the aerodrome used.

The following AMD properties are not covered in the AIXM 5.1. coding example: vres, hres, integr, idp, holddir, marktype, aippub. 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:Taxiway gml:id="uuid.3ae48a00-5f20-42c4-bb60-032252a56aa6">
  </hasMember>
  <hasMember>
    <aixm:TaxiwayElement gml:id="uuid.190eb7f6-59e8-4a02-aa88-891f362ace80">
  </hasMember>
  <hasMember>
    <aixm:TaxiwayMarking gml:id="uuid.b4eb0b69-f509-4c1c-a5ff-caf3694c0fc3">
  </hasMember>
</AIXMBasicMessage>

Coding example - TaxiwayIntersectionMarking

  <hasMember>
    <aixm:TaxiwayMarking gml:id="uuid.b4eb0b69-f509-4c1c-a5ff-caf3694c0fc3">
      <gml:identifier codeSpace="urn:uuid:">b4eb0b69-f509-4c1c-a5ff-caf3694c0fc3</gml:identifier>
      <aixm:timeSlice>
        <aixm:TaxiwayMarkingTimeSlice gml:id="uuid.733d52c5-e10d-427d-9078-02aa7f1ea32d">
          <gml:validTime>
            <gml:TimePeriod gml:id="uuid.6bedb4ca-c777-41f7-906c-4b1f9231735b">
              <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.59f35224-2dae-424a-9af2-99d03c14b7fa">
              <gml:beginPosition>2020-09-01T00:00:00Z</gml:beginPosition>
              <gml:endPosition indeterminatePosition="unknown" />
            </gml:TimePeriod>
          </aixm:featureLifetime>
          <aixm:element>
            <aixm:MarkingElement gml:id="uuid.1e8a0488-726b-4938-aa73-7ccd4380e58f">
              <aixm:extent_surfaceExtent>
                <aixm:ElevatedSurface gml:id="uuid.85fc1018-50e1-417f-9a57-8a4fc2e16605" srsName="urn:ogc:def:crs:EPSG::4326">
                  <gml:patches>
                    <gml:PolygonPatch>
                      <gml:exterior>
                        <gml:Ring>
                          <gml:curveMember>
                            <gml:Curve gml:id="uuid.5c476f9e-2e81-4c1a-bd2e-3b0e56dd1666">
                              <gml:segments>
                                <gml:GeodesicString interpolation="geodesic">
                                  <gml:posList>50.11433763 14.27617689 50.11453583 14.27683962</gml:posList>
                                </gml:GeodesicString>
                              </gml:segments>
                            </gml:Curve>
                          </gml:curveMember>
                        </gml:Ring>
                      </gml:exterior>
                    </gml:PolygonPatch>
                  </gml:patches>
                  <aixm:horizontalAccuracy uom="M">0.5</aixm:horizontalAccuracy>
                  <aixm:elevation uom="M">376</aixm:elevation>
                  <aixm:verticalAccuracy uom="M">0.5</aixm:verticalAccuracy>
                </aixm:ElevatedSurface>
              </aixm:extent_surfaceExtent>
            </aixm:MarkingElement>
          </aixm:element>
          <aixm:markingLocation>TWY_INT</aixm:markingLocation>
          <aixm:markedTaxiway xlink:href="#3ae48a00-5f20-42c4-bb60-032252a56aa6" xlink:title="Z" />
        </aixm:TaxiwayMarkingTimeSlice>
      </aixm:timeSlice>
    </aixm:TaxiwayMarking>
  </hasMember>


Download feature TaxiwayIntersectionMarking:

BL_TaxiwayIntersectionMarking.xml

 



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