This section provides "AerodromeReferencePoint" 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 AerodromeReferencePoint represents the designated geographical location of an aerodrome. This location shall be measured with required accuracy. 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 Aeronautical Data Catalogue the required type of geometry for feature AerodromeReferencePoint is 'Point'. The definition of Point can be found in the Table A1-9 Data types in the Aeronautical Data Catalogue.

AMD encoding

AIXM 5.1

ED-99 AerodromeReferencePoint is mapped in the AIXM 5.1 as property 'ARP' of feature AirportHeliport.

Geometry

In the AIXM 5.1 the geometry of the feature ARP is point encoded as object ElevatedPoint.

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 Point.

Figure 1: AerodromeReferencePoint

Time

Feature AirportHeliport with property AerodromeReferencePoint (ARP) shall be established in accordance with coding rules and requirements listed in AIXM 5.1 Temporality Model.

AIXM 5.1 features

In the AIXM 5.1 the geometry of the ARP is encoded as object ElevatedPoint. The ARP is associated from the feature AirportHeliport via the hasReferencePoint association in the AirportHeliport feature.

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

AirportHeliport feature

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

UML Diagram

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

Content of example

The following AMD properties are not covered in the AIXM 5.1. coding example: vres, hres, integr, systems, mintelev, maxtelev, avgtelev, devtelev, maxtgrad, devtgrad. 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>
</AIXMBasicMessage>

Coding example - AerodromeReferencePoint (AirportHeliport property 'ARP')

  <hasMember>
    <aixm:AirportHeliport gml:id="uuid.0b7a2688-ab95-47e6-82c2-23fe321c4a48">
      <gml:identifier codeSpace="urn:uuid:">0b7a2688-ab95-47e6-82c2-23fe321c4a48</gml:identifier>
      <aixm:timeSlice>
        <aixm:AirportHeliportTimeSlice gml:id="uuid.a03a08d1-25f9-4e10-8447-8f8e4c6e2b12">
          <gml:validTime>
            <gml:TimePeriod gml:id="uuid.56b20da6-b580-44b1-a6b7-c46f889d0fec">
              <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.e6534f0e-5a48-45ff-85e2-e91237908fbc">
              <gml:beginPosition>2020-09-01T00:00:00Z</gml:beginPosition>
              <gml:endPosition indeterminatePosition="unknown" />
            </gml:TimePeriod>
          </aixm:featureLifetime>
          <aixm:designator>LKPR</aixm:designator>
          <aixm:name>PRAGUE AIRPORT</aixm:name>
          <aixm:locationIndicatorICAO>LKPR</aixm:locationIndicatorICAO>
          <aixm:designatorIATA>PRG</aixm:designatorIATA>
          <aixm:type>AD</aixm:type>
          <aixm:certifiedICAO>YES</aixm:certifiedICAO>
          <aixm:privateUse>NO</aixm:privateUse>
          <aixm:ARP>
            <aixm:ElevatedPoint gml:id="uuid.6225f9e9-3eaf-4416-b7d2-6279c4be4b71" srsName="urn:ogc:def:crs:EPSG::4326">
              <gml:pos>50.10083333 14.26</gml:pos>
              <aixm:horizontalAccuracy uom="M">0.5</aixm:horizontalAccuracy>
              <aixm:elevation uom="M">376</aixm:elevation>
              <aixm:verticalAccuracy uom="M">0.5</aixm:verticalAccuracy>
            </aixm:ElevatedPoint>
          </aixm:ARP>
        </aixm:AirportHeliportTimeSlice>
      </aixm:timeSlice>
    </aixm:AirportHeliport>
  </hasMember>

Download feature AerodromeReferencePoint:

BL_ARP.xml

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