This section provides ‘FrequencyArea’ 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 FrequencyArea 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 FrequencyArea 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 FrequencyArea is mapped to the AIXM 5.1 as feature GroundTrafficControlService.

Geometry

In the AIXM 5.1 feature GroundTrafficControlService does not contain a property with geometry.

The geometry property for this feature is part of the extension for the AIXM 5.1 therefore the feature example (in form of attached xml file) does not contain geometry information.

GML considerations:

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

Time

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

AIXM 5.1 features

FrequencyArea is encoded to the AIXM 5.1 as GroundTrafficControlService feature.

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

GroundTrafficControlService feature

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

UML Diagram (Service / Service Overview)

http://aixm.aero/sites/aixm.aero/files/imce/AIXM51HTML/AIXM/Diagram_ServiceOverview.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, geopoly. 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:GroundTrafficControlService gml:id="uuid.35f1b425-2bad-486e-8d0e-ef43ea604e48">
  </hasMember>
  <hasMember>
    <aixm:RadioCommunicationChannel gml:id="uuid.330c6f9d-8e23-44be-a0d2-b293269e1937">
  </hasMember>
</AIXMBasicMessage>

Coding example - FrequencyArea

  <hasMember>
    <aixm:GroundTrafficControlService gml:id="uuid.35f1b425-2bad-486e-8d0e-ef43ea604e48">
      <gml:identifier codeSpace="urn:uuid:">35f1b425-2bad-486e-8d0e-ef43ea604e48</gml:identifier>
      <aixm:timeSlice>
        <aixm:GroundTrafficControlServiceTimeSlice gml:id="uuid.8547e35d-e599-49f3-84e8-4dded2c2be26">
          <gml:validTime>
            <gml:TimePeriod gml:id="uuid.12513206-c183-4dc2-bd2a-668f94965740">
              <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.015dd956-558f-4bee-a874-a6a96bf47af8">
              <gml:beginPosition>2020-09-01T00:00:00Z</gml:beginPosition>
              <gml:endPosition indeterminatePosition="unknown" />
            </gml:TimePeriod>
          </aixm:featureLifetime>
          <aixm:name>GTCS</aixm:name>
          <aixm:radioCommunication xlink:href="#330c6f9d-8e23-44be-a0d2-b293269e1937" xlink:title="330c" />
          <aixm:clientAirport xlink:href="#0b7a2688-ab95-47e6-82c2-23fe321c4a48" xlink:title="LKPR" />
        </aixm:GroundTrafficControlServiceTimeSlice>
      </aixm:timeSlice>
    </aixm:GroundTrafficControlService>
  </hasMember>

Download feature FrequencyArea:

BL_FrequencyArea.xml

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