[AIXM-566] Airspace with point location for navigation warnings

ID:	AIXM-566
target version:	AIXM 5.2
version:	1.0
last updated:	28 SEP 2022
status:	APPROVED

Description

Add association from AirspaceVolume to Point with location role.

Rationale for change

See https://aixmccb.atlassian.net/browse/AIXM-221

There are many examples of “navigation warnings” published in AIP ENR 5.5, which have a simple latitude/longitude location. For example, Parachute Jumping Exercises (PJE), glider flying locations, High Intensity Radio Transmission Area (HIRTA), etc. See AIP France, Belgium, Netherlands for examples. The extent of the activity is not provided, therefore it is not possible to code a real volume for such areas.

The current AIXM 5.1.(1) model allows such navigation warnings to be encoded as instances of Airspace. However, this requires a horizontal projection (Surface) defined at least as a full Circle. An artificial radius of 1m is sometimes used, but this can be misinterpreted as an official value, which is not the case.

An additional association between the AirspaceVolume class and a Point is proposed in order to allow a simplified coding of such navigation warnings.

Impact assessment

[FWD_1:1] No data mapping is necessary and no data loss occurs when data is exchanged from a system (A) that uses AIXM 5.1.1 for output towards a system (B) that uses AIXM 5.2 for input.

[BWD_MAP_LOSS] Data mapping is possible, but some data would be lost (or converted into Notes) when data is exchanged from a system (B) that uses AIXM 5.2 for output towards a system (A) that uses AIXM 5.1.1 for input.

Change Proposal details

In the UML model:

In the AirspaceVolume class:
- add a new composition relationship AirspaceVolume isSituatedAround Point
  - 0…1 on the Point side, “location” role name, definition = “A single position used as geographical reference for the AirspaceVolume, in particular when a precise horizontalProjection is not provided.”
  - add a new “dependency” relationship from Point to SignificantPoint.

Note: this dependency is similar to the dependency relationship between Surface and SignificantPoint. It is implemented with a pointProperty, as explained in the GML Profile for aviation data.

The following UML class diagram shows the additional relationship:

Mapping AIXM 5.1.1 to AIXM 5.2 (forward)

Not applicable

Mapping AIXM 5.2 to AIXM 5.1.1 (backward)

[MAPC-00] For each AirspaceVolume that has a location element and no horizontalProjection:

add a horizontalProjection with geometry of type Circle, centred on the Point provided in the location element and with a radius of 1m
remove the location element.

[MAPC-02] For each AirspaceVolume that has a location element and also a horizontalProjection:

From the three backward mapping options discussed for this case, the first two (discard the value or use an extension) are straightforward and do not need any further details. The 3rd option (backward mapping into a Note) is detailed in order to provide a complete description of this case and its conversion option. The following mapping into Note algorithm is proposed:

Add an annotation.Note associated with the AirspaceVolume class having
purpose=“OTHER:BACKWARD_MAPPING”;
LinguisticNote.note=”location: <location//gml:pos value>
propertyName=horizontalProjection.
remove the location element.

Mapping example

(Note: for mapping test data see: https://github.com/aixm/mapping_52_511/tree/master/AIXM-xxx)

AIXM Input

AIXM Output

Backward AirspacePointNav 5.2 input
message:AIXMBasicMessage
  message:hasMember
    AirportHeliport
      gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41bb
      timeSlice
        AirportHeliportTimeSlice
          gml:validTime
            gml:TimePeriod
              gml:beginPosition = 2021-02-25
              gml:endPosition = 2021-04-22
          interpretation = PERMDELTA
          sequenceNumber = 1
          featureLifetime
            gml:TimePeriod
              gml:beginPosition = 2009-01-01T00:00:00Z
              gml:endPosition = 
          designator = KEWR
  message:hasMember
    Unit
      gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41ba
      timeSlice
        UnitTimeSlice
          gml:validTime
            gml:TimePeriod
              gml:beginPosition = 2021-02-25
              gml:endPosition = 2021-04-22
          interpretation = PERMDELTA
          sequenceNumber = 1
          featureLifetime
            gml:TimePeriod
              gml:beginPosition = 2009-01-01T00:00:00Z
              gml:endPosition = 
          type = ATCC
          designator = ATCC 1
          airportLocation =  urn:uuid:fac34bfc-fc4f-4da7-ad8a-84ee687f41bb
  message:hasMember
    AirTrafficControlService
      gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41bc
      timeSlice
        AirTrafficControlServiceTimeSlice
          gml:validTime
            gml:TimePeriod
              gml:beginPosition = 2021-02-25
              gml:endPosition = 2021-04-22
          interpretation = PERMDELTA
          sequenceNumber = 1
          featureLifetime
            gml:TimePeriod
              gml:beginPosition = 2009-01-01T00:00:00Z
              gml:endPosition = 
          flightOperations = ALL
          serviceProvider =  urn:uuid:fac34bfc-fc4f-4da7-ad8a-84ee687f41ba
          radioCommunication =  urn:uuid:fac34bfc-fc4f-4da7-ad8a-84ee687f41bd
  message:hasMember
    Airspace
      gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41bd
      timeSlice
        AirspaceTimeSlice
          gml:validTime
            gml:TimePeriod
              gml:beginPosition = 2021-02-25
              gml:endPosition = 2021-04-22
          interpretation = PERMDELTA
          sequenceNumber = 1
          featureLifetime
            gml:TimePeriod
              gml:beginPosition = 2009-01-01T00:00:00Z
              gml:endPosition = 
          type = OTHER:AMA
          geometryComponent
            AirspaceGeometryComponent
              theAirspaceVolume
                AirspaceVolume
                  location
                    Point
                      gml:pos = 34.6776728 -92.1805283

Backward AirspacePointNav 5.1.1 output
message:AIXMBasicMessage
  message:hasMember
    AirportHeliport
      gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41bb
      timeSlice
        AirportHeliportTimeSlice
          gml:validTime
            gml:TimePeriod
              gml:beginPosition = 2021-02-25
              gml:endPosition = 2021-04-22
          interpretation = BASELINE
          sequenceNumber = 1
          featureLifetime
            gml:TimePeriod
              gml:beginPosition = 2009-01-01T00:00:00Z
              gml:endPosition = 
          designator = KEWR
  message:hasMember
    Unit
      gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41ba
      timeSlice
        UnitTimeSlice
          gml:validTime
            gml:TimePeriod
              gml:beginPosition = 2021-02-25
              gml:endPosition = 2021-04-22
          interpretation = BASELINE
          sequenceNumber = 1
          featureLifetime
            gml:TimePeriod
              gml:beginPosition = 2009-01-01T00:00:00Z
              gml:endPosition = 
          type = ATCC
          designator = ATCC 1
          airportLocation =  urn:uuid:fac34bfc-fc4f-4da7-ad8a-84ee687f41bb
  message:hasMember
    AirTrafficControlService
      gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41bc
      timeSlice
        AirTrafficControlServiceTimeSlice
          gml:validTime
            gml:TimePeriod
              gml:beginPosition = 2021-02-25
              gml:endPosition = 2021-04-22
          interpretation = BASELINE
          sequenceNumber = 1
          featureLifetime
            gml:TimePeriod
              gml:beginPosition = 2009-01-01T00:00:00Z
              gml:endPosition = 
          flightOperations = ALL
          serviceProvider =  urn:uuid:fac34bfc-fc4f-4da7-ad8a-84ee687f41ba
          radioCommunication =  urn:uuid:fac34bfc-fc4f-4da7-ad8a-84ee687f41bd
  message:hasMember
    Airspace
      gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41bd
      timeSlice
        AirspaceTimeSlice
          gml:validTime
            gml:TimePeriod
              gml:beginPosition = 2021-02-25
              gml:endPosition = 2021-04-22
          interpretation = BASELINE
          sequenceNumber = 1
          featureLifetime
            gml:TimePeriod
              gml:beginPosition = 2009-01-01T00:00:00Z
              gml:endPosition = 
          type = AMA
          geometryComponent
            AirspaceGeometryComponent
              theAirspaceVolume
                AirspaceVolume
                  horizontalProjection
                    Surface
                      gml:patches
                        gml:Sphere
                          gml:rows
                            gml:Row
                              gml:pos = 34.6776728 -92.1805283

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