ID:	AIXM-535
target version:	AIXM 5.2
version:	1.0
last updated:	09 MAR 2022
status:	REJECTED

Description

AltimeterCheckpoint is added as a specialised class of NavigationSystemCheckpoint.

Rationale for change

See https://aixmccb.atlassian.net/browse/AIXM-115

It was identified that it is not possible to provide altimeter checkpoint information, as required by ICAO PANS-AIM, through AirportHeliport.altimeterCheckLocation. Therefore, it is proposed that a new specialised class AltimeterCheckpoint is created.

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_LOSS] No data mapping is possible, all data concerned 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:

As a specialisation of NavigationSystemCheckpoint:

Add a new class AltimeterCheckpoint with <<feature>> stereotype
- Definition = “A point established to test the altimeter readings in the aircraft.”
- Associations:
  - AltimeterCheckpoint isLocatedAt RunwayCentrelinePoint
    - 0…* on the AltimeterCheckpoint side,
    - 0…1 on the RunwayCentrelinePoint side, “location” role name, definition = “The altimeter checkpoint latitude and longitude coordinates, which are the same as for the runway threshold (runway centreline point).
  - AltimeterCheckpoint isLocatedAt AircraftStand
    - 0…* on the AltimeterCheckpoint side,
    - 0…1 on the AircraftStand side, “location” role name, definition = “The altimeter checkpoint latitude and longitude coordinates, which are the same as for the aircraft parking stand position.”
  - AltimeterCheckpoint isLocatedAt Apron
    - 0…* on the AltimeterCheckpoint side,
    - 0…1 on the Apron side, “location” role name, definition = “The altimeter checkpoint latitude and longitude coordinates, which are the same as for the Apron position.”
  - AltimeterCheckpoint hasAnnotations Note with
    - Note role “annotation” (definition = “A free text remark concerning the altimeter checkpoint or one of its properties.”), multiplicity 0…*

The following UML class diagram indicates the new class and its associations:

Mapping AIXM 5.1.1 to AIXM 5.2 (forward)

Not applicable

Mapping AIXM 5.2 to AIXM 5.1.1 (backward)

The following algorithm shall be applied:

[MAPC-99] No mapping possible. This is a new feature that has no equivalent in the current model.

Mapping example

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

AIXM 5.2	AIXM 5.1(.1)
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AIXM 5.2

AIXM 5.1(.1)

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