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[AIXM-546] Threshold displacement distance

[AIXM-546] Threshold displacement distance

Owned by georgiana.andrei04
Last updated: 2024 Aug 21 by ADAM STYLES

ID:

AIXM-546

target version:

AIXM 5.2

version:

1.0

last updated:

08 AUG 2022

status:

APPROVED


Description

A new relativeDistance attribute is added in the RunwayCentrelinePoint class. The DTHR value is removed from the declared distance type list of values.

Rationale for change

See https://aixmccb.atlassian.net/browse/AIXM-397

It was identified that the displaced threshold was modeled as a value of declared distance type, which may have created confusions.

It is proposed that a new relativeDistance attribute is added in the RunwayCentrelinePoint class to indicate the distance from the physical start of the RunwayDirection to the point. With that, the DTHR value is removed from the declared distance type list of values.

Impact assessment

[FWD_MAP_1:1] Data mapping is possible 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_1:1] Data mapping is possible and no data loss occurs 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 RunwayCentrelinePoint class add a new attribute:
    • relativeDistance, data type = ValDistanceType, definition = “The distance from the physical start of the RunwayDirection to the point. E.g. displaced threshold distance.”
  • In CodeDeclaredDistanceBaseType data type delete value:
    • ‘DTHR’

The following UML class diagram shows the deleted value and the new element

Mapping AIXM 5.1.1 to AIXM 5.2 (forward)

[MAPC-01] The following algorithm shall be applied:

  • For each RunwayDeclaredDistance element that has a child type = ’DTHR’ element
    • Replace value ‘DTHR’ with ‘OTHER:DTHR’

Note: such algorithm should preserve any Schedule that might be inherited from AIXM 5.1(.1) implementations.

Mapping AIXM 5.2 to AIXM 5.1.1 (backward)

[MAPC-01] The following algorithm shall be applied:

  • For each RunwayCentrelinePoint element that has relativeDistance child element:
    • Add a child associatedDeclaredDistance.RunwayDeclaredDistance element with
      • type = “DTHR” if RunwayCentrelinePoint.role = DISTHR ot THR
      • type = “OTHER:RELATIVE_DISTANCE” otherwise
      • add a child declaredValue.RunwayDeclaredDistanceValue element with:
        • distance = copy the value of RunwayCentrelinePoint.relativeDistance
      • Delete relativeDistance element.

Mapping example

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

AIXM InputAIXM Output