ID: | AIXM-546 |
target version: | AIXM 5.2 |
version: | 1.0 |
last updated: | 08 AUG 2022 |
status: | APPROVED |
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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
When receiving data from 
[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 ) implementations, for output towards a system (B) that uses AIXM 5.2 systems will have to be able to map the data according to the forward mapping rules further in the document.When receiving data from AIXM 5.2 implementations, current 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) systems will have to be able to map back the new attribute as laid down in the backward mapping rules further in the document.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.
- Add a child associatedDeclaredDistance.RunwayDeclaredDistance element with
Mapping example
(Note: for mapping test data see: https://github.com/aixm/mapping_52_511/tree/master/AIXM-xxx)
| AIXM 5.2Input | AIXM 5.1(.1)Output |
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