AIRM alignment

[blchoy]

I am attaching a paper (METP4-WP3104_AIRM_Alignment.pdf) which will be discussed in the upcoming METP4 with regard to aligning IWXXM with AIRM. As discussed with @braeckel, we will wait for the outcome of the meeting before deciding how to proceed.

[blchoy]

This is the draft outcome of the meeting: @braeckel : We may want to discuss how to make IWXXM "allowing the AIRMET and SIGMET weather condition motion to be defined in degrees from true North and/or cardinal directions".

[blchoy]

Checking AIXM, its AngleIndication Class (https://ext.eurocontrol.int/aixmwiki_public/bin/view/AIXM/Class_AngleIndication) carries placeholders for both bearing and cardinal directions. The remaining question is whether we want to do similar things in IWXXM or not:

<iwxxm:SIGMET ...>
   ...
   <iwxxm:directionOfMotion>
      <iwxxm:cardinalDirection>E</iwxxm:cardinalDirection>
   </iwxxm:directionOfMotion>
   ...
</iwxxm:SIGMET>

or

<iwxxm:SIGMET ...>
   ...
   <iwxxm:directionOfMotion>
      <iwxxm:angle angleType="TRUE" uom="deg">90</iwxxm:angle>
   </iwxxm:directionOfMotion>
   ...
</iwxxm:SIGMET>

[porosnie]

Please note that there is a change proposal for AIM 5.2 that will replace the AngleIndication (feature) with a new Angle (object). I think that the possibility to use a cardinal direction will be retained in the new model. You can see the draft change proposal here: https://drive.google.com/open?id=1zXTOqFlVGRkT5t_IFISGKAJy5aeQj37qoKxcVMYOA4I

[blchoy]

Thanks @porosnie for pointing out. FIXM does not seem to like cardinal directions (only fb:bearingType is available. See this page).

[blchoy]

I have prepared a draft response to the items here which I hope has incorporated the essence of Aaron's comments. Items 4, 5 and 8 are minor changes to the notes in the schema and will be included in 3.0.0RC2. I will leave the rest for the team to discuss.

[blchoy]

A paper was presented on this topic at the joint ICAO WG-MIE and WG-MRI workshop. It is anticipated that more interactions should be arranged between the WMO TT-AvXMl and the ICAO METP working groups to facilitate better alignment of ATM concepts with MET domain knowledge.

[blchoy]

We finally figured out what and how to align with AIRM and a paper will be presented at the upcoming ICAO METP WG-MIE/6. This thread had served its purpose and follow up issues will be raised and followed in separate threads.