Dear Shwei Lin,
I'm trying to reach to a conclusion here.
As you know there was a parallel discussion on this by email, which I try to summarize below:
- it has been agreed that a new WSI for the upper air station is needed,
- in terms of assigning a WSI to the upper-air station, your ISO country code should be used as Issuer of Identifier, as proposed approach described under 1. in your message,
- regarding your proposed approach described under 2. in your message (to retain the 5 digit ID value as the local identifier) there is still no clear guidance, since there might be advantages (enable some continuity) and disadvantages (might cause confusion for data users).
I hope this correctly summarizes the discussion, however, any additional comments, suggestions are welcome!
Thank you, kind regards
Luis