[PROJ] Anybody from Thailand?

[Javier Jimenez Shaw]

Hi

Is there anybody here with contacts in the Royal Thai Survey Department?
They claim they have a geoid model "TGM2017 geoid model" [1], but there is
no vertical CRS in EPSG.org for Thailand.
They say (at least, that is what some colleagues transmitted to me) that
they do not find it necessary.

Could anybody explain why a vertical coordinate reference system is needed
to properly use a geoid model? (it is also important without a geoid model.
Vertical systems existed before having geoid models). Adding it to EPSG is
free, easy, and more important, it helps the citizens living and working in
that country.

Thanks
Javier.

[1] https://gnss-portal.rtsd.mi.th/portal/apps/sites/#/gnss for some reason
the link there to the geoid model does not work for me
https://www.rtsd.mi.th/main/%E0%B9%82%E0%B8%84%E0%B8%A3%E0%B8%87%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%9E%E0%B8%B1%E0%B8%92%E0%B8%99%E0%B8%B2%E0%B9%81%E0%B8%9A%E0%B8%9A%E0%B8%88%E0%B8%B3%E0%B8%A5%E0%B8%AD%E0%B8%87%E0%B8%A2%E0%B8%B5/
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