Faroe Islands geoid model fogeoid12 available under CC BY 4.0

[rouault]

at https://www.us.fo/kort/geodesi/

[jjimenezshaw]

Some questions about formalities:

• in which folder should it be created in proj-data? There is already a grid file for ETRS89 -> ETRS89 + FVR09 height in https://github.com/OSGeo/PROJ-data/tree/master/dk_sdfe
• What is the copyright to write here? "Faroese environment agency"?
• There is custom transformation using an older geoid model, but same vertical system. The new thing added in EPSG is https://epsg.org/transformation_11122/ETRS89-FRO-2008-to-ETRS89-FRO-2008-FVR09-height-1.html Should I keep the current (old) geoid model, and just add this one? Or should I delete the old one?

@kbevers @rouault

[kbevers]

Since dk_sdfe_fvr09.tif was added the geodetic authority of the Faroe Islands has transferred from the Danish SDFE (now KDS) to the Faroese Environment Agency (Umhvørvisstovan in Faroese), so any new additions on their behalf should be put in a fo_us folder.

It should be obvious from the CC-BY license where to attribute the copyright. Without having looked into I would say yes, it is the Faroese Environment Agency.

As far as I rembember the custom transformation was added before PROJ got the fancy EPSG integration we have today. I would suggest to keep as aligned with EPSG as possible. In this case I guess that means removing the old file and custom transformation in favour of this new file. I haven't checked but I am quite sure that dk_sdfe_fvr09.tif is the same as fogeoid12.

[jjimenezshaw]

Oh, now that you mention it, yes, they are identical. I thought it was an update. Removing the custom transformation in favor of the EPSG is easy. Renaming the file to fo_us_fogeoid12.tif and create the needed directories sounds like not giving extra value, but keep things consistent.

[rouault]

I'd suggest we don't touch PROJ-data to minimize churn here, but just update PROJ .sql files to remove the custom entry

[jjimenezshaw]

closed by OSGeo/PROJ#4729