[Therion] PROJ error - no usable coordinate transformation found (not matching proj.db file version)

[Martin Budaj]

Hi,

try the updated installer from the latest commit
(https://github.com/therion/therion/actions/runs/12736026010). You
need to be logged in to Github to be able to download it.

M.

On Sun, Jan 12, 2025 at 2:28 PM Alexandru Pologea via Therion
<therion at speleo.sk> wrote:
>
> After installing therion 6.3.3 (and Survex 1.4.15) on Windows 10 Pro, I
> get this error:
>
> "no usable coordinate transformation found"
> Full log here: https://pastebin.com/Dkn95nzE
>
> It seems that Therion uses the PROJ installation from my QGIS
> installation (QGIS updated the PROJ path and it points to proj.db file
> path from QGIS's PROJ package).
>
> After installing updated PROJ separately using << osgeo4w-setup.exe -q
> -k -r -A -s https://download.osgeo.org/osgeo4w/v2/ -P proj >> I get a
> similar error. This time it doesn't find the proj.db file at all:
> https://pastebin.com/TcEDbKmF
>
> It seems like Therion/PROJ library is using the path defined in the
> PROJ_LIB path variable so you need to set it back to the proj.db file
> version path that comes in the therion installation directory, in my case:
> SET PROJ_LIB="C:\Program Files\Therion\lib\proj-9\"
>
> You can set this globally or for the current batch session only if you
> don't want permanent path modification, in case QGIS or other software
> need it as it was before. If you want to see details on errors from PROJ
> library, you can set a debug flag
> SET PROJ_DEBUG=3
>
> Is there another fix?
> Maybe a future fix would be for Therion to use it's PROJ distributable
> instead of the default one in the system, if possible.
>
>
> Alex
>
>
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