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It seems that the solution previously given does not work anymore:

How to use gridfiles (*.gsb) in QGIS

Does someone know how to add new transformations in using gridfiles *.gsb in QGIS 3.10?

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  • Maybe this problem is related to that bug github.com/qgis/QGIS/issues/32795 ? Nov 13, 2019 at 10:37
  • After some investigations, it seems that QGIS 3.10.0-2 is only using the transformations saved in "C:\Program Files\QGIS 3.10\share\proj\proj.db" and does not take into account what is in "C:\Program Files\QGIS 3.10\apps\qgis\resources\srs.db" The question is then : how to add a new database or how to modify the one used by default? Nov 13, 2019 at 11:15

1 Answer 1

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It seems this bug is fixed with the new version Qgis 3.10.2.

In the CRS menu in the "Default Datum Transformations" I got a suggestion to download the transfornation grid I needed (proj-datumgrid-europe-1.5) here => https://download.osgeo.org/proj/?C=M&O=D

Then I unzipped the file to the right directory (C:\Program Files\QGIS 3.10\share\proj). This directory could be located under C:\OSGeo4W64\share\proj, depending on how you installed Qgis on your PC.

After a restart of Qgis, it worked!

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