enter image description hereQGIS is freezing on a transformation between EPSG:26912 and EPSG:3402. It appears to be looking for a grid shift file AB_CSRS.DAC which I can get from the federal government but I don't know how or where to apply it in QGIS. What am I missing?

  • How do you know it's looking for that file? If it gives you an error message, please add the text of the error message to your question.
    – csk
    Commented Jan 10, 2020 at 17:46
  • Please see attached image.
    – Mikeoramma
    Commented Jan 10, 2020 at 21:26
  • 1
    @Mikeoramma, If you have the AB_CSRS.DAC file, put it in your QGIS \share\proj folder. Commented Jan 12, 2020 at 22:40
  • More likely to get it from the Alberta government.
    – mkennedy
    Commented Jan 12, 2020 at 23:14
  • No, the federal gov creates and maintains that stuff not the province. Thanks Gabriel, that was the spot.
    – Mikeoramma
    Commented Jan 13, 2020 at 19:31

1 Answer 1


The grids are readed from the \share\proj foler.
Depending on the operating system and the installation is where it is located.

In Windows machines it is in the QGIS version folder for stand-alone default installs, or in the OSGeo4W folder for OSGeo4W default installs. In Linux it can be in /usr or in /usr/local.

If you have already the grid file, just save it in your \share\proj folder and PROJ, QGIS and GDAL will read the grid from there.

  • Thanks for this helpful answer. I want to add: for me it was still necessary to place it in the QGIS-Folder. This file existed already in the OSGeo4W folder, without resolving the error message.
    – Vincé
    Commented Mar 30, 2022 at 10:17

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