QGIS 3.22 Georeferencer – Fixing Coordinate Reference System Selector Not Showing Issue

georeferencingqgisraster

I'm using QGIS 3.22 trying to go through the 3.16 training manual – 14 Module: Forestry Application – When following the manual instructions after opening the Georeferencer and loading the raster, instead of showing the "Coordinate Reference System Selector" I got an error message CRS was undefined: defaulting to project CRS EPSG:3067 - ETRS89 / TM35FIN(E,N).

After reviewing the literature I could not find the "options" tab where to check the "show CRS"

Best Answer

The look of the georeferencer may have changed since the tutorial was written. No automatic prompting happens but user must load the image and open the raster settings

Press the globe icon and select the coordinate reference system

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If you look at the ground control points in the generated gdalwarp command you should see that they do not make sense.

     pixel   row     x        y 
-gcp 324.814 728.712 11.3582 43.5428 
-gcp 354.101 637.672 11.3582 45.5428 
-gcp 476.351 216.605 11.3586 43.5427 
-gcp 518.207 168.548 11.3585 43.5426 
-gcp 342.315 362.074 11.3585 43.5428

Two of the points have exactly same coordinates but still different pixel/row. Three other points have almost identical coordinates.

The reason may be that QGIS is automatically truncating coordinates at fourth place which is too coarse for you. As a workaround measure your Ground Control points in EPSG:32632 units or measure as EPSG:4326 but convert to EPSG:32632 for QGIS. You can do that with gdaltransform http://www.gdal.org/gdaltransform.html.

gdaltransform -s_srs epsg:4326 -t_srs epsg:32632
11.3582 43.5428
690515.193804498 4823796.38860415 0

Alternatively, if you have accurate EPSG:4326 coordinates you can edit the gdal_translate command by hand and run gdal_translate directly from the command shell.

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