QGIS Digital Elevation Model merging problem

Question

I am encountering the problem with merging 2 raster digital elevation model layers (.tiff).

The Qgis 3.10 returns an error as follows:

The following layers were not correctly generated.

C:/Users/mariuszk/AppData/Local/Temp/processing_9cbcbd1489014d3c90818bbf3b042cd0/processing_6bf82a76e8dc4750a515f3e1cb74f3df/f04e984630ff4005988a2ca741ed03b6/OUTPUT.tif

You can check the 'Log Messages Panel' in QGIS main window to find more information about the execution of the algorithm.

I don't know, where the problem can be.

There is a similar question here, but not resolved, unfortunately.

It looks like there is a bug in the QGIS 3.10 version, still not resolved from older versions.

The Github says, that it might be a bug:

Is there another way to make this merge?

Please post the real error message from the protocol. Also check whether your installation is correct. — Erik, Jan 31, 2020 at 12:03
Great, you copy-pasted the same text which is in your screenshot, while the information from the protocol is probably the one we need. — Erik, Jan 31, 2020 at 12:07
So to looks like I don't know where is the protocol then. In the Parameters in the GDAL/OGR section I found: python3 -m gdal_merge -ot Float32 -of GTiff -o C:/Users/mariuszk/AppData/Local/Temp/processing_9cbcbd1489014d3c90818bbf3b042cd0/processing_6bf82a76e8dc4750a515f3e1cb74f3df/d94ff82c5ea7400db5ad0ed812ae872c/OUTPUT.tif --optfile C:/Users/mariuszk/AppData/Local/Temp/processing_9cbcbd1489014d3c90818bbf3b042cd0/processing_6bf82a76e8dc4750a515f3e1cb74f3df/fbbd57bd798e40da84ba009af41027c2/mergeInputFiles.txt — Geographos, Jan 31, 2020 at 12:16
As stated in the error message you copied: "check the 'Log Messages Panel'". — Erik, Jan 31, 2020 at 12:17

Geographos · Accepted Answer · 2020-02-11 15:39:50Z

After launching the QGIS 3.8.3 desktop via OSGeo instead of QGIS 3.10 I found, that everything is working.

The bug exists in some 3x versions, as described on the GitHub:

Alternatively is an option to merge the DEM files in the SAGA as per the link below:

written in Polish, but the SAGA interface screenshots are in English.

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