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I am trying to generate a raster layer from the subtraction of a DSM raster layer and a DTM raster layer. Both my DSM and DTM are in float64 data type. When I run the raster calculator to do the subtraction, I could not specify the data type of the output and the default output that I got was in float32 after subtraction. Is there an option and button to specify the output data type?

I am using QGIS 3.0.

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The Raster calculator from the menu toolbar does not have the option to specify the output raster type.

But if you go to the Raster calculator from Processing toolbox -> GDAL -> Raster miscellaneous -> Raster calculator, it will give you the option to specify the Output raster type as you can see below:

enter image description here

  • Unfortunately not anymore in 3.6 – christian.gobel Mar 25 at 15:12
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    @christian.gobel Specifying the output type is still there in both QGIS 3.4.5 and 3.6. Use the Raster calculator under the GDAL -> Raster miscellaneous not the one under the Raster analysis. – ahmadhanb Mar 26 at 0:58
  • you are right. Thanks. Both tools use the same syntax, with the exception that miscellaneous refer to each layer as A,B...? Right? – christian.gobel Mar 26 at 22:01

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