I got to DEM layers over the same area with positive and negative values in them. So I ran a raster calculator raster1-raster2. Now the raster got values with 0,000659 (This should be counted as 0,00, I just want 2 decimals) and so on. I would just like to display values that are bigger or smaller than 0,00 either by symbology or by doing a new calcuation and extracting all values that are not equal to 0,00.

Using Qgis

  • Did you try using a round() function in your computations? Feb 14, 2020 at 11:50

1 Answer 1


Let's say your DEM layers have the names DEM1 and DEM2. The following expression (in the QGIS Raster Calculator) returns 0 for the differences that have an absolute value that is less than 0.005, and the calculated difference larger absolute differences:

"DEM1@1" - "DEM1@1" * (("DEM1@1" - "DEM1@1" > 0.005) OR ("DEM1@1" - "DEM1@1" < -0.005))

  • 1
    This workt perfect. Thank you!
    – Linkinpark
    Feb 18, 2020 at 13:36

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