I am working with two raster files. The first is a DEM and the second an elevation-correction file. Both files display the same geographic region. My problem is that the cell sizes of both files aren't equal. The DEM contains 5 million pixels (values), whereas the second file contains only 30 which means the cell size is much broader. My wish is to subtract the second file from the DEM. I tried using Raster Calculator but the result is not satisfying since this destroys the whole DEM.
My approach is the following: I have to use an expression within the Raster Calculator that tells the software to subtract every single DEM-cell from the corresponding value of my correction file. But unfortunately I haven't figured out how to do this... Does anyone of you have an idea how to do this?
I am using ArcGIS 10.5 and QGIS 3.4.