How would you like to process the input DEM:
Choose the processing tool you want to use.

Fill gaps is intended to fill values for gaps between rotated tectonic blocks.

Raster to be modified (Input):
Choose a raster (DEM) layer, which you want to fill gaps in.

Filling type:
If you select Interpolation, it generates elevation data in each empty pixel by interpolating from pixel values around it, using inverse distance weighting
If you select Fixed Value, the gaps will be filled with the Filling value entered below.

If you check the box Interpolate inside polygon(s) only, you have to enter a Mask layer and the interpolation will be constrained to the mask(s) from this layer.

Smooth resulting raster:
Checking this box will smooth the resulting raster. This means that the sharp edges will be less pronounced.
If you have checked the box Interpolate inside polygon(s) only, the smoothing will also be constrained to these polygons.

Smoothing type:
Select which filter will be used for the smoothing. Please refer to the manual for details about the different filters.

Smoothing factor:
You may specify a smoothing factor, which represents the radius around a given pixel that will be taken into consideration. The greater the factor, the smoother will the resulting raster be.

Output file path:
If there is no path specified here, the file will be created in the temporary folder. The full path will be shown in the Log tab and the result will be loaded to the map canvas.