I have raster data (1km resolution) of nationwide multiannual precipitation. Unfortunately, the raster layer does not completely cover the extent of an underlying vector layer (see picture below).
I would like to interpolate the original raster values to a slightly bigger raster layer, which completely covers the vector layer.
My approach (conversion of raster values to points and interpolation of point values to a new raster layer with a bigger extent) has not been very straightforward. I guess, there is a better way.