I'm trying to merge two grids with different cell size. One has a cell size of 10m and the other 50m. The 10m one covers a subarea of the 50m one. I know that the most accurate one is the 10m one and hence I would like to keep its values in the overlapping areas, and not do any kind of interpolation. My problem is that the resulting merged grid (after resampling the 50m grid to 10m) has obvious step changes as seen in the picture
Is there a way I can feather out these discrepancies without editing the grids cell by cell? I'm using Qgis and Saga.