Merging overlapping rasters [on hold]


Merging overlapping rasters [on hold]



There are two rasters A and B. A is smaller but within B and since A has more up-to-date pixel values, I was able to merge A and B with "Mosaic raster layers" tool in QGIS which replaces B pixel values with A. However there is a problem, that A does have no value pixels (which are dummy high numbers), when the merge happens it overwrites B which I don't want it to happen as B has values for those missing points within A. Is there any way it could be done? It may be possible with GDAL, but I don't know how to set up the rules. Many Thanks






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