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Merging 4 raster layers into 1 + avoiding overlaps

Question asked by geonetadmin on Nov 24, 2013
Latest reply on Nov 26, 2013 by jimcousins
Original User: masa8187

I have four raster layers that all represent different soil types. Now I want to merge them into one single layer with four different classes. I have been told that I can use Raster Caculator for this - but which expression should I use?

I also need to find a way to eliminate any overlapping where more than one class is identifiable in the same area. Is there a way to "rank" the classes? An area covered by class 1 and 2 should be classified as 1, areas covered by class 2, 3 and 4 should be classified as 2 and so on.

In the end I want one shape-file with four different non-overlapping classes.