Hi, if I understand well, you are trying to adjust the superposition raster pixel values in order to show up the contamination for the cases you have contamination in one of two grids but when you do the sum of their contamination limit intervals values, it disappears. I guess, if you fix 85 (42+43) as a limit for a contamination class of the superposition grid, and you have values greater than 42 (image 2) and less than 43 (image 1), your superposition grid (image 3) will not show the contamination represented by the values greater than 42 of image 2 and the values less than 43 of image 1 because their sum is less than 85 (for example 45+30=75). I think your conditions are good, I don’t know why it doesn’t work.
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