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Raster calculator addition problems


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I was trying to add several raster layers with values 0 and 1 using raster calculator. The raster layers have different spatial extents so i used the layer with maximum area as the processing extent in the calculator. But the results are weird and range of results are ranging from -2000 to +2000. Why is it so or am i missing something important while doing raster additions? Please drop in your comments.

Thanks in advance,


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