I need to overlay 16 black & white rasters to show their level of overlap. Ideally, as the output, I would want a new raster with a range of 0-16 (i.e. 0% overlap to 100% overlap). I tried doing this with the SAGA raster calculator (followed this advice: Calculating percent overlap of Raster Layers using QGIS?) but it did not work. I also tried combining them in the SAGA mosaic tool, but QGIS crashed every time. Is there a different method I could try?

  • Maybe start trying it step by step combining two rasters, not all 16 at once...
    – Babel
    Apr 8, 2022 at 13:41

2 Answers 2


Use the QGIS Cell Statistics tool:

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  • Thank you! I figure out that I could do it using r.series and managed to get a perfect raster file that shows the overlap :)
    – geogalog
    Apr 11, 2022 at 12:33

I figured out the solution: using r.series and specifying it to use the sum of the 16 rasters. I got an output raster that shows the level of overlap.

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