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In QGIS raster calculator I do:

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Plus (+)

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And I get:

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The red circle in the middle is like cut in the result, QGIS it's not adding every pixel on each raster, it makes a kind of intersecction...

If i select in the QGIS layer selector the two layers to be added (using blending effects = multiply) i get visually pretty much what I spected to see when making the raster calculation adding:

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How could I make a real adding calculation between two rasters?

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Try to replace your Nodata values with 0 and repeat your calculation. To do that you could try: Change NODATA pixel value in raster to arbitrary value.

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