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I have to calculate an average raster from 4 rasters. I have tried in ArcMap with Raster Calculator but the result is wrong. It's a line. I'm sure that I've done something wrong, but I don't know what.

How can I fix this issue?

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    You need to show us what you have tried. In raster calculator all you have to do is add the rasters and divide by the number of rasters. (X1 + X2 + X3) / 3
    – Jeffrey Evans
    Oct 9 '18 at 16:45
  • Adding images showing your raster data and the erroneous results would also help.
    – lambertj
    Oct 9 '18 at 17:29
  • Without further information, it is only speculation but, the raster calculator honors the established analysis environment. If not defined correctly you can receive wonky output.
    – Jeffrey Evans
    Oct 9 '18 at 20:37
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You could use the Cell Statistics tool if you don't want to build the expression in raster calculator and set the statistics type parameter to MEAN.

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