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This is a question related to an earlier one of mine (Reclassifying multiple rasters in ArcGIS Desktop?). I want to sum up 162 rasters: I tried to load them all into ArcMAP in order to eventually use Raster Calculator, but I have 2 issues:

  1. ArcMap seems to get stuck as I try to load hundreds of rasters;
  2. I would be forced to write by hand a very long sum into Raster Calculator.

Is there a way to circumvent those issues, i.e. to summing all the rasters without Raster Calculator and/or without writing a very long sum formula?

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    Cell statistics does it on the fly – FelixIP Jan 23 '17 at 9:31
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Try Mosaic to New Raster with method sum for overlaying rasters. You can select layers, don't have to write long expression.

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