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I do have two raster layers (interpolated with Empirical Bayesian Kriging), that show the elevation of a glacier in April, and September. I want to show the change in elevation between the layers in water equivalent. Any suggestion on how I can do that?

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I'm not sure what you mean by "water equivalent". If you're just wanting to find the difference between the two rasters, it's a simple matter of subtracting the two in Raster Calculator.

Your expression will look something like this:

"September" - "April"

or

Abs("September" - "April")

You will need the Spatial Analyst extension.

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