I am trying to create a easy way to do raster analysis by building a model for two way raster calculations. I have two raster layers that I want to combine into a single raster. For now I've done this manually by doing the raster calculation myself but for the future I want to be able to input these layers into a model without having to go through the trouble.

What is the proper annotation of this formula?

How I've tried it is not working.

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Since you are using the SAGA provider raster calculator, you need to use the SAGA syntax, which is: (g1+g2)/2


Try (A+B)/2, or refresh your Processing plugin.

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