In order to determine the actual areas in each category, I had to convert each of my raster layers to Integer from floating type.  

 

This is the output of the fixed multicriteria evaluation, after using the Int (spatial analyst) tool, and reclassifying the unique values into 5 classes 

 

It was made from combining the four raster layers in a Weighted Sum procedure.  The four layers include:

 

•  Soil Texture (unchanging)

• Slope (unchanging)

• Precipitation (for 1990-1999 and 2090-2099)

• Temperature (for 1990-1999 and 2090-2099)

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each of these layers was assigned a weight based on an Analytical Hierarchical Approach (AHP) 

 

Criteria	Weight /100
Temperature	50
Precipitation	30
Texture	10
Slope	10

 

 

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