I am making a prospective map of fossil deposits using the "Weighted Overlay" ArcGIS tool. Input factor rasters are mostly topographic in nature (elevation, roughness, TPI, etc). Initially, I had planned on assigning the weightings of each factor based on expert opinion. However, due to the large number of input rasters it is now apparent that a less subjective, statistical technique of determining these weights would be preferable. I want to know if the analytical hierarchy process (AHP) can be suitably applied to determine the weights of the input rasters in this case.
If not: can you suggest any other methods to reduce the subjectivity of the designation of these weightings?
I am using ArcGIS 10.2