The majority of evaluation methods come from general decision theory and embrace spatial variability only implicitly. For instance, in GIS-based weighted overlay, the decision maker de facto performs traditional weighting by assigning the same importance value to every spatial unit of a given criterion layer. Within this category of SA methods, the major factors analyzed relate to: the diversity of choice alternatives, the choice of attributes, the stability of solution to changes in weights, and the uncertainty of evaluation method.
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