Most geostatistical studies have multiple variables that are spatially correlated with one another. In order to properly assess uncertainty in response variables such as resources in place, this correlation needs to be accounted for in a simulation workflow. This is accomplished through cosimulation. With the current GGS simulation method used in ArcGIS an LU or other matrix approach could be used to correlate the unconditional realizations before the conditioning by kriging step.
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