Cross Variogram

The Cross Variogram operation calculates experimental semi-variogram values for two variables and cross-variogram values for the combination of both variables. As input for the Cross Variogram operation, you can use a point map with a linked attribute table containing at least two value attribute columns. The Cross Variogram operation is a multivariate form of the Spatial correlation operation.

From the output table of the Cross Variogram operation, you can create semi-variogram models for both variables and a cross-variogram model for the combination of the variables (Graph window : Add semi-variogram model). All three models serve as input for the CoKriging operation. CoKriging calculates estimates or predictions for a poorly sampled variable (the predictand) with help of a well-sampled variable (the covariable). The variables should be highly correlated (positive or negative).