Anisotropy

Experimental calculations can reveal a very different behavior of the experimental variogram in different directions. This is called an anisotropic behavior. As variogram models are defined for the isotropic case, we need to examine transformations of the coordinates which allow to obtain anisotropic random functions from the isotropic models. In practice anisotropies are detected by inspecting experimental variograms in different directions and are included into the model by tuning predefined anisotropy parameters.