An expanded GSLIB cokriging program allowing for two Markov models

The introduction of the two Markov models, MM1 and MM2, corresponding to two symmetric data screening hypotheses, has considerably facilitated the practice of modeling the matrix of (cross) semivariograms needed for cokriging. Program newcokb3D expands the GSLIB code cokb3D to take advantage of the colocated cokriging option under either the linear model of coregionalization (general case) or the MM1 or the MM2 model. A case study using the public domain GSLIB data set demonstrates application of program newcokb3D and analyzes the impact of the alternative models of coregionalization.