GS⁺ Drift

Drift is calculated as the difference between values at different sample locations within a particular lag class interval (separation distance class).  Different anisotropic directions appear on separate tabs.  Parameters for calculating drift are set in the Autocorrelation Window.
 

When the program is running, placing the mouse cursor over a graphed point will produce a box showing the number of pairs in that lag class interval, and clicking on the point will produce a Variance Cloud or h-Scattergram graph of all pairs in that interval.

Other measures of autocorrelation provided by GS+ include variograms, correlograms, madograms, rodograms, covariograms, Moran’s I, fractal dimension, and standardized, general relative, and pairwise relative variograms.