GS⁺ Variograms

Variograms produced by GS⁺ appear initially in the Autocorrelation Window.  By pressing the Enlarge command in that window, a full-window variogram like the one below is created. From this window the variogram can be edited and printed. Additionally, the semivariance values that were used to produce the variogram can be listed, and Variance Cloud and h-Scattergram analyses provide a way to detect outlier pairs of points that may be artificially skewing the variogram (such as the point under the cursor at the 7th lag class, below).

Different anisotropic directions appear on separate tabs.  Parameters for calculating variograms are set in the Autocorrelation Window, where it is also possible to access the Model Definition window to adjust the modeled line drawn amongst variogram points.

When the program is running, placing the mouse cursor over a variogram 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 correlograms, madograms, rodograms, covariograms, drift, Moran’s I, fractal dimension, and standardized, general relative, and pairwise relative variograms.