Variograms An important component of the kriging gridding method is the variogram. Click OK in the Grid Data dialog and a grid file is produced using the kriging gridding Click OK in the Kriging Advanced Options dialog to return to the Grid Data dialog. (Faults are no longer supported with kriging.) For more information on breaklines, see the Breaklines and Faults section beginning on page 111.Ĩ. The Breaklines page is used to add breaklines to the gridding process. For more information on search, see the Search section beginning on page 103.ħ. The Search page allows you to specify search rules. Drift type None is ordinary kriging, while Linear and Quadratic drift types are universal kriging.Ħ. ! You can select a Linear or Quadratic drift type. For more information on Point or Block Kriging, see the Kriging Type section. ! Choose Point or Block Kriging from the Kriging Type box. See Kriging Standard Deviations for more information on this subject. ! Click the button to enter a file name into the Output Grid of Kriging Standard Deviations box. You must have the variogram open in the current plot window to use the Get Variogram option. The Get Variogram button extracts the current variogram model and inserts it into the kriging variogram model. ! If you have modeled your data with Surfer's variogram modeling feature (Grid | New Variogram), click the Get Variogram button to use the variogram results. ! To remove a component from the variogram model, highlight the component in the Variogram Model group, and then click the Remove button. Once you are finished editing the components, click OK to return to the Kriging Advanced Options dialog. You can edit various parts of the variogram model from this dialog. ! Click the Edit button to display the Variogram Components dialog. Refer to the Variograms section for more information on the variogram components. ! Click the Add button to add variogram components.
Click the Advanced Options button to display the Kriging Advanced Options dialog. In the Grid Data dialog, choose Kriging in the Gridding Method group. In the Open dialog, select a data file and then click the Open button. Kriging Advanced Options To set advanced kriging options: 1. It incorporates anisotropy and underlying trends in an efficient and natural manner. Within Surfer, kriging can be either an exact or a smoothing interpolator depending on the user-specified parameters. You can accept the kriging defaults to produce an accurate grid of your data, or kriging can be custom-fit to a data set by specifying the appropriate variogram model. Kriging is a very flexible gridding method. Kriging attempts to express trends suggested in your data, so that, for example, high points might be connected along a ridge rather than isolated by bull's-eye type contours. This method produces visually appealing maps from irregularly spaced data. Kriging Kriging is a geostatistical gridding method that has proven useful and popular in many fields.
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