Variograms

This Variogram Display and Modeling functionality has the following features:

Uses the Datamine Charting framework which is shared by the Histograms, Scatter Plots and Stereonet options.
Report-quality graphics that can be saved as standard image files (.jpeg, .gif, etc) or as plot items in the Plots window.
Ability to save one or more 'variogram display and modeling scenarios', each as a single case with all its parameters.

Note: A case is set up by creating a new variogram chart sheet, represented by a single tab in the Plots Window.
The simultaneous opening of multiple cases, together with Histogram, Scatterplot and Stereonet charts.
Selection of multiple experimental variograms from one or more files created by the variogram calculation process (VGRAM).
Selection and display of experimental variograms using up to three key fields.
Interactive model fitting by dragging control points with the mouse or by typing parameters into dialogs.
Fitting of anisotropic models in a single window, or in three individual windows with full linking of common parameters.
Choice of model type for up to five structures.
Detailed formatting options to specify axes, annotation, titles, line styles, colors, etc.
Display of variogram rotation angles in either the world coordinate system, or relative to a rotated plane.
Choice of display of variogram, relative variogram, log variogram or covariance. Any of which can be normalized.
Creation of a wireframe ellipsoid from the variogram model, to aid in visualizing variogram ranges and axis rotation angles.

An example of a variogram chart

Note: Experimental variogram data is generated by the VGRAM process, and also as part of advanced estimation functions in Studio RM.

The Variogram Screen

To display this screen:

In any data window, activate the Estimate ribbon and select Variograms >> Fit .

The Variogram screen controls aspects of histogram display, formatting and modeling. The screen consists of two main areas: a preview area on the left and a controls area on the right.

The Preview Area

The preview area is used for:

Previewing the current settings for the displayed variogram(s).
Interactive model fitting.
Interactive positioning of the following chart components:
- Chart title box.
- Variogram model parameters box.
- Legend box.

The Controls Area

The control area, on the right is, divided into the following tabs:

Data Selection: load and display experimental variograms from one or more files.

See Variograms: Data Selection.
Format: configure the variogram chart's Annotation, Axes, Grid, Comments, Colour, Legend and Options parameters.

See Variograms: Format.
Charts: control the display of loaded variograms using the folder tree.

See Variograms: Charts
Data: view the lag details for the selected variogram.

See Variograms: Data
Model Fitting: fit a model to the current variogram chart.

See Variograms - Model Fitting

Create a Variogram Chart Sheet

To create a new variogram chart sheet, for displaying and modelling:

Display the Variogram screen.
As a minimum, in the Data Selection tab, load an experimental variogram file(s), and define the associated parameters and click Apply.

Note: You'll need an experimental variogram file for this, typically created using VGRAM or as part of advanced estimation.
If a variogram model is to be created, in the Model Fitting tab, specify a model file and define a set of model parameters.