Groups

On the Groups tab of the Stereonet Graph form, you can adjust the display of the groups you have defined using the interactive pole grouping tools on the Chart toolbar.

The Visiblity check box allows you to temporarily hide a group so that the data within the group can be selected interactively. Note that hidden groups will be excluded when you export the stereonet display as an image.

Show Mean Pole

Select this check box to show the mean pole of the planes for each group. Note that this option is independent of the Show poles check box selection on the Display tab.

The mean pole can be denoted by a Marker symbol and a display Colour. A range of standard (Circle, Square, Diamond, Triangle, Pentagon, Hexagon, Star) marker symbols are available for selection in a drop-down list.

Show plane

Select this check box to show the mean plane of each group. Note that this option is independent of the Show planes check box selection on the Display Options tab.

Show confidence circle

Select this check box to show a Confidence circle on the graph for each group.

Show Eigenvectors

Micromine calculates eigenvalues and eigenvectors when it determines the mean orientation of each group. You can optionally select this check box to display the corresponding eigenvectors on the stereonet. Clicking on an eigenvector will display its orientation and its associated eigenvalue in the Properties window. The eigenvalues may then help you to understand the directional distribution of poles within each group:

When Axis 1’s eigenvalue is much greater than the other two axes, the poles are concentrated into a single area.
When Axis 1 and 2 have about the same eigenvalue, the poles are distributed around a great circle.
When all three axes have about the same eigenvalue, the poles are uniformly distributed.

Eigenvectors can be denoted by a Marker symbol and a display Colour. A range of standard (Circle, Square, Diamond, Triangle, Pentagon, Hexagon, Star) marker symbols are available for selection in a drop-down list.

Show plane and Show secondary plane

Select this check box to show the plane that contains the Axis 2 and Axis 3 eigenvectors. This option is different to the Show planes check box on the Display tab. You can also choose to display the secondary plane that contains the Axis 1 and Axis 2 eigenvectors.

Chart