In the Stereonet Options dialog, the user can choose from two different Projection methods, which control the way in which pole points and plane traces on the reference sphere, are projected to form the two-dimensional screen image:
It is important to note the following:
All of the calculations in Dips take place on the reference sphere and not on the projection, so the choice of projection method has no effect on computed results. The two Projection methods are provided only for the customisation of the display, since different users may be more experienced in visually analysing one type of projection than the other. Each method has advantages and disadvantages, depending upon the type of analysis being performed.
It is essential that the two projections are never mixed. Decide upon one or the other, and use that projection for all data presentation and analysis on a project.