Rosette Options
A Rosette plot is always initially generated using a horizontal (equatorial) base plane. North (N) will appear at the top just as in the stereonet. The rosette arcs will have the same apparent strike (= actual strike) as the great circles (planes) in the stereonet.
A Rosette plot can be customized with the following options in the Rosette Options dialog:
- Sightline Normal to Rosette
- Angular Limits
- Starting Orientation
- Scaling
- Bin Size
Rosette Options is available in Plot > Plot Options 
from the Rosette ribbon.
Sightline Normal
The default rosette is horizontal. The default normal to the base plane is therefore 000,90 indicating a line of sight directed down from above the plane.
VIEW FACE NORMAL TO ROSETTE
An arbitrary sight line normal can be specified in the Rosette Options dialog. The orientation input is the direction of sight – the base plane is positioned normal to this line. The top of the rosette will correspond to the top of the user's view.
A vertical base plane will have a normal orientation in the form of ###,00, where ### is the azimuth of the sight line normal. A horizontal rosette will have NORTH positioned at the top of the rosette. The sight line normal can be specified with a negative plunge if the rosette is to be viewed from below, looking up.
Angular Limits
The default angular limits for a Rosette Plot are 45-90 degrees. The angular limits indicate the allowable (small) angle between the base plane or face and the planes in the data set. The default range ensures that only planes that are more perpendicular than parallel to the base plane will be used.
In the Rosette Options dialog, the minimum and maximum angular limits can be set to any pair of values from 0 to 90.
Only planes within these limits will be used to generate the plot.
ACUTE ANGLE BETWEEN PLANE AND VIEW FACE
The “Acute angle between plane and view face” option for the Rosette Plot allows you to view only planes which intersect the viewing plane within a certain angular range.
The default range (45-90 degrees) ensures that only planes which are closer to perpendicular will be displayed on the rosette plot. Planes which are closer to parallel (0-45 degrees) will not be displayed on the rosette plot.
You can set this range to any pair of values between 0 and 90 degrees, although usually you would use the default range so that only planes which are closer to perpendicular would be displayed.
The viewing plane orientation is determined by the “sightline normal to rosette” which by default represents a horizontal plane (trend/plunge of normal = 0/90).
Rosette Orientation
STARTING BIN STRIKE
On a Rosette Plot, the leftmost (counter-clockwise) boundary of the first bin is, by default, at azimuth 000. This means that the bin ranges are defined at 10 degrees, 20 degrees, 30 degrees, etc. (for the default bin size of 10 degrees).
In the Rosette Options dialog, the starting point can be redefined. The rosette bins will define intervals starting from this new value. It is advisable that data be viewed from two different starting points (e.g. 000 and 005) to filter the ranking artifacts of the radial histogram procedure.
Number of Bins
The Number of Bins allows you to specify the angular range of each "bin" used to generate the Rosette Plot. The default value is 36 (i.e., 10-degree bins).
Scaling
A default scale is set automatically so that all of the rosette falls inside the circle.
To enter a user-defined scaling for the Rosette Plot:
- Select the Custom Rosette Frequency checkbox.
- Enter the desired Number of Planes per Circle Increment.
- If the interval selected by the user is too small and some segments of the rosette extend past the outer circle, those rosette segments will be truncated.
- If you are applying the Terzaghi Weighting to the Rosette Plot, note that the weighted and the unweighted Rosette Plot can each have their own independently defined scaling.