Create a rose diagram

The option Rose Diagram is designed to display the output of the Segment direction histogram operation in graphical format.

With the Segment direction histogram operation you can analyze the patterns of the line features in a segment map; the direction, length, and frequencies of segments without intermediate points or within segments (i.e. in between all intermediate points) are calculated.

The results of the Segment direction histogram operation are stored in a table. For a better understanding of the values, it is advised to create a rose diagram.

To create a rose diagram / this dialog box appears:

when you open the output table of the Segment direction histogram operation, and choose the Create Rose Diagram command from the File menu in the table window,
when you choose the Create Rose Diagram command from the File menu in the Main window,
when you double-click the New Rose Diagram item in the Operation-list, or
when you click a table with the right mouse button in a Catalog, and choose Create Rose Diagram from the context-sensitive menu.

Dialog box options:

Table:

Select a table which contains the columns that you wish to show as a rose diagram.

Angle:

Select column 'Direction', or select any other value column which represents angles (X-axis).

Note: The column used for the X-axis of a rose diagram is supposed to contain values between 0-180° or between 0-360°.

Value:

Select either column 'Length' or column 'NrSeg', or select any other value column to be used as Y-axis.

The rose diagram will be displayed in a new graph window.

Tips:

To edit the appearance of the rose diagram, double-click the rose diagram layer in the Graph Management pane: the Graph Options - Rose Diagram dialog box will appear.
To adapt the title, X-axis, or Y-axis of the rose diagram, double-click the appropriate item in the Graph Management pane or in the graph window itself: the Title, X-axis (rose diagram), or the Y-axis (rose diagram) dialog box will appear.

The grid lines of the rose diagram can be modified in the X-axis and Y-axis dialog boxes.

To add another rose diagram to an existing rose diagram displayed in a graph window, choose Add Graph from the Edit menu in the graph window. You can also click the Add Graph button in the toolbar of the graph window: the Add Rose Diagram dialog box will appear.

Examples:

Figure 1 below shows a rose diagram of the Faults in segment map Faults of the example data. The X-axis shows the direction of the Fault segments, the Y-axis show the length of these segments in a certain direction.

Fig. 1: Rose diagram showing directions and lengths of Faults.

Figure 2 below shows a rose diagram of the Lineaments in segment map Faults of the example data. The X-axis shows the direction of the Lineament segments, the Y-axis show the length of these segments in a certain direction.

Fig. 2: Rose diagram showing directions and lengths of Lineaments.