Grapher's polar plot angle axis can be labeled using numbers indicating degrees, radians, or grads.
If your wind direction data is in compass direction rather than an angle in degrees, see here: Transform compass direction to angle (degrees) in Grapher. Once your wind direction is numeric, you can follow the instructions below to display a text worksheet label to show compass direction.
- Create two columns in your worksheet for the angle direction and compass text. The Angle column contains the angle direction in degrees where the axis label should be located. The Compass column contains the label text that you would like displayed for each label.
Column A contains the angle direction.
Column B contains the label text.
- Create the polar plot as normal by clicking the appropriate Home | New Graph | Polar command.
- Click Angle Axis 1 in the Object Manager to select it.
- In the Property Manager, click the Labels tab.
- Click in the Label source field and select From worksheet.
- Click None in the Worksheet field and select your data file with the two new columns. If you created a new worksheet for the axis labels, click Browse and select the worksheet in the Open Worksheet dialog.
- Set the Data variable to the Angle column.
- Set the Label variable to the Compass column.
The graph will now show the direction labels. You can have as many or few directions as you want. Note in the original worksheet, some rows did not have labels. These are shown on the graph as tick marks with no labels. The angle value should be included anywhere a tick mark is desired.
The polar graph is displaying the compass direction instead of degrees.
If you would like the ability to add compass direction labels directly through the axis properties, please let us know!
Updated February 19, 2020
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