A wind rose depicts the wind frequency in specified wind direction sectors and wind speed classes for a given location and time. Over the years, thousands of people in need of wind roses have turned to Lakes Environmental’s freeware application, WRPLOT View. Beginning with WRPLOT View Version 8.0, users now have the ability to define custom wind direction sectors. By changing the sector arcs and starting angles, users can analyze a wide variety of wind statistics.
To customize the wind direction sectors, open your met data file in WRPLOT View and select the Tools | Wind Rose Sectors menu option.
The application defaults to 16 sectors centered on 22.5-degree intervals (e.g., 0°, 22.5°, 45°, etc.). To modify the sector positions, edit the Start Angle field. For example, if I wanted to start the sectors at the North compass point, I could start at 0° and go up by 22.5° increments.
Default wind sectors
Custom wind sectors
Users can also define non-uniform arcs.
Wind rose plot with 4 non-uniform sectors and uniform petal width