Directional rose

A directional rose shows the frequency of winds or waves coming from particular directions.

The length of each colored spoke in the directional wave rose above is related to the percentage of time that the waves arrive from that particular direction. Each concentric circle represents a different frequency, emanating from zero at the center to increasing frequencies at the outer circles. Each spoke is broken down into color-coded bands that show wave height ranges. Directions follow the nautical convention.

In the above example, most waves (more than 35%) arrive from the southwest, almost 20% of the time waves come from the south and about 10% of the waves come from the west. About 30% of the time, waves come from the southwest and are below 5m.

The number of colored spokes around the circle is fixed and set to 16 (22.5 degree sectors). The colored segments represent wave height (or wind speed) classes. Here, wave height class width was set to 1m. Note that the number of segments is fixed and set to 9: the last segment contains samples larger than 8 times the class width.

Any dummy directions are treated in the same way as for 2D scatter tables.

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