This is a wind rose map. This type of map is used to communicate the direction and speed of the wind. There are 8 possible directions that a branch could point. If a branch is pointed N, NE, E, SE, S, SW, W, or NW, this means that wind is detected in that direction. The thickness and the length of the branch are also important symbols. The thickness represents the wind speed ranges and the length is proportional to the frequency of the winds.
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