风向玫瑰图显示了不少东西。风玫瑰的目的是帮助你理解的频率、强度和方向_from_风。为什么风_from_方向,而不是_to_ ?他们常常被用于建筑设计的可视化数据,我们关心的是抵制加载,所以我们使用风来自的方向。他们也用于气象:不同的风带来不同的天气(北风是冷在北半球),所以使用_from_是有意义的。飞行员关心风他们会遇到起飞或降落,所以他们想知道他们必须抵制。有很多原因,其中一些讨论https://en.wikipedia.org/wiki/Wind_rose。一些其他的事情要知道你看图表:——这个图表是基于时间序列的风的位置。——数据被放置(“封存”)到风速范围,范围和方向。例如,记录12.6公里/小时的风速和风向92°将放入到16公里/小时风速范围,范围和W方向。 This makes it much easier to take in the results. - The different coloured lines are for the different wind speed ranges, measured in kilometers per hour. - Winds are shown in small sectors of wind direction. In this plot the bins are 22.5°, which corresponds to 16 subdivisions of the compass rose. - The distance from the center of the rose gives the frequency of winds in each wind direction sector; this is why the north axis has a number on it that increases from 0 to 4000; this is the number of records. To use the wind rose, you can start by looking at winds of a certain speed range, for example the pale green series. This is winds in the range 7-11 km/hr. Now, follow it clockwise around the plot. You see that there is a peak in winds with a speed of 7-11 km/hr to the north, another to the E, and also a lot of 7-11 km/hr winds between WNW and SSE. You could also look at a particular wind direction, for example for winds from the west. Maybe your building has a very exposed west wall? Anyway, you would see then that the most common winds are in the range 7-11 km/hr (green line), followed by 11-16 km/hr (purple), then 4-7 km/hr (red), then 0-4 km/hr (blue), and so-on. If we wanted to, we could get the relative frequency of winds in this sector by looking at the distance from the center of the plot for each line and dividing the distance for one line by the sum of all lines in that direction sector. We can also see some information about the maximum wind speed. For example, there are no winds over 22 km/hr at this location, because there is no orange line. But, there is a light blue line, which shows winds from 16-22 km/hr, so we can say that the maximum wind speed that's been see at this location is less than 22 km/hr, but more than 16 km/hr. This wind rose is quite hard to use. Often we would plot the wind speeds as stacked bars so that you can see what is the direction from which winds come most often. This is used in wind energy, for example. See http://stackoverflow.com/questions/17266780/wind-rose-with-ggplot-r for an example of a different way to show this data.