How to determine the wind direction?

Let's talk about wind direction first: the unit of measurement of wind direction, expressed in azimuth. On land, it is generally represented by 16 directions, and at sea, it is represented by 36 directions. At high altitude, it is expressed by angle. To express the wind direction by angle means to divide the circumference into 360 degrees, the north wind (n) is 0 degrees (that is, 360 degrees), the east wind (e) is 90 degrees, the south wind (s) is 180 degrees, and the west wind (w) is 270 degrees, and the rest wind directions can be calculated from this. In the forecast of the Central Meteorological Observatory, there are symbols on the big screen: it looks like an F, in which the "tail" (vertical downward) indicates the wind direction; "stem" (horizontal on the right) indicates the magnitude of wind power, and Stem is directly proportional to wind power. In order to express the wind frequency in a certain direction, it is usually expressed by the wind direction frequency, which refers to the percentage of the wind frequency in a certain direction in all directions in a year (month), that is, wind direction frequency = wind direction frequency/wind direction total observation frequency × 100% is calculated by wind direction frequency. According to observation, northerly winds (north wind, northeast wind and northwest wind) often blow in North China, Yangtze River basin, South China and coastal areas, and southerly winds (south wind, southeast wind and southwest wind) often blow in summer. Unfortunately, I don't have any photos in my hand now. I hope I can help you.