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Data expansion
Wind is a natural phenomenon caused by airflow. Scientifically speaking, wind often refers to the horizontal motion component of air, including direction and size, that is, wind direction and wind speed; But for flight, it also includes vertical motion components, so-called vertical or ascending and descending airflow. Strong winds can move objects and their directions (mass of matter). The wind is very fast. The strength of the wind is expressed by the wind speed, generally measured by the size of the wind or how many meters/second, which is divided into thirteen levels.
The horizontal movement of air is called wind. Wind is a physical quantity representing the movement of airflow. It has not only the size (wind speed), but also the direction (wind direction). So the wind is a vector. Wind direction refers to the direction of the wind.
The surface wind direction is indicated by 16, and the wind direction in the upper air is usually indicated by azimuth degrees, that is, 0 (or 360) means due north, 90 means due east, 180 means due south, and 270 means due west. At azimuth 16, the angular difference between each adjacent azimuth is 22.5. Wind speed is usually expressed in meters per second, knots and kilometers per hour.
Wind direction refers to the direction of airflow, which is often recorded in the direction of 16. Wind speed is the horizontal distance that air moves in unit time, in meters per second. The horizontal wind speed in the atmosphere is generally 1.0 ~ 10 m/s, typhoons and tornadoes can sometimes reach 102 m/s, and the wind speed in farmland can be less than 0. 1 m/s.
There are two kinds of observation data of wind speed: instantaneous value and average value, and the average value is generally used. Wind is measured by electric anemometer, portable anemometer, Dyne anemometer and hot ball anemometer, which is used to measure the breeze in farmland. It can also be estimated according to the wind level and the signs of ground objects.