How do snipers judge how many meters the wind speed advances per second?

The observer will tell the sniper these specific data, and then the sniper will adjust the adjusting device on the sight of the sniper rifle according to these data, that is, two buttons are enough. ~ ~ ~ ~ ~ ~ ~ There is also a visual method, which can also roughly estimate the distance, that is, judge the distance according to vision, target clarity and practical experience. The commonly used methods are comparison method and judgment method. (1), the comparison method is to compare the distance to be measured with the known distance. You can also divide the distance to be measured into several sections and compare them to calculate the total length. (2) The judgment method is to judge the distance according to the clarity of the target, as shown in the following table. However, because everyone's eyesight is different and influenced by the size, color, weather, light and angle of the target, they can use it flexibly according to their own experience. Distance (m) Target clarity 100 Facial features, hand joints and external parts of infantry firearms can be seen 150- 170 buttons for clothes, 200 tiles for kettles and equipment, barbed wire for leaves and roofs, cracks and tiles for 250-300 walls. The facial features are unclear, the color of clothes can be divided into 400 faces, the head and shoulders can be divided into 500 doors to see the switch, the windows can see the grid, and the tiles are unclear; Head and shoulders can't be distinguished, men and women can be divided into 700 watts, windows are lined up, pedestrians are divided, and elbows can't be distinguished. 1000 The outline of the house is clear, the tiles are messy, and the doors are lined with windows. The human body is generally 1500 watts thick, with a flat surface and holes in the windows; People become small black spots, and their actions are unclear. 2000 windows are shadows and doors are holes; People become small black spots, and their actions are unclear. 3000 houses are blurred, the doors are difficult to separate, and chimneys can still be seen on them.