How do meteorologists know where to put "L" and "H" on the weather map?

Generally speaking, in domestic meteorology, weather maps are marked with "L" and "N" or "G" and "D", indicating cold and warm and high respectively. There is no H symbol in the domestic weather map. If there is, it may be' low' and' high', and there are also high and low points. Height refers to the high pressure center or low pressure center, which is generally calibrated according to the wind field, pressure field or height field observed on the ground or at high altitude. The low pressure in the northern hemisphere is generally at the center of the counterclockwise wind field, and the high pressure is at the center of the clockwise wind field.

If there is an observation station and the observation station has a wind direction, then the high and low pressure centers cannot be displayed on the observation station.