What is barometric leveling?

Barometric leveling is a method used to determine differences in elevation between points by measuring atmospheric pressure. It relies on the principle that air pressure decreases with altitude; thus, by using barometers at different locations, one can calculate the elevation differences based on the recorded pressure values. This technique is particularly useful in areas where traditional leveling methods are impractical. However, it can be affected by weather conditions and temperature variations, which must be accounted for to ensure accuracy.