What elevation is measured by leveling?

The leveling surface measures the elevation of ground points.

The crosshair in the eyepiece of the level matches the reading of the leveling rod, measures the height difference between two points, and then calculates the elevation. The level can also measure the horizontal distance between the level and the leveling staff. The principle is simple. Leveling is the most traditional high-precision elevation measurement method. The distance accuracy of level measurement is low, so it can only be used as an auxiliary measurement with low requirements for distance accuracy.

Level is an instrument to establish a horizontal line of sight and measure the height difference between two points on the ground. The principle is to measure the height difference between ground points according to the leveling principle. The main components are telescope, pipe level (or compensator), vertical shaft, base and anchor screw. According to the structure, it is divided into micro-tilt level, automatic level, laser level and digital level (also known as electronic level). According to the accuracy, it is divided into precision level and ordinary level.