Levelling

Levelling is a surveying process used to determine the height or elevation of points on the Earth's surface relative to a fixed reference, typically sea level. It involves using specialized instruments like a leveling instrument and a level staff to measure the vertical distances between points accurately. This process helps in construction, mapping, and engineering projects to ensure structures are built at correct heights and levels. Essentially, levelling ensures consistency and precision in understanding the terrain's elevation, which is crucial for designing roads, buildings, and other infrastructure.