What is levelling in surveying?

Levelling is a branch of surveying used to measure the height of specified points relative to a datum or to establish vertical positions. It is widely applied in geodesy, cartography, and construction to verify or find relative heights and ensure surfaces are level. Practitioners often use optical instruments like levels alongside levelling staffs to accomplish these vertical measurements.

What we know

• Levelling is a branch of surveying that establishes, verifies, or measures the height of specified points relative to a datum. [2]
• An optical level and a levelling staff are used together to establish the relative height or vertical separation of objects or marks. [3]
• Levelling is utilized in geodesy and cartography for measuring vertical position, and in construction for measuring height differences of artifacts. [2]
• One practical application of levelling is to ensure ground is level during construction, such as when preparing foundations for houses. [5]

Where to go next

• how it workedHow does an optical level work?
• the bigger pictureWhat is land surveying?
• a case in pointHow are glossaries of surveying terms defined?
• compared withWhat is the difference between a level and a theodolite?
• what followedHow is vertical position measured in geodesy?
• an unexpected connectionHow do programming languages relate to surveying?Modern land surveyors utilize advanced equipment and software that incorporate programming languages alongside classical geometry and physics.

Sources

• [1]levelling (Wikidata Q961466) · CC0 1.0
• [2]Levelling · CC BY-SA 4.0
• [3]Level (optical instrument) · CC BY-SA 4.0
• [4]Surveying · CC BY-SA 4.0
• [5]Glossary of levelling terms · CC BY-SA 4.0