Levelling
Surveying technique / From Wikipedia, the free encyclopedia
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This article is about the surveying technique. For other uses, see Levelling (disambiguation).
"Spirit levelling" redirects here. For the bubble level, see Spirit level.
"Single-levelling" redirects here. For other uses, see Single-level (disambiguation).
Levelling or leveling (American English; see spelling differences) is a branch of surveying, the object of which is to establish or verify or measure the height of specified points relative to a datum. It is widely used in geodesy and cartography to measure vertical position with respect to a vertical datum, and in construction to measure height differences of construction artifacts.