levelling
Sign in to saveAlso known as leveling
thumbnail|A wooden tripod holding an optical level is set up firmly on the ground.
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- measurement
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- Levelling
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Encyclopedic overview
13 sectionsContents
- Optical levelling
- Procedure
- Turning a level
- Trigonometric levelling
- Refraction and curvature
- Levelling loops and gravity variations
- Instruments
- Classical instruments
- Automatic level
- Laser level
- See also
- References
- External links
thumbnail|A wooden tripod holding an optical level is set up firmly on the ground.
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. In photolithography, the same term is used in a lithography machine calibration step measuring or calibrating wafer surface height with respect to a reference.
Excerpted from Wikipedia’s “levelling” article, available under the CC BY-SA 4.0 licence.