Levelling

Center for Operational Oceanographic Products and Services staff member conducts tide station leveling in support of the US Army Corp of Engineers in Richmond, Maine.

Levelling (or leveling in US English) is a branch of surveying, the object of which is to

Levelling is the measurement of geodetic height using an optical levelling instrument and a level staff or rod having a numbered scale. Common levelling instruments include the spirit level, the dumpy level, the digital level, and the laser level.

单词	Double leveling
释义	Double leveling 英语百科 Levelling Levelling (or leveling in US English) is a branch of surveying, the object of which is to Levelling is the measurement of geodetic height using an optical levelling instrument and a level staff or rod having a numbered scale. Common levelling instruments include the spirit level, the dumpy level, the digital level, and the laser level.
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Double leveling

Levelling