first-order leveling

first-order leveling

[¦fərst ‚ȯrd·ər ′lev·ə·liŋ]
(engineering)
Spirit leveling of high precision and accuracy in which lines are run first forward to the objective point and then backward to the starting point.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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