differential leveling

differential leveling

[‚dif·ə′ren·chəl ′lev·əl·iŋ]
(engineering)
A surveying process in which a horizontal line of sight of known elevation is intercepted by a graduated standard, or rod, held vertically on the point being checked.

differential leveling

The process of establishing the difference in elevation between any two points by using a level, 1 and a leveling rod.
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