error of closure

noun Surveying.
the amount by which a closed traverse fails to satisfy the requirements of a true mathematical figure, as the length of line joining the true and computed position of the same point.
the ratio of this linear error to the perimeter of the traverse.
(for angles) the amount by which the sum of the observed angles fails to equal the true sum.
(in leveling) the amount by which an elevation determined by a series of levels fails to agree with an established elevation.
Also called closing error. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
error of closure
surveying Also called: closing error the amount by which a computed, plotted, or observed quantity or position differs from the true or established one, esp when plotting a closed traverse

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The same provision also specifies an allowable error of closure of survey.
Individual traverse calculations, including error of closure, for each lot
  affected by the adjustment plat.
The error of closure for a traverse of the boundaries of the tract blocks or
  lots shall be one in five thousand or less.
Provide print-out of the mathematical closure of the exterior boundary of the
  subdivision indicating the error of closure.
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