University of Khartoum

Optical, Laser and Digital Levelling: A Comparison of Accuracy in Height Measurement

Optical, Laser and Digital Levelling: A Comparison of Accuracy in Height Measurement

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Title: Optical, Laser and Digital Levelling: A Comparison of Accuracy in Height Measurement
Author: Abanmy,Fahd A.; Ali, Abdullah E.; Alsalman, Abdullah S.
Abstract: Three levelling instruments of different designs, an NA2 optical level from Leica, an LP3A laser level from Sokkia and an SDL30 digital level, also from Sokkia, were compared for accuracy of height measurements. A base line was first established using geodetic means. This was then remeasured with the three test levels using two distinct approaches. In the first, several loops were run from a starting point, and back to it and misclosur es were computed and converted into accuracy values. In the second, el evations of all steel hub pegs were established several times from one end of the line and root-mean-square errors were computed and converted to pooled va lues. In both cases, the results showed that while the NA 2 generally satisfied second order class I standards, and the LP3A third order standards comm ensurate with most civil engineering surveys, the SDL30 achieved accuracy fa r better than those normally required for first order class I surv eys while saving time and effort. Taking into account its many other features, the authors suggest surveyors consider digital levels for their levelling work
URI: http://hdl.handle.net/123456789/6597
Date: 2007-01


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