The effect of materials and conditions on reflectorless electronic distance measurements from a Total station

James, Jeffrey (2016) The effect of materials and conditions on reflectorless electronic distance measurements from a Total station. [USQ Project]

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Abstract

Surveying has been a profession that has been around for many years now. Over the years with advancements in technology the equipment and techniques used to survey have changed. Currently there is a big use of reflectorless electromagnetic distance measurement (REDM) form a variety of platforms and in particular total stations. What is unknown is what effect that materials and conditions have on the REDM.

Twelve different materials were tested ranging from timber of varying types, concrete and metal of varying types. Six different conditions were tested including cold and wet targets. Ten different colours were also tested ranging from white to black in the colour spectrum. The incorporation of angles was also used as a factor of target influences. All the items tested changed the properties of the target in different ways.

Testing was carried out over a baseline under confined conditions to eliminated other sources of error associated with EDM and a procedure was developed to aid with the eliminated of other errors. As a result of the tight parameters set it allowed for any deviations in measurements to be associated with the target and interesting results were derived.

The results for the worst angle was 60⁰ and the worst colour was produced by black targets. The black targets had a mean of 3.7mm longer than the true distance and had a range of 15.16mm. The best performing condition was the targets influence by the cold and produced a range of 1.08mm and a mean of 0.0012mm less than the true distance. The
metal targets performed the worst in relation to the range and the besser block had a mean of 1.65mm longer than the true distance as the worst material.

More testing can be done to provide more knowledge on how targets interact under different scenarios such as baseline distances, different lasers, different conditions and different materials. The combinations are almost endless.

Conclusions can be made that materials and conditions do have an effect of REDM and knowledge should be obtained to determine the likelihood of potential errors associated with REDM under different scenarios in order for the surveyor to obtain correct data.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Spatial Science (Honours) Major Surveying project
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Gharineiat, Zahra
Date Deposited: 20 Jul 2017 04:44
Last Modified: 20 Jul 2017 04:44
Uncontrolled Keywords: reflectorless electromagnetic distance measurement; baseline distances; lasers
Fields of Research : 09 Engineering > 0909 Geomatic Engineering > 090906 Surveying (incl. Hydrographic Surveying)
URI: http://eprints.usq.edu.au/id/eprint/31425

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