A comparison of the limitations and accuracy of both obstructed prism and obstructed non-prism measurements

Hooson, Mitchell D (2015) A comparison of the limitations and accuracy of both obstructed prism and obstructed non-prism measurements. [USQ Project]

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Abstract

Whether it be through the implementation of either prism based measurements, or non-prism based measurements, when an obstruction is introduced into the equation, and a clear unobstructed view between the instrument and target no longer exists, there is a strong possibility of a distortion of some magnitude being introduced into any recorded data.

The aim of this report is to compare and contrast both the limitations and accuracies of obstructed prism based (both ATR and manual pointing) and obstructed non-prism based field measurements and to derive the reliability as well as the repeatability of such measurements.

The instruments being tested in this project include the Topcon DS-203AC Total Station, the Leica TPS1103 Total Station and the Trimble SPS930 DR+ Total Station. A series of physical obstructions were placed at different distance intervals between these instruments and targets so that the view to the target from the instrument was obstructed. These distance intervals between the instrument/ target and the obstruction were altered in proximity to both the instrument and target in order to best simulate a variety of field conditions. The overall distance between the instrument and the target were also varied to simulate different situations.

Results obtained from this investigation indicated clear trends amongst the instruments through all of the obstructions. Whilst some obstructions had little impact on the accuracy of the instrument readings, other obstructions introduced some significant and intolerable errors. After all of the results had been analysed, a set of recommendations was compiled from the analysed data that indicate the accuracy and repeatability of each of the different methods of measurement through different obstructions and how the resulting errors can best be mitigated and minimised.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Spatial Science project
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Paudyal, Dev Raj
Date Deposited: 06 Jun 2016 06:24
Last Modified: 06 Jun 2016 06:24
Uncontrolled Keywords: Reflectorless, Obstructed Prism, Obstructed Non-Prism, Measurements
Fields of Research : 09 Engineering > 0909 Geomatic Engineering > 090999 Geomatic Engineering not elsewhere classified
URI: http://eprints.usq.edu.au/id/eprint/29253

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