An Analysis on the Effect of Free Station Traversing on the Uncertainties Associated with Control Points, in both an Open and a Closed Traverse

Cook, Alex (2018) An Analysis on the Effect of Free Station Traversing on the Uncertainties Associated with Control Points, in both an Open and a Closed Traverse. [USQ Project]


The use of resections in surveying is something that has started to become more commonplace with the increased on-board computing power of modern day total stations. It is more widely accepted now as a method of establishing a position, although there are still surveyors who don’t see it as a viable method. Using resections as a method of traversing, is disregarded even more so.

The purpose of the project is to compare whether or not these resection traverse are a viable method of promoting survey control.

Surveying works in Queensland, whether it be engineering works for Main Roads, Cadastral or Mining works for the Department of Natural Resources, Mines and Energies, or just everyday construction activities, professional surveyors are bound by specifications. The majority of these are the ICSMs SP 1 documents on control survey methods.

This paper will compare the accuracy of control points measured by a resection traverse to those established using an integrated control network by the guidelines set out by the various specifications.

For the practical side of the research project, the field work will be separated into two components, the Control Network, and the Resection Traverse. The control network will utilise GNSS field measurements, conventional field measurements, and differential levelling measurements. Since the purpose of the Control Survey is to create an accurate baseline for comparison, all components will be carried out to the various specifications.

Using previous research (Marshall 2007; Horemuz & Jansson 2016; Song et al. 2016), a set of parameters for the resection set ups was determined, the number of Targets will be 4, the optimal distance from Total Station to Target will be between 100 and 150m, and the minimum angular range must be less than 180° between adjacent Targets.

The results show that for this configuration and environment, that resection traverse did not meet the requirements for the middle class of conventional survey by SP1. They did, however meet the minimum requirements for the lowest class of control survey, indicating that the use of resections as a method of traversing is something that can be done in normal field work, and still adhere to the standard.

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Item Type: USQ Project
Item Status: Live Archive
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Gibbings; Peter
Qualification: Bachelor of Spatial Science (Honours) (Surveying)
Date Deposited: 25 Aug 2022 03:53
Last Modified: 27 Jun 2023 04:55
Uncontrolled Keywords: resections; surveying; computing power

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