Effect of environmental surroundings on accuracy and precision of total station measurements

Ford, Joseph (2015) Effect of environmental surroundings on accuracy and precision of total station measurements. [USQ Project]

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Abstract

This thesis investigates the accuracy and precision of total station measurements with the interference of commonly found objects in areas surveys are performed. The objects chosen were that of
- Retro-reflective,
o Sign
o Tail light assembly
- Background
o Water
- Obstructions
o Glass
o Expanded mesh
o Vegetation

Field experiments were designed to test how the accuracy and precision of EDM measurements fared when these objects were in line of sight of reflector. Two total stations were chosen for the testing, these were the
- Trimble 5600
- Trimble S6

The reflectors chosen were the
- TRIMBLE SUPER Prism
- TRIMBLE MT1000 Multitrack 360 Degree Target
- Direct Reflex

The field experiments took place over a range of 6 different stations for retro reflective and obstruction testing. The background interference was tested at only 3 due to geographical limitations.

The findings of field testing were
- When measuring with retroreflective objects near or on line of sight, the Super prism should be measured to, which produced a higher accuracy over the 360 prism.
- A problematic distance of 100-200m when measuring to the 360 prism was found to yield particularly erroneous results with the retroreflective sign providing interference.
- Measurements for water in the background showed conflicting trends between the two instruments but both instruments recorded more accurate results using the super prism over the 360 prism.
- All results with the obstruction test recorded a decrease in accuracy with an increase of distance, - excluding the case of vegetation with the 5600 instrument.
- Glass resulted with the least accurate measurements of the obstruction, with a clear trend showing the closer, the obstruction to the instrument the more error reflected into the measurement.
- The super prism recorded much better results than the 360 prism over the shorter distances (25-200m) and minimal differences between the two stations at 400m and 750m stations.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Spatial Science (Surveying) project
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Gharineiat, Zahra
Date Deposited: 06 Jun 2016 01:41
Last Modified: 06 Jun 2016 01:41
Uncontrolled Keywords: EDM Measurement, Reflection, Surveying, Interference
Fields of Research : 09 Engineering > 0909 Geomatic Engineering > 090999 Geomatic Engineering not elsewhere classified
URI: http://eprints.usq.edu.au/id/eprint/29228

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