Slope Monitoring using Total Station – a look at the effect of glass shapes on distance measurements with total station

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T. B. Afeni

Abstract

Continuous monitoring (be it slope or structural monitoring) with total station required the instrument to be stationed in the field, both day and night. This necessitates housing the total station in a shelter, which is designed to have wide window cover with glass materials, and carryout the monitoring survey through the shelter glass. This study examines the likely effect of the shapes of the glass medium on distance measures with total station during slope or structural monitoring through such shelter glass. In this study, three glass shapes were examined, namely; 2.0mm clear float plane, concave and convex glass panes. The result revealed that the shape of the glass matters when using total station to measure distances through a glass medium. However, the effect of the 2.0mm plane glass was within the accuracy specification limit, which is 1mm + 1.5 ppm, when using Infrared mode (IR mode) of the total station – Leica

TCR + 1201, used for this research, while the concave and convex glass pane impact exceeded the accuracy limit. However, it is recommended that further detail work should be carried out to quantify the impact of shelter glass shape on total station observations (taking through convex glass or concave glass) and develop a systematic error correction formula(e)/nomogram or model to cater for the impact.

Keywords: Total station, shelter, glass shapes, distance, measurements and impact.

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References

Afeni T.B. (2011). “An approach to eradicate the effects of atmospheric variations on total station distance measurement in a surface

mine environment. The impact of taking measurement through a glass mediumâ€.Unpublished PhD thesis, University of the

Witwatersrand, Johannesburg, South Africa. 525 pp

Afeni, T.B. and Cawood, F.T., (2010). “Do the properties of glass matter when taking total station distance measurements

through an observation window? Proceedings of ISM (International Society for Mine Surveying) XIV International

Congress held in Sun City, South Africa, pp. 109 – 120.

Hill, C.D. and Sippel, K.D. (2002). “Modern, Deformation Monitoring: A Multi Sensor Approachâ€. FIG (Federation

Internationale Des Geometres – International Federation of Surveyors) XXII International Congress, Washington GC,

USA; 12 pp.

Jooste, M.A. and Cawood, F.T. (2006).“Survey slope stability monitoring: Lessons from Venetia Diamond Mineâ€.

Proceedings of the International Symposium on Stability of Rock Slopes in Open Pit Mining and Civil Engineering, The

South African Institute of Mining and Metallurgy, Symposium Series 44, 2006. pp 361 – 374.

Kuhlmann, H. and Glaser, A. (2002).“Investigation of New Measurement Techniques for Bridge Monitoringâ€.2nd

Symposium on Geodesy for Geotechnical and Structural Engineering, Berlin, Germany.9 pp.

Lange, C and Kippelen, D. (2008).“Real-Time Monitoring for Support of Excavationâ€.Goe-Strata, Geo-institute of ASCE

(American Society of Civil Engineers), vol. 9, no. 1, pp. 16 – 18.

Leica Geosystems (2008), Leica TPS 1200 User Manual, version 3.0; 218 pp.

Lutes, J.A. (2002). “Automated dam displacement monitoring using a robotic total stationâ€. Master of Science dissertation,

University of New Brunswick, Fredericton, Canada.

Ostdiek, V.J. and Bord, D.J. (2008).Inquiry into Physics.6th edition, Thomson Learning Academic Resources Center, 10, Drive,

Belmont, CA, USA.

Palazzo, D., Friedmann, R., Nadal, C., Santos-Filho, M., Veiga, L., and Faggion, P. (2006). “Dynamic Monitoring of Structures

using a Robotic Total Stationâ€. XXIII FIG Congress, Munich, Germany, Oct. 8-13, 2006; 10 pp.

Radovanovic, R. S. and Teskey, W. F. (2001). “Dynamic Monitoring of Deforming Structures: GPS verses Robotic Tacheometry

Systemsâ€. The 10th FIG International Symposium onDeformation Measurements, Orange, California, USA, pp.

Rueger, J.M., Alanko, G and Snow, T.J.(1994). “Monitoring of an Open Cut Mine with a Surveying Robot. The Australian

Surveyor, vol.39, no.4, pp 252 – 266.

Zahariadis, H. and Tsakiri, M. (2006).“Low Cost Monitoring System in the Open Pit Lignite Mines of Megalopoli, Greeceâ€.3rd

IAG/12th FIG Symposium, Baden; 10pp.