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