.

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 isdesigned to have widewindowcover
withglass materials, and carryout the monitoring survey through the shelter glass. This study examines
the likely effect of the shapesof 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 ontotal 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