EDM Calibration and Finding Errors in the Baseline
This paper describes the methodology used to calibrate a set of six total stations over a typical NGS Calibrated Baseline (CBL), together with the results obtained. The methodology was extended to allow for the correction of some additional systematic errors in the EDM. It is presented to allow others to examine the processes used, and possibly adopt them for their own use when calibrating EDM over an NGS CBL. The measurements indicated that the 0 m point on the CBL had moved from its calibrated location by approximately 0.007 m (7 mm). Examination of the ground mark indicated a significant gouge on the brass plaque, consistent with an impact from a snow-clearing blade. This suggests that while the concrete remained intact, the brass plaque was deformed by the impact, and the zero point moved 0.007 m, lengthening lines connecting to the 0 m mark.
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