Terrestrial laser scanning has led to a new era of surveying in many engineering fields in last two decades. The fast and reliable method of measurement fosters the fact that scanning takes precedence over classical terrestrial measurements in usage where scanning achieves the required accuracy, where conditions for measurement are more demanding, where objects are complex and where other methods would take much more time. One example with that kind of conditions is the measurement of geometry in tunnel, as contractors are interested in the quality of the work performed or compliance of the performed works with the project documentation. In our master's thesis, we were interested in the usability and quality of laser scanners in determining the geometry of the tunnel primary lining. We compared and evaluated the results obtained with the BLK360 and ZEB Go laser scanners in more detail. The results of tachymetric measurement and laser scanning with a Leica Nova MS50 were used as reference data. We provided the test data by measuring in the Pekel railway tunnel. After analyzing the obtained results, we determined the criteria for the usability of laser scanners and laser scanning technology for measurements in tunnels.
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