Automatic filtering of terrestrial laser scanner data from cylindrical tunnels

In 2010, the construction of a double tube railway tunnel started under the Scheldt River in the port of Antwerp, Belgium. During the construction process, which will end in 2013, a systematic survey campaign is organized to perform an ovalization monitoring of selected concrete sections in both tunnels. A phase-based terrestrial laser scanner Leica HDS6100 is used to generate dense point sets of each selected section, with a spatial resolution of 4 mm or higher on specific moments in time. Based on every point set, a cross-section is calculated, which is compared with previously calculated cross-sections, to determine the deformation of the tunnel section. The location of the cross-section is defined by a materialized reference target and this cross-section is perpendicular to the axis of a best fit cylinder. This best fit cylinder is defined by a point set of of 7 concrete circular curved elements. After a point filtering has been performed, the cylinder is calculated by a least square fitting algorithm on the point set of each tunnel section.

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