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Author(s):	Dorninger, Peter; Studnicka, Nikolaus
Title:	Efficient digitization of the Zentrum am Berg research tunnel - From laser scan to triangulated surface model within one day
Abstract:	Unthinkable just a few years ago, the precise laser-scanning survey of a kilometer-long tunnel in one day by one operator has become possible. This article describes how 261 scans were taken with a RIEGL VZ-400i laser scanner to digitize the Zentrum am Berg (ZaB) research tunnel with millimeter resolution. The data has been automatically registered during the acquisition process within the instrument. After applying multistation adjustment, a block adjustment postprocess step, the high accuracy of the point cloud with respect to a network of 35 retroreflective bireflex targets has been approved. For further applications such as analysis, simulation, or visualization, a homogeneous 3D-meshed surface model has been created automatically from the point cloud representing an as-built 3D documentation of the tunnel. Digitalisierung des “Zentrum am Berg” Forschungstunnels - Vom Laserscan zum Triangulations-Modell in einem Tag Vor wenigen Jahren noch undenkbar, ist die präzise Laserscanning-Vermessung eines kilometerlangen Tunnels an einem Tag durch einen Operator möglich geworden. In diesem Beitrag wird beschrieben, wie 261 Scans mit einem RIEGL VZ-400i Laserscanner gemacht wurden, um den “Zentrum am Berg” (ZaB) Forschungstunnel mit Millimeterauflösung zu digitalisieren. Die Daten wurden während des Erfassungsprozesses automatisch im Gerät registriert. Nach Anwendung des Multi Station Adjustment, einem Postprozessschritt zur Blockausgleichung aller Scanpositionen, wurde die hohe Genauigkeit der Punktwolke in Bezug auf ein Netz von 35 retroreflektierenden “Bi-Reflex-Zielen” bestätigt. Für weitere Anwendungen wie Analyse, Simulation oder Visualisierung wurde aus der Punktwolke automatisch ein homogenes 3D-Netz-Oberflächenmodell erstellt, welches einen 3D-Bestandsplan des Tunnels darstellt.
Source:	Geomechanics and Tunnelling 15 (2022), No. 3
Page/s:	311-316
Language of Publication:	English/German

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