Terrestrial Laser Scanning for the Visualization of a Complex Dome in an Extreme Alpine Cave System Terrestrisches Laserscanning zur Visualisierung eines komplexen Hohlraums in einem extremen alpinen Höhlensystem

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Abstract:

The 3D surveying of two big cavities with very complex shapes in the Dachstein Southface Cave, Styria, Austria, serves as an example to demonstrate the efficiency of exact coordinate registration in caves by means of laser scanning. The surveyed cave is not open to the public and classified as difficult. The complicacy of a suggestive visualisation of such complex cavities is shown using the so-called Ramsau Dome as an example. Digital animations are considered the only possibility to adequately visualise such cave systems. During a surveying campaign of several days the Riegl Z-420i laser scanner worked reliably as data acquisition instrument despite the extreme conditions regarding temperature, air humidity and dirt. The generated point cloud models represent the presently best data bases for application modelling like for well discharges in karst hydrology and photo-realistic visualisations.

German
Am Beispiel der Vermessung von zwei mächtigen und formmäßig komplexen Hohlräumen in der Dachsteinsüdwandhöhle, Steiermark, Österreich, wird das Potential für deren Formerfassung mittels Laser-Scanner erläutert. Die Höhle ist nicht für die Öffentlichkeit zugänglich und gilt als schwer begehbar. Anhand des so genannten Ramsauer Doms wird die sehr schwierige graphische Darstellung solch komplexer Hohlräume demonstriert und als einzige Möglichkeit für eine adäquate Visualisierung die digitale Animation erkannt. Der eingesetzte Laser-Scanner Riegl LMS Z420i hat sich unter extremen Bedingungen hinsichtlich Temperatur, Luftfeuchtigkeit und Schmutz während des mehrtägigen Einsatzes als Datenerfassungsinstrument bewährt. Die letztendlich entstandenen Punktwolkenmodelle stellen die bislang besten Datengrundlagen für verschiedene Applikationsmodellierungen, wie z. B. für Quellschüttungen in der Karsthydrologie und fotorealistische Visualisierungen, dar.

Keywords: 3D VISUALISATION; CAVE SURVEYING; DACHSTEIN; KARST HYDROLOGY; TERRESTRIAL LASER SCANNING

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/1432-8364/2009/0025

Publication date: October 1, 2009

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  • Photogrammetrie - Fernerkundung - Geoinformation (PFG) is an international scholarly journal covering the progress and application of photogrammetric methods, remote sensing technology and the intricately connected field of geoinformation processing.

    Papers published in PFG highlight new developments and applications of these technologies in practice. The journal hence addresses both researchers and student of these disciplines at academic institutions and universities and the downstream users in both the private sector and public administration.

    PFG places special editorial emphasis on the communication of new methodologies in data acquisition, new approaches to optimized processing and interpretation of all types of data which were acquired by photogrammetric methods, remote sensing, image processing and the computer-aided interpretation of such data in general.

    PFG is the official journal of the German Society of Photogrammetry and Remote Sensing.
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