The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XLIII-B2-2020
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B2-2020, 1099–1105, 2020
https://doi.org/10.5194/isprs-archives-XLIII-B2-2020-1099-2020
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B2-2020, 1099–1105, 2020
https://doi.org/10.5194/isprs-archives-XLIII-B2-2020-1099-2020

  14 Aug 2020

14 Aug 2020

EVALUATING THE QUALITY OF PHOTOGRAMMETRIC POINT-CLOUDS IN CHALLENGING GEO-ENVIRONMENTS – A CASE STUDY IN AN ALPINE VALLEY

E. Karantanellis1, R. Arav2, A. Dille3,4, S. Lippl5, G. Marsy6, L. Torresani7, and S. Oude Elberink8 E. Karantanellis et al.
  • 1Laboratory of Engineering Geology & Hydrogeology, Department of Geology, Aristotle University of Thessaloniki, Greece
  • 2Department of Geo-Information Engineering, Technion - Israel Institute of Technology, Haifa, Israel
  • 3Department of Earth Sciences, Royal Museum for Central Africa, Tervuren, Belgium
  • 4Department of Geography, Earth System Science, Vrije Universiteit Brussel, Brussels, Belgium
  • 5Institut für Geographie, Friedrich-Alexander-Universität, Erlangen-Nürnberg, Erlangen, Germany
  • 6Univ. Savoie Mont Blanc, LISTIC, 74000 Annecy, France
  • 7Department of Land, Environment, Agriculture and Forestry, University of Padova, Agripolis, Italy
  • 8Faculty of Geo-Information Science and Earth Observation, University of Twente, the Netherlands

Keywords: Structure-from-Motion Photogrammetry, Terrestrial Laser Scanning, Ground-based Photogrammetry, Rockfall characterisation, Mass Movement

Abstract. Precise and accurate three-dimensional geospatial data has become increasingly available thanks to advances in both Terrestrial Laser Scanning (TLS) and Structure-from-Motion Photogrammetry (SfM). These tools provide valuable information for mapping geomorphological features and detect surface changes in mountainous environments. The exploitation of 3D point-clouds has been proven tremendously useful in the field of geosciences. It remains, however, controversial whether cost efficient photogrammetry can provide as accurate and reliable geospatial information as the significantly more expensive laser scanning or not. In this study, a rockfall case site in the territory of Obergurgl, Austria, is investigated in order to provide answers to the above question in a complex environment. The analysis includes different terrestrial photogrammetry configurations aiming to comprehensively define the strengths and limitations of terrestrial photogrammetry over TLS. The latter constitutes an optimized methodology that provides guidelines for costly future assessments as part of the site investigation phase in geohazard management. There are no doubts that compared to traditional and conventional surveying methods TLS and Photogrammetry both offer products much faster and with a much higher data density. In the current study, we show that when photogrammetry is applied following a well-defined optimized strategy, it can be potentially an adequate alternative to more costly TLS datasets for mass movement assessment and monitoring purposes.