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Combined Use of Terrestrial Laser Scanning and UAV Photogrammetry in Mapping Alpine Terrain

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Institute of Geography, Faculty of Science, Pavol Jozef Šafárik University in Košice, 040 01 Košice, Slovakia
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Department of Physical Geography and Geoecology, Faculty of Natural Sciences, Comenius University in Bratislava, 842 15 Bratislava, Slovakia
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(18), 2154; https://doi.org/10.3390/rs11182154
Received: 2 August 2019 / Revised: 4 September 2019 / Accepted: 5 September 2019 / Published: 16 September 2019
(This article belongs to the Section Remote Sensing Image Processing)
Airborne and terrestrial laser scanning and close-range photogrammetry are frequently used for very high-resolution mapping of land surface. These techniques require a good strategy of mapping to provide full visibility of all areas otherwise the resulting data will contain areas with no data (data shadows). Especially, deglaciated rugged alpine terrain with abundant large boulders, vertical rock faces and polished roche-moutones surfaces complicated by poor accessibility for terrestrial mapping are still a challenge. In this paper, we present a novel methodological approach based on a combined use of terrestrial laser scanning (TLS) and close-range photogrammetry from an unmanned aerial vehicle (UAV) for generating a high-resolution point cloud and digital elevation model (DEM) of a complex alpine terrain. The approach is demonstrated using a small study area in the upper part of a deglaciated valley in the Tatry Mountains, Slovakia. The more accurate TLS point cloud was supplemented by the UAV point cloud in areas with insufficient TLS data coverage. The accuracy of the iterative closest point adjustment of the UAV and TLS point clouds was in the order of several centimeters but standard deviation of the mutual orientation of TLS scans was in the order of millimeters. The generated high-resolution DEM was compared to SRTM DEM, TanDEM-X and national DMR3 DEM products confirming an excellent applicability in a wide range of geomorphologic applications. View Full-Text
Keywords: terrestrial laser scanning; UAV photogrammetry; alpine terrain; digital modelling; point cloud terrestrial laser scanning; UAV photogrammetry; alpine terrain; digital modelling; point cloud
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MDPI and ACS Style

Šašak, J.; Gallay, M.; Kaňuk, J.; Hofierka, J.; Minár, J. Combined Use of Terrestrial Laser Scanning and UAV Photogrammetry in Mapping Alpine Terrain. Remote Sens. 2019, 11, 2154.

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