The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XLIII-B1-2020
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B1-2020, 457–463, 2020
https://doi.org/10.5194/isprs-archives-XLIII-B1-2020-457-2020
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B1-2020, 457–463, 2020
https://doi.org/10.5194/isprs-archives-XLIII-B1-2020-457-2020

  06 Aug 2020

06 Aug 2020

IMPROVING VERTICAL ACCURACY OF UAV DIGITAL SURFACE MODELS BY INTRODUCING TERRESTRIAL LASER SCANS ON A POINT-CLOUD LEVEL

T. Ivelja1, B. Bechor2, O. Hasan3, S. Miko3, D. Sivan2, and A. Brook4 T. Ivelja et al.
  • 1Zagreb University of Applied Sciences, Zagreb, Croatia
  • 2Department of Maritime Civilizations, L. Charney School of Marine Sciences, University of Haifa, Israel
  • 3Croatian Geological Survey, Zagreb, Croatia
  • 4Department of Geography and Environmental Studies, University of Haifa, Haifa, Israel

Keywords: Vertical accuracy, DSM, UAV, TLS, point cloud, SfM workflow

Abstract. Digital Surface Models (DSM) generated by image-based scene reconstruction from Unmanned Aerial Vehicle (UAV) and Terrestrial Laser Scanning (TLS)point clouds are highly distinguished in terms of resolution and accuracy. This leads to a situation where users have to choose the most beneficial product to fulfill their needs. In the current study, these techniques no longer compete but complement each other. Experiments were implemented to verify the improvement of vertical accuracy by introducing different amounts and configurations of Terrestrial Laser scans in the photogrammetric Structure from Motion (SfM) workflow for high-resolution 3D-scene reconstruction. Results show that it is possible to significantly improve (∼ 49% ) the vertical accuracy of DSMs by introducing a TLS point clouds. However, accuracy improvement is highly associated with the number of introduced Ground Control Points (GCP) in the SfM workflow procedure.