Journal
GEOMORPHOLOGY
Volume 260, Issue -, Pages 4-15Publisher
ELSEVIER
DOI: 10.1016/j.geomorph.2015.05.011
Keywords
Structure-from-Motion; 3D point cloud; Unmanned aerial vehicle; Topography; Precision; Digital surface model
Funding
- Belgian Science Policy
- Research Program for Earth Observation Stereo II as part of the FOMO project [SR/00/133]
- Inter University Attraction Pole project: SOGLO - the Soil System under Global Change [P7/24]
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Combination of UAV-based aerial pictures and Structure-from-Motion (SfM) algorithm provides an efficient, low-cost and rapid framework for remote sensing and monitoring of dynamic natural environments. This methodology is particularly suitable for repeated topographic surveys in remote or poorly accessible areas. However, temporal analysis of landform topography requires high accuracy of measurements and reproducibility of the methodology as differencing of digital surface models leads to error propagation. In order to assess the repeatability of the SfM technique, we surveyed a study area characterized by gentle topography with an UAV platform equipped with a standard reflex camera, and varied the focal length of the camera and location of georeferencing targets between flights. Comparison of different SfM-derived topography datasets shows that precision of measurements is in the order of centimetres for identical replications which highlights the excellent performance of the SfM workflow, all parameters being equal. The precision is one order of magnitude higher for 3D topographic reconstructions involving independent sets of ground control points, which results from the fact that the accuracy of the localisation of ground control points strongly propagates into final results. (C) 2015 Elsevier B.V. All rights reserved.
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