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UAV survey of a coastal cliff face – Selection of the best imaging angle

Abstract : UAVs are relevant for monitoring cliff faces. In this study, several flights are performed with various imaging angles (nadir, 20°, 30° and 40° off-nadir) to assess the impact of the imaging angle on the 3D cliff face reconstruction. Occlusions issues arising with sub-vertical cliffs make nadir surveys nearly irrelevant. The results obtained with 20°, 30° and 40° off-nadir imaging angles are satisfactory regarding texture restitution and accuracy with respectively 5.5 cm, 5.9 cm and 4.9 cm of error, higher tilting angles yielding better reconstructions on sub-vertical or overhanging parts of the cliff. This article also investigates other parameters affecting tiepoint detection on the cliff face, as the effective overlap, the UAV-cliff face distance and the cliff face illumination. Guidelines are provided for UAV survey parameterization, aiming at capturing the whole cliff face with a good trade-off between distance to the cliff, flight height and spatial resolution of the photographs.
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Submitted on : Thursday, March 14, 2019 - 5:34:12 PM
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Marion Jaud, Pauline Letortu, Claire Théry, Philippe Grandjean, Stéphane Costa, et al.. UAV survey of a coastal cliff face – Selection of the best imaging angle. Measurement - Journal of the International Measurement Confederation (IMEKO), Elsevier, 2019, 139, pp.10-20. ⟨10.1016/j.measurement.2019.02.024⟩. ⟨hal-02067558⟩



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