Fiche du document
2019
- handle: 10670/1.4f7mti
- hal: hal-02067558
- doi: 10.1016/j.measurement.2019.02.024
Ce document est lié à :
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.measurement.2019.02.024
info:eu-repo/semantics/OpenAccess
Sujets proches
Human faceCiter ce document
Marion Jaud et al., « UAV survey of a coastal cliff face – Selection of the best imaging angle », HAL-SHS : géographie, ID : 10.1016/j.measurement.2019.02.024
Métriques
Partage / Export
Résumé
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.