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UAV survey of a coastal cliff face – Selection of the best imaging angle
- Source :
- Measurement-Journal of the International Measurement Confederation (IMEKO), Measurement-Journal of the International Measurement Confederation (IMEKO), Elsevier, 2019, 139, pp.10-20. ⟨10.1016/j.measurement.2019.02.024⟩, Measurement-Journal of the International Measurement Confederation (IMEKO), 2019, 139, pp.10-20. ⟨10.1016/j.measurement.2019.02.024⟩, Measurement (0263-2241) (Elsevier Sci Ltd), 2019-06, Vol. 139, P. 10-20
- Publication Year :
- 2019
- Publisher :
- HAL CCSD, 2019.
-
Abstract
- UAVs are relevant for monitoring cliff faces. In this study, several flights are performed with various imaging angles (nadir, 20 degrees, 30 degrees and 40 degrees 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 degrees, 30 degrees and 40 degrees 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.
- Subjects :
- Cliff face erosion
UAV
Coastal monitoring
02 engineering and technology
01 natural sciences
0202 electrical engineering, electronic engineering, information engineering
Nadir
Cliff
Electrical and Electronic Engineering
Instrumentation
Image resolution
Remote sensing
geography
geography.geographical_feature_category
coastal monitoring
[SDE.IE]Environmental Sciences/Environmental Engineering
Applied Mathematics
020208 electrical & electronic engineering
010401 analytical chemistry
cliff face erosion
Flight height
SfM photogrammetry
[SHS.GEO]Humanities and Social Sciences/Geography
Condensed Matter Physics
0104 chemical sciences
Normandy
Tilted camera
tilted camera
Face (geometry)
[SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Geology
Subjects
Details
- Language :
- English
- ISSN :
- 02632241 and 1873412X
- Database :
- OpenAIRE
- Journal :
- Measurement-Journal of the International Measurement Confederation (IMEKO), Measurement-Journal of the International Measurement Confederation (IMEKO), Elsevier, 2019, 139, pp.10-20. ⟨10.1016/j.measurement.2019.02.024⟩, Measurement-Journal of the International Measurement Confederation (IMEKO), 2019, 139, pp.10-20. ⟨10.1016/j.measurement.2019.02.024⟩, Measurement (0263-2241) (Elsevier Sci Ltd), 2019-06, Vol. 139, P. 10-20
- Accession number :
- edsair.doi.dedup.....312893eb3b500c578148065195051f94