RT Journal Article
T1 Deformation measurement of twisted timber beam using UAV SfM photogrammetry and a new feature extraction algorithm
A1 Ortiz Sanz, Juan
A1 Bastos Costas, Guillermo
A1 Gil Docampo, María de la Luz
AB Drones facilitate the monitoring of large structures through feature extraction from point clouds generated through Structure-from-Motion photogrammetry. In the present study, we determined the deformation of a structural timber strip subjected to simultaneous bending and torsion. Three cameras were used. Two of them are pre-installed on the UAVs utilized, and the third is a consumer-grade Canon camera. All three were configured in flight mode. The geometry of the timber strip was generated through photogrammetry from the photos taken with each camera at a height of 1.5 m. The results were compared with the reference geometry, which was also created using the Canon camera on the ground at an average distance of 0.92 m. This reference geometry was previously validated in a preparatory project using extensometers with 1-µm precision. A Python-based algorithm was developed to automatically extract the position of the centroid and the rotation of each cross-sectional segment of the strip from UAV-based photogrammetric point clouds. Deformations measured by each of the three devices and the new algorithm are compared with actual deformation. The accuracy in measuring displacement and rotation of the centroid of strip cross-sections ranged between − 0.05 and 0.09 mm and between 0.00° and 0.24°, respectively.
PB Springer
YR 2025
FD 2025
LK https://hdl.handle.net/10347/42655
UL https://hdl.handle.net/10347/42655
LA eng
NO Ortiz-Sanz, J., Bastos, G. & Gil-Docampo, M. Deformation measurement of twisted timber beam using UAV SfM photogrammetry and a new feature extraction algorithm. Eur. J. Wood Prod. 83, 88 (2025). https://doi.org/10.1007/s00107-025-02245-9
NO Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. J.O.S. received research support in the frame of Grant PID2020-112954RA-I00 funded by MICIU/AEI/10.13039/501100011033, and M.G.D. from the aforementioned grant from the Xunta de Galicia (Ref. ED431B 2020/25).
DS Minerva
RD 23 abr 2026