Uncrewed aerial systems photogrammetry to spatially monitor slope deformations

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200209311

Keywords: slope deformation, rock slope failure, UAS, uncrewed aerial systems photogrammetry, displacement velocities
The displacement vectors between 2018 and 2019 indicate plausible surface displacements for the most active sub domain with velocities of 0.21-0.7 ±0.05 m/a-1and is in excellent agreement with TLS, GNSS and extensometer measurements indicating displacement rates of 0.2-0.3 m/a-1 over the period 2012 -2019 (Rechberger et al. 2018). UAS-P data indicate surface displacement rates of0.14-0.23 ±0.05 m/a-1for this sub domain. Here TLS measurements are also in agreement with in velocities of 0.05-0.25 m/a-1. Displacement vectors can also successfully be calculated indicating subdomain delineations, which fit with those derived from long-term observations and monitoring data. The innovative method of acquiring UAS images and successive 3D point cloud analysis allows for a new complimentary method to established in-situ methods to conduct extended spatial monitoring campaigns of slope deformations. The method shows a high level of accuracy validated against control data, with a lower detection limit of 0.05 m a-1. It is inexpensive in comparison to traditional monitoring techniques, and can be applied to slope deformations, which are not already equipped with permanent monitoring systems, which will be invaluable as the need for characterisation of recently inventoried slope deformations in Austria develops.