Cliff inspection by drone and photogrammetry in Bonifacio – Corsica

Cliff inspection and 3D modeling as part of the redevelopment of the Bonifacio port infrastructure.

Corsica, September 2018. Results obtained from 370 aerial images collected in collaboration by the companies Aérodronescorse and I-techdrone.

Inspection_falaise_par_Photogrammétrie_Drones-Imaging©

As part of the redevelopment of its port infrastructure, the Territorial Collective of Corsica (CTC) engaged the services of the companies Aérodronescorse, I-techdrone and Drones Imaging for the topographic survey of a cliff measuring 400m length and 50m height in Bonifacio.

Using Photoscan and 3DReshaper softwares, the 370 aerial shots taken by drone allowed to model the cliff in the form of a dense cloud (1pt every 5cm for a high accuracy and restitution of the site’s topography). The 3D model thus generated, whose spatial accuracy is a few centimeters (accuracy obtained thanks to targets previously arranged and measured with a GNSS RTK receiver) allowed the automated export of a hundred topographic sections (cross profiles over the entire length of the cliff) for the detection and location of overhanging areas (immediately identified as risk areas).

Subsequently, this 3D modeling will also serve as initial support to study the morphology of the rock walls and their evolution over time. Indeed, thanks to future aerial surveys and by temporal comparison, it will be possible to locate and quantify automatically the rock walls weakened by erosion and therefore potentially dangerous during the development work of the port.

3D Visualization

  • Images capture : sociétés Aérodronescorse et I-techdrone.
  • Post processing : Drones Imaging.
  • Softwares used : Photoscan & 3DReshaper.
  • Airborne platform: Drone MK.
  • Sensor: SONY A7R.
  • Area : 2ha

 

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