Inspection of the Jonction viaduct in Geneva
Viaduct inspection: photogrammetric restitution of the downstream and upstream facings of the Jonction viaduct (220m), June 2015. Work carried out from 1350 aerial shots taken by AirX3, the leading company in engineering structure inspections in Switzerland.
Extracts
The Jonction viaduct is the eighth most upstream bridge on the Rhône after it leaves Lake Geneva. It is located directly after the meeting of the Rhône and the Arve and connects the district of Saint-Jean on the right bank and the Bois de la Bâtie on the left bank. With this viaduct, automatic flights with the Falcon 8 drone enabled captation of successive images in very high definition (3mm) making it possible to ultimately 3d model the entire viaduct. Thus, the downstream & upstream faces could be analyzed directly from the orthomosaics on which we located all of the following defects:
- Cracks.
- Visible reinforcements.
- Vegetation.
- Water infiltration.
- Masonry joints.
- Calcite.
TECHNICAL INFORMATIONS
- Aerial imagery post-processing service : Drones Imaging. company.
- Flights and aerial imagery : AirX3 company.
- Spatial accuracy : centimeter.
- Orthophoto RVB : GSD 3mm.
- Total length inspected : 220m.
- Drone : Falcon 8.
- Photogrammetry software : Agisoft Metashape.
- Export formats : GeoTiff, Shp and Pdf.
- Delivery delays : 8 days.
- Use case taught during our photogrammetry training : see more.