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Publié le 13 juin 2023 | Mis à jour le 21 juin 2023

Friday 30 June

Remote sensing to study river environments

The Ain River is a pilot site in the exploration of remote sensing techniques with more than 30 years of research projects and data acquired. The Remote Sensing Day will be an opportunity to present a range of techniques for the restitution of river facies on the scale of Ain and Rhône basin (bathymetry, sediment transfer, thermie, alluvial forest, restoration project...) by highlighting the variety of sensors and vectors used and the techniques that have emerged. This day will allow to discover different ranges of UAV and sensor equipment with exchanges on their advantages and disadvantages. A photogrammetry workshop by SFM is proposed to learn how to produce digital elevation models and estimate sediment volumes. A drone flight demonstration will be carried out over a restoration site.

Speakers:



09.00

Lower Ain river, a pilot site for the exploration of remote sensing techniques

Historical contextualisation of the databases acquired and used on the Ain valley base over the last 30 years (one of the richest "image/data corpus" in the field of river studies), highlighting the variety of sensors and vectors used and the techniques that have emerged in parallel.
Speaker: Jérôme Lejot

09.30

Feasibility of characterising water depths and the state of health of riparian forests: the case of lower Ain river

Speaker: Julien Godfroy

10.00

Thermal infrared mapping of river corridors: from geomorphological diagnostics to biological applications

Speaker: Baptiste Marteau

10.30

Remote sensing method to monitor aquatic vegetation

Speaker: Leo Rasse

11.45

Presentation of UAV platforms and sensors: interests, limits, operationality & legislative constraints

Presentation of a range of UAV equipment (Phantom4, Matrice 300, S900, etc.) and sensors (broadband, multispectral, LiDAR, thermal, near infrared, tag antenna). Discuss the advantages/disadvantages, recommendations, interest for practitioners/managers. What is already operational and what is being explored. Update on drone legislation and regulations.

12.00

Picnic


13.30

Drone flight (Phantom 4 RTK DJI) and image acquisition of a sedimentary reload (Terre soldat site)

Speakers: Franck Perret, Louis Rey

16.00

Photogrammetry workshop by SFM (Structure From Motion) to estimate sediment volumes

Handling data acquired in the field (or already prepared if flying is impossible): SFM approach + volumetric calculation + 3D representation.