Séminaire ISTerre

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Quantifying landscape dynamics with lidar data time series: opportunities, challenges and carbon footprint

jeudi 15 mai 2025 - 11h00

Dimitri Lague - Géosciences Rennes
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Airborne, drone and terrestrial LIDAR data are now part of the classic toolbox of earth and environmental scientists. The French national LIDARHD coverage provides unprecedented opportunities to study landscape organisation, green LIDAR can accurately measure the bathymetry of shallow rivers and coasts, while repeated LIDAR surveys allow the study of rates and patterns of topographic change at very high resolution and precision. Beyond the "wow" effect of having near-perfect digital twins of the natural landscape, including vegetation, lies the challenge of processing the raw 3D data, dealing with geometric uncertainties, and developing new tools to help scientists extract meaningful data from billions of 3D points. Here I'll present some examples of processing and application of repeated LIDAR to study geomorphological processes such as co-seismic landslides, vegetation-driven accretion in salt marshes, and rates of bedrock meandering from flood to decadal time scales. I will highlight some of the outstanding challenges in LIDAR processing and opportunities to reduce the carbon footprint of data acquisition and processing.

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Equipe organisatrice : Grands Séminaires ISTerre

Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères

Informations de visio :

https://univ-grenoble-alpes-fr.zoom.us/j/98816923614?pwd=doSrbkqUdbqY8KZoSZ1CWAATc2g7Wg.1