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Diachronic UAV Photogrammetry of a Sandy Beach in Brittany (France) for a Long-Term Coastal Observatory

1
IUEM—UMS 3113, Université de Bretagne Occidentale, IUEM, CNRS, Technopôle Brest-Iroise, Rue Dumont d’Urville, F-29280 Plouzané, France
2
Laboratoire Géosciences Océans-UMR 6538, Université de Bretagne Occidentale, IUEM, CNRS, Technopôle Brest-Iroise, Rue Dumont d’Urville, F-29280 Plouzané, France
3
Cerema, Direction Eau Mer et Fleuves, F-60280 Margny-lès-Compiègne, France
4
Laboratoire de Géologie de Lyon: Terre, Planètes, Environnement—UMR 5276, Université de Lyon, Université Claude Bernard Lyon 1, ENS Lyon, CNRS, F-69622 Villeurbanne, France
5
LETG—UMR 6554, Université de Bretagne Occidentale, IUEM, CNRS, Technopôle Brest-Iroise, rue Dumont d’Urville, F-29280 Plouzané, France
6
OSU de La Réunion, Université de La Réunion, CS 92003, F-97744 Saint-Denis, France
*
Author to whom correspondence should be addressed.
ISPRS Int. J. Geo-Inf. 2019, 8(6), 267; https://doi.org/10.3390/ijgi8060267
Received: 7 May 2019 / Revised: 28 May 2019 / Accepted: 5 June 2019 / Published: 7 June 2019
(This article belongs to the Special Issue Applications of Photogrammetry for Environmental Research)
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Abstract

In the dual context of coastal hazard intensification and the growing number of stakes exposed to these hazards, coastal observatories are in demand to provide a structured framework dedicated to long-term monitoring. This article describes the drone-based photogrammetry monitoring performed since 2006 on Porsmilin Beach (Brittany, France) in the framework of the DYNALIT (Littoral and Coastline Dynamics) observatory, focusing on data quality and the consistency of long-term time series under the influence of multiple technological evolutions: Unmanned Aerial Vehicles (UAV) platforms with the arrival of electric multirotor drones, processing tools with the development of structure-from-motion (SfM) photogrammetry, and operational modes of survey. A study case is presented to show the potential of UAV monitoring to study storm impacts and beach resilience. The relevance of high-accuracy monitoring is also highlighted. With the current method, an accuracy of 3 cm can be achieved on the digital elevation model (DEM) and the orthophotograph. The question of the representativity and frequency of DEM time points is raised. View Full-Text
Keywords: UAV; SfM photogrammetry; coastal observatory; beach monitoring UAV; SfM photogrammetry; coastal observatory; beach monitoring
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Jaud, M.; Delacourt, C.; Le Dantec, N.; Allemand, P.; Ammann, J.; Grandjean, P.; Nouaille, H.; Prunier, C.; Cuq, V.; Augereau, E.; Cocquempot, L.; Floc’h, F. Diachronic UAV Photogrammetry of a Sandy Beach in Brittany (France) for a Long-Term Coastal Observatory. ISPRS Int. J. Geo-Inf. 2019, 8, 267.

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