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Provedor de dados:  ArchiMer
País:  France
Título:  LiDAR Validation of a Video-Derived Beachface Topography on a Tidal Flat
Autores:  Didier, David
Bernatchez, Pascal
Augereau, Emmanuel
Caulet, Charles
Dumont, Dany
Bismuth, Eliott
Cormier, Louis
Floc'H, France
Delacourt, Christophe
Data:  2017-08
Ano:  2017
Palavras-chave:  Video monitoring
Shoreline detection
Beach morphology
Mobile terrestrial LiDAR
Erosion
Atlantic Canada
Resumo:  Increasingly used shore-based video stations enable a high spatiotemporal frequency analysis of shoreline migration. Shoreline detection techniques combined with hydrodynamic conditions enable the creation of digital elevation models (DEMs). However, shoreline elevations are often estimated based on nearshore process empirical equations leading to uncertainties in video-based topography. To achieve high DEM correspondence between both techniques, we assessed video-derived DEMs against LiDAR surveys during low energy conditions. A newly installed video system on a tidal flat in the St. Lawrence Estuary, Atlantic Canada, served as a test case. Shorelines were automatically detected from time-averaged (TIMEX) images using color ratios in low energy conditions synchronously with mobile terrestrial LiDAR during two different surveys. Hydrodynamic (waves and tides) data were recorded in-situ, and established two different cases of water elevation models as a basis for shoreline elevations. DEMs were created and tested against LiDAR. Statistical analysis of shoreline elevations and migrations were made, and morphological variability was assessed between both surveys. Results indicate that the best shoreline elevation model includes both the significant wave height and the mean water level. Low energy conditions and in-situ hydrodynamic measurements made it possible to produce video-derived DEMs virtually as accurate as a LiDAR product, and therefore make an effective tool for coastal managers.
Tipo:  Text
Idioma:  Inglês
Identificador:  https://archimer.ifremer.fr/doc/00638/75022/75656.pdf

DOI:10.3390/rs9080826

https://archimer.ifremer.fr/doc/00638/75022/
Editor:  Mdpi
Formato:  application/pdf
Fonte:  Remote Sensing (2072-4292) (Mdpi), 2017-08 , Vol. 9 , N. 8 , P. 826 (22p.)
Direitos:  info:eu-repo/semantics/openAccess

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