Data/hora: 16/06/2024 06:34:34

Provedor de dados: 	5	
País: 	France	
Título: 	Full-Waveform LiDAR Fast Analysis of a Moderately Turbid Bay in Western France	
Autores: 	Launeau, Patrick; Giraud, Manuel; Robin, Marc; Baltzer, Agnes.	
Data: 	2019-01	
Ano: 	2019	
Palavras-chave: 	Full-waveform; Airborne LiDAR; Bathymetry; Shoreline monitoring; Turbidity.	
Resumo: 	In shoreline monitoring, only topo-bathymetric light detection and ranging (LiDAR) can map large corridors from aerial dunes to sandbanks in shallow water. Increasing turbidity masking the formation of 532 nm laser beam echoes on the sea bed makes this challenging. Full-waveform recording all the laser beam damping functions, a turbid water column can be seen as an accumulation of layers forming a single continuum and a distinction can be made between signals ending at the bottom down to a depth of 10 m. In practice full-waveforms are converted by laser beam tracing an image cube with a grid of 1-m-wide pixels and a 0.15 m range resolution storing the mean intensities returned along incident angle. The first derivative of a wide Gaussian filter serves to delineate the full-waveform range limits. Because of turbidity current heterogeneity and complexity of multiple layers radiative transfer model, a drastic simplification is applied by normalizing the cumulative full-waveform to 1, transforming each pixel of the water column into spectrum of intensity ranging from 0 to 1 from bottom to top. A transposition between range and bottom-top information facilitates the water index correction below the sea water level provided by 1064-nm discrete echoes. All echoes remain accessible with maximums of cumulative full-waveform third derivative.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	https://archimer.ifremer.fr/doc/00476/58745/61270.pdf

DOI:10.3390/rs11020117

https://archimer.ifremer.fr/doc/00476/58745/	
Editor: 	MDPI AG	
Formato: 	application/pdf	
Fonte: 	Remote Sensing (2072-4292) (MDPI AG), 2019-01 , Vol. 11 , N. 2 , P. 117 (23p.)	
Fonte: 	info:eu-repo/semantics/openAccess

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