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Fecha
2014-01-25
Derechos de acceso
info:eu-repo/semantics/openAccess
Título de la revista
ISSN de la revista
Título del volumen
Editorial
Elsevier
Citas
Resumen
Sea bottom classification using echosounders is an active field of research, where many different methods (to define echo features or perform their statistical classification) have been proposed and tested. Here we propose a new echo correction method suitable for use in coastal waters, where large relative depth variations occur. The idea is based on scaling the pulse length with depth as suggested by Pouliquen (Preston et al., 2004. Proceedings of the Seventh European Conference on Underwater Acoustics, ECUA 2004), but instead of in real time, in postprocessing. We investigate, in particular, the benefits of this correction for a classification based on the energy integrals of first and second return echoes, relying on the correction to find an optimal definition for those energy integrals. The method is tested in a coastal area survey with substrates varying over small scales (less than 200 m) and with large relative changes in water depth (5–40 m and slopes of up to 0.2). We show that the unsupervised classification bears a good agreement with divers groundtruthing (85% agreement with a Cohen׳s kappa, κ=0.74 for a 4-class map) and with previous knowledge of the study area.
Descripción
This is an Accepted Manuscript of an article published by Elsevier in "Continental Shelf Research, 77:1-13", available at: https://doi.org/10.1016/j.csr.2014.01.012
Este es el manuscrito aceptado del artículo publicado por Elsevier en "Continental Shelf Research, 77:1-13", disponible en línea: https://doi.org/10.1016/j.csr.2014.01.012
Este es el manuscrito aceptado del artículo publicado por Elsevier en "Continental Shelf Research, 77:1-13", disponible en línea: https://doi.org/10.1016/j.csr.2014.01.012
Categorías UNESCO
Palabras clave
Benthic habitat classification, Cluster classification, Echo correction, PCA analysis, Ping-length correction, Single-beam
Citación
Rodríguez Pérez, Daniel, Sanchez Carnero, Noela, Freire, Juan, (2014). “A pulse-length echo correction to improve energy based seabed classification in coastal areas”. Continental Shelf Research, 77:1-13; DOI:10.1016/j.csr.2014.01.012
Centro
Facultad de Ciencias
Departamento
Física Matemática y de Fluídos