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| Malik, Mashkoor; Schimel, Alexandre C. G.; Masetti, Giuseppe; Roche, Marc; Le Deunf, Julian; Dolan, Margaret F.j.; Beaudoin, Jonathan; Augustin, Jean-marie; Hamilton, Travis; Parnum, Iain. |
| Seafloor backscatter mosaics are now routinely produced from multibeam echosounder data and used in a wide range of marine applications. However, large differences (>5 dB) can often be observed between the mosaics produced by different software packages processing the same dataset. Without transparency of the processing pipeline and the lack of consistency between software packages raises concerns about the validity of the final results. To recognize the source(s) of inconsistency between software, it is necessary to understand at which stage(s) of the data processing chain the differences become substantial. To this end, willing commercial and academic software developers were invited to generate intermediate processed backscatter results from a common... |
| Tipo: Text |
Palavras-chave: Acoustic backscatter processing; Multibeam Echo Sounders; Seafloor mapping. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00599/71133/69448.pdf |
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| Montereale-gavazzi, Giacomo; Roche, Marc; Lurton, Xavier; Degrendele, Koen; Terseleer, Nathan; Van Lancker, Vera. |
| To characterize seafloor substrate type, seabed mapping and particularly multibeam echosounding are increasingly used. Yet, the utilisation of repetitive MBES-borne backscatter surveys to monitor the environmental status of the seafloor remains limited. Often methodological frameworks are missing, and should comprise of a suite of change detection procedures, similarly to those developed in the terrestrial sciences. In this study, pre-, ensemble and post-classification approaches were tested on an eight km2 study site within a Habitat Directive Area in the Belgian part of the North Sea. In this area, gravel beds with epifaunal assemblages were observed. Flourishing of the fauna is constrained by overtopping with sand or increased turbidity levels, which... |
| Tipo: Text |
Palavras-chave: Multibeam; Seafloor backscatter; Change detection; Seafloor integrity; Marine Strategy Framework Directive; Reference calibration area. |
| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00387/49807/50379.pdf |
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