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Comparison of a self-processed EM3000 multibeam echosounder dataset with a QTC view habitat mapping and a sidescan sonar imagery, Tamaki Strait, New Zealand

Schimel, Alexandre C.G., Healy, Terry R., McComb, Peter and Immenga, Dirk 2010, Comparison of a self-processed EM3000 multibeam echosounder dataset with a QTC view habitat mapping and a sidescan sonar imagery, Tamaki Strait, New Zealand, Journal of coastal research, vol. 26, no. 4, pp. 714-725, doi: 10.2112/08-1132.1.

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Title Comparison of a self-processed EM3000 multibeam echosounder dataset with a QTC view habitat mapping and a sidescan sonar imagery, Tamaki Strait, New Zealand
Author(s) Schimel, Alexandre C.G.
Healy, Terry R.
McComb, Peter
Immenga, Dirk
Journal name Journal of coastal research
Volume number 26
Issue number 4
Start page 714
End page 725
Total pages 12
Publisher Coastal Education and Research Foundation
Place of publication Fort Lauderdale, Fla.
Publication date 2010
ISSN 0749-0208
1551-5036
Keyword(s) MBES
SBES
SSS
AGDS
reflectivity
backscatter
seafloor slope
XTF
Te Matuku marine reserve
Summary A methodology for automatically processing the data files from an EM3000 multibeam echosounder (Kongsberg Maritime, 300 kHz) is presented. Written in MatLab, it includes data extraction, bathymetry processing, computation of seafloor local slope, and a simple correction of the backscatter along-track banding effect. The success of the latter is dependent on operational restrictions, which are also detailed. This processing is applied to a dataset acquired in 2007 in the Tamaki Strait, New Zealand. The resulting maps are compared with a habitat classification obtained with the acoustic ground-discrimination software QTC View linked to a 200-kHz single-beam echosounder and to the imagery from a 100-kHz sidescan sonar survey, both performed in 2002. The multibeam backscatter map was found to be very similar to the sidescan imagery, quite correlated to the QTC View map on one site but mainly uncorrelated on another site. Hypotheses to explain these results are formulated and discussed. The maps and the comparison to prior surveys are used to draw conclusions on the quality of the code for further research on multibeam benthic habitat mapping.
Language eng
DOI 10.2112/08-1132.1
Field of Research 070402 Aquatic Ecosystem Studies and Stock Assessment
Socio Economic Objective 960507 Ecosystem Assessment and Management of Marine Environments
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2010, Coastal Education and Research Foundation
Persistent URL http://hdl.handle.net/10536/DRO/DU:30056209

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