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dc.contributor.authorChristensen, Olenb_NO
dc.date.accessioned2014-12-19T13:42:34Z
dc.date.accessioned2015-12-22T11:39:45Z
dc.date.available2014-12-19T13:42:34Z
dc.date.available2015-12-22T11:39:45Z
dc.date.created2008-02-18nb_NO
dc.date.issued2006nb_NO
dc.identifier123517nb_NO
dc.identifier.isbn82-471-7876-3nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/2368803
dc.description.abstractBathymetrical mapping performed using multibeam sonar systems is widely used in marine science and for habitat mapping. The incoherent part of the multibeam data, the backscatter data, is less commonly used. Automatic classification of processed backscatter has a correlates well with three sediment classes, defined as fine-(clay-silt), medium- (sand) and coarse- (gravel–till) grained substrates. This relation is used directly as a theme in a modified habitat classification scheme, while a more detailed substrate classification is incorporated as another theme. This theme requires a manual interpretation and comprehensive knowledge of the substrate. This can partly be obtained by a newly developed technique using the backscatter strength plotted against the grazing angle. These plots make it possible to determine the critical angle and thereby calculate the compressional acoustic speed in seabed sediments. Marching a theoretical modeled backscatter curve to the measured backscatter strength at lower grazing angles provides estimates of four additional geoacoustic parameters.nb_NO
dc.languageengnb_NO
dc.publisherFakultet for informasjonsteknologi, matematikk og elektroteknikknb_NO
dc.relation.ispartofseriesDoktoravhandlinger ved NTNU, 1503-8181; 2006:64nb_NO
dc.relation.haspartFosså, Jan Helge; Lindberg, Björn; Christensen, Ole; Lundälv, Tomas; Svellingen, Ingvald; Mortensen, Pål B; Alvsvåg, John. Mapping of Lophelia reefs in Norway: experiences and survey methods.. Cold-water Corals and Ecosystems: 359-391, 2005.nb_NO
dc.titleSUSHIMAP (Survey strategy and methodology for marine habitat mapping)nb_NO
dc.typeDoctoral thesisnb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for informasjonsteknologi, matematikk og elektroteknikk, Institutt for elektronikk og telekommunikasjonnb_NO


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