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A comparison of seafloor sonar classification methods through the use of error matrices and 3 dimensional GIS visualization : a multibeam sonar investigation of Nehalem Bank, Oregon

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dc.contributor.advisor Goldfinger, Chris
dc.creator Lanier, Andrew S.
dc.date.accessioned 2006-08-16T16:41:56Z
dc.date.available 2006-08-16T16:41:56Z
dc.date.copyright 2006-07-17
dc.date.issued 2006-07-17
dc.identifier.uri http://hdl.handle.net/1957/2926
dc.description Graduation date: 2007
dc.description.abstract Multibeam sonar data was collected on Nehalem Bank, off of the Oregon Coast with the purpose of increasing the spatial resolution of our knowledge of the area and delineating seafloor habitats. The system used was the Kongsberg Simrad EM-300 operating at 30 kHz. The data set collected includes both topographic and backscatter information, both of which were processed and gridded at a 5m cell-size resolution. This thesis summarizes the methods used in the characterization of seafloor habitat using the Nehalem Bank data and the analysis tools incorporated within a geographic information system (GIS). This work focuses on investigations into the analysis of benthic habitats through the use of algorithmic calculations at multiple scales to quantitatively delineate distinct seafloor regions. A recently developed spatial analysis technique, the bathymetric position index (BPI), was tested and used as part of the Benthic Terrain Modeler Tool to classify the Nehalem Bank data. Those results were compared both qualitatively and quantitatively to a newly developed method (developed for this project) entitled the surface interpretation method (SIM). Both methods of classification use multiple scales of BPI in conjunction with the topographic digital elevation model (DEM) to quantitatively delineate seafloor habitats. While accuracy assessments of remotely sensed imagery on land are usually carried out using groundtruthing information collected specifically for that purpose, sonar imagery is often assessed using any information available. The groundtruth data available for Nehalem Bank is sparsely located throughout the region and includes: submersible dives, sample data, and seismic and sidescan imagery. In order to evaluate the fit of the classification attempts to the DEM quantitatively, a set of reference points was created and interpreted using the three dimensional (3D) visualization capabilities of a GIS. The results were analyzed using error matrix statistical measures that provided a quantitative assessment of the classification results, the feedback from which guided a refinement of the classification methods. This was done in attempt to optimize “real-world” evaluation of a classification methods results, without an idealized level of seafloor groundtruth data. The backscatter component of the data was processed to reduce the influence of grazing angle on the intensity of surface returns, a common source of noise that dominates many datasets. The processed image shows a reduced variability of the grey level of the imagery in both along and across track directions. Submersible dive groundtruth data were then co-located with the backscatter imagery using habitat interpretations of the dives displayed upon the DEM. The backscatter data was then classified in the regions of the dives using textural analysis with grey level co-occurrence matrix derived indices of homogeneity and entropy. The resulting substrate class divisions satisfactorily parsed the landscape into habitat regions, with the exceptions of the nadir and shadow regions. However, higher frequency deep-towed sidescan imagery in the same region shows that the delineation of substrate regions appears to be incorrect with the EM300 imagery likely imaging subsurface seafloor characteristics. en
dc.format.extent 9395230 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.subject seafloor en
dc.subject sonar en
dc.subject classification en
dc.subject multibeam en
dc.subject GIS en
dc.subject.lcsh Ocean bottom -- Oregon -- Nehalem Bank -- Remote sensing en
dc.subject.lcsh Benthos -- Habitat -- Oregon -- Nehalem Bank -- Remote sensing en
dc.subject.lcsh Sonar en
dc.subject.lcsh Nehalem Bank (Or.) -- Remote sensing en
dc.title A comparison of seafloor sonar classification methods through the use of error matrices and 3 dimensional GIS visualization : a multibeam sonar investigation of Nehalem Bank, Oregon en
dc.type Thesis en
dc.degree.name Master of Science (M.S.) in Marine Resource Management en
dc.degree.level Master's en
dc.degree.discipline Oceanic and Atmospheric Sciences en
dc.degree.grantor Oregon State University en
dc.contributor.committeemember Wakefield, Waldo
dc.contributor.committeemember Wright, Dawn
dc.contributor.committeemember Rockefort, Willie

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