2019_programme: MULTIBEAM AND SINGLEBEAM MULTIFREQUENCY CLASSIFICATION OF BOTTOM HABITATS - THE COMPLEMENTATION OF TWO APPROACHES

• Session: 18. Multibeam Echo Sounding: Bathymetry and sediment Classification
  Organiser(s): Simons Dick, Snellen Mirjam 
• Lecture: MULTIBEAM AND SINGLEBEAM MULTIFREQUENCY CLASSIFICATION OF BOTTOM HABITATS - THE COMPLEMENTATION OF TWO APPROACHES [invited]
  Paper ID: 911
  Author(s): Tegowski Jaroslaw, Janowski Lukasz, Trzcinska Karolina, Rucinska-Zjadacz Maria, Kruss Aleksandra, Zdroik Jakub, Pocwiardowski Pawel, Kusek Klaudia
  Presenter: Tegowski Jaroslaw
  Presentation type: oral
  Abstract: The development of multi-frequency multibeam (MBES) and singlebeam (SBE) echosounders has enabled progress in acoustical classification methods for bottom sediments and habitats. In this study we present the results of habitat classification based on the image analysis of bathymetry and backscattering strength maps recorded by MBES NORBIT iWBMS (model STX) at frequencies of 150kHz and 400kHz and analyses of echo envelopes recorded by SBE Simrad EK 80 at frequencies of 38kHz, 120kHz and 333kHz. The survey was carried out in the South Baltic Sea on an area of approximately 1.2 km2, where the southern boundary of the study polygon was 1 km distant from the Rowy harbour. The Rowy area is characterized by diverse habitat conditions and presence of marine vegetation unique in this part of the Baltic Sea. \nThe MBES data approach consisted of an extraction of features of bathymetric and backscatter data, including statistical and textural features. Another data set was calculated for single-beam echosounder signals, including echo energy parameters and wavelet transform parameters for all the three frequencies. Automatic classification methods utilized fuzzy logic and k-means algorithms.\nBased on the ground-truth samples and ROV seafloor images we have identified six habitat classes and selected the most relevant features of the bathymetric and backscatter data.\nThe results of the valid classification exceeded 90%, demonstrating that the combination of measurements with multi and single beam echosounders as well as multifrequency registrations can advance progress in habitat mapping, which is one of the goals of the ECOMAP EU BONUS project.\n
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• Corresponding author: Dr Tegowski Jaroslaw
  Affiliation: University of Gdansk
  Country: Poland
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