Seafloor mapping based on multibeam echosounder bathymetry and backscatter data using Object-Based Image Analysis : a case study from the Rewal site, the Southern Baltic

• Autorzy: Janowski Ł. , Tegowski J. , Nowak J.

Identyfikatory

DOI

10.1515/ohs-2018-0024

• Języki publikacji: EN

Abstrakty

EN

Seafloor mapping is a fast developing multidisciplinary branch of oceanology that combines geophysics, geostatistics, sedimentology and ecology. One of its objectives is to isolate distinct seabed features in a repeatable, fast and objective way, taking into consideration multibeam echosounder (MBES) bathymetry and backscatter data. A large-scale acoustic survey was conducted by the Maritime Institute in Gdańsk in 2010 using Reson 8125 MBES. The dataset covered over 20 km² of a shallow seabed area (depth of up to 22 m) in the Polish Exclusive Economic Zone within the Southern Baltic. Determination of sediments was possible based on ground-truth grab samples acquired during the MBES survey. Four classes of sediments were recognized as muddy sand, very fine sand, fine sand and clay. The backscatter mosaic created using the Angular Variable Gain (AVG) empirical method was the primary contribution to the image processing method used in this study. The use of the Object-Based Image Analysis (OBIA) and the Classification and Regression Trees (CART) classifier makes it possible to isolate the backscatter image with 87.5% overall and 81.0% Kappa accuracy. The obtained results confirm the possibility of creating reliable maps of the seafloor based on MBES measurements. Once developed, the OBIA workflow can be applied to other spatial and temporal scenes.

Słowa kluczowe

EN

Angle Varied Gain; classification and regression trees; feature selection; habitat mapping; image processing; multibeam echosounder; object-based Image Analysis; Southern Baltic

• Wydawca: Institute of Oceanography University of Gdańsk
• Czasopismo: Oceanological and Hydrobiological Studies
• Rocznik: 2018
• Tom: Vol. 47, No. 3
• Strony: 248--259
• Opis fizyczny: Bibliogr. 51 poz.

Twórcy

autor

Janowski Ł.

• Institute of Oceanography, University of Gdansk, Al. M. Piłsudskiego 46, 81-378 Gdynia, Poland

autor

Tegowski J.

• Institute of Oceanography, University of Gdansk, Al. M. Piłsudskiego 46, 81-378 Gdynia, Poland

autor

Nowak J.

• Maritime Institute in Gdansk, ul. Długi Targ 41/42, 80-830 Gdansk, Poland

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).