A navigational chart is the primary source of information for the navigator. The main component that contributes significantly to the safety of navigation is the information on the depth of the area. A sonar, which uses hydro-acoustic waves is a device for bathymetric measurements. It measures the vertical distance between the transducer and the bottom or an object located at the bottom. For the purposes of the article, data was used from an interferometric sonar, which is a modification of a multi-beam sonar. Due to the very wide operating angle, it allows for simultaneous vertical data collection, similar to a typical multi-beam sonar, as well as horizontal data collection, much like a sidescan sonar. Bathymetric data is obtained not only on the basis of measurement of time, in which the acoustic wave reflected from the object returns to the transducer, but also by measuring the phase differences between the various piezoelectric elements within a transducer. The paper presents the test result of bathymetric data processing obtained by the swath sonar GeoSwath +. Data collected during the acquisition was subjected to filtration. For the purpose of the article, the authors used pre-filtered measurement data collected in the area of the Port of Szczecin. However, the filtered samples are large sets of data. Data reduction is a procedure meant to reduce the size of a data set to make it easier and more effective to analyze. This paper examines the capabilities of the GS+ software in the scope of reduced bathymetric data after filtration. The results of different settings are presented in the form of grids, which were then exported to the Surfer 10 software and subjected to detailed analysis.
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