水産業における情報技術の活用について-III. : Wavelet変換による高速ノイズ除去と海底地形図

概要

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The low-cost sounding system measuring the shallow sea bottom topography for fishing industry has been presented in this study. The outline of the system is that the position data obtained by GPS and seawater depths measured by a fishing echo sounder on fishing vessels are accrued by the general sensor platform namely "Micro Cube" then those are stored into the database server to create a map of sea bottom topography. Since the accrued data include noises and burst errors due to the double reflections in water depths, the authors have examined the data analysis for removing suspicious water depths due to the double reflection from the bathymetric chart in our previous study. In this paper, the authors discuss other effective and general analytical method for erasing noises by a low-pass filtering based on the Discrete Wavelet Transform and statistics. The effectiveness of this investigation is examined using the experimental data carried out using 4 fishing vessels in Rumoi on the west coast of Hokkaido, Japan.
2008-03-25