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Title: Compression of Multibeam Echosounders Bathymetry and Water Column Data
Author: Martí, Aniol
Portell i de Mora, Jordi
Amblàs i Novellas, David
de Cabrera, Ferran
Vilà, Marc
Riba, Jaume
Mitchell, Garrett
Keywords: Fons marins
Geologia submarina
Ocean bottom
Submarine geology
Issue Date: 1-May-2022
Publisher: MDPI
Abstract: Over the past decade, Multibeam Echosounders (MBES) have become one of the most used techniques in sea exploration. Modern MBES are capable of acquiring both bathymetric information on the seafloor and the reflectivity of the seafloor and water column. Water column imaging MBES surveys acquire significant amounts of data with rates that can exceed several GB/h depending on the ping rate. These large file sizes obtained from recording the full water column backscatter make remote transmission difficult if not prohibitive with current technology and bandwidth limitations. In this paper, we propose an algorithm to decorrelate water column and bathymetry data, focusing on the KMALL format released by Kongsberg Maritime in 2019. The pre-processing stage is integrated into FAPEC, a data compressor originally designed for space missions. Here, we test the algorithm with three different datasets: two of them provided by Kongsberg Maritime and one dataset from the Gulf of Mexico provided by Fugro USA Marine. We show that FAPEC achieves good compression ratios at high speeds using the pre-processing stage proposed in this paper. We also show the advantages of FAPEC over other lossless compressors as well as the quality of the reconstructed water column image after lossy compression at different levels. Lastly, we test the performance of the pre-processing stage, without the constraint of an entropy encoder, by means of the histograms of the original samples and the prediction errors
Note: Reproducció del document publicat a:
It is part of: Remote Sensing, 2022, vol. 14, num. 9, p. 2063
Related resource:
ISSN: 2072-4292
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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