Application of JPEG 2000 Wavelet Compression to Multibeam Echosounder Mid-water Acoustic Refectivity Measurements
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1 University of New Hampshire University of New Hampshire Scholars' Repository Center for Coastal and Ocean Mapping Center for Coastal and Ocean Mapping Application of JPEG 2000 Wavelet Compression to Multibeam Echosounder Mid-water Acoustic Refectivity Measurements Jonathan Beaudoin University of New Hampshire, Durham Follow this and additional works at: Part of the Oceanography and Atmospheric Sciences and Meteorology Commons Recommended Citation Beaudoin, Jonathan, "Application of JPEG 2000 Wavelet Compression to Multibeam Echosounder Mid-water Acoustic Refectivity Measurements" (2010). Canadian Hydrographic Conference This Conference Proceeding is brought to you for free and open access by the Center for Coastal and Ocean Mapping at University of New Hampshire Scholars' Repository. It has been accepted for inclusion in Center for Coastal and Ocean Mapping by an authorized administrator of University of New Hampshire Scholars' Repository. For more information, please contact
2 Application of JPEG 2000 Wavelet Compression to Multibeam Echosounder Mid-water Acoustic Refectivity Measurements This conference proceeding is available at University of New Hampshire Scholars' Repository:
3 Application of JPEG 2000 Wavelet Compression to Multibeam Echosounder Mid-water Acoustic Reflectivity Measurements J. Beaudoin Ocean Mapping Group University of New Brunswick Fredericton, NB Now at Center for Coastal and Ocean Mapping University of New Hampshire Durham, NH
4 120 m 240 m CCGS Amundsen Mackenzie Shelf, EM khz MBES (1.0ºx2.0º)
5 2,500 m NOAAS Okeanos Explorer Northern California Margin EM khz MBES (0.5ºx1.0º) 5,000 m J. V. Gardner, M. Malik, and S. Walker. Plume 1400 Meters High Discovered at the Seafloor off the Northern California Margin. Eos Trans. AGU, 90(32), 2009
6 Data Storage Requirements Logging WC data increases file sizes: CCGS Amundsen, 2009 field season 135 days at sea, continuous MBES logging Regular data: 860 GB (.all files) Water column data: 783 GB (.wcd files) File size grows by factor of 2-8, depending on water depth and angular sector Some (most?) don t bother logging WC, especially in shallow water
7 Recording Interesting Data only How do you define interesting?
8
9 Solution? Courtney (2008) applied JPEG2000 to seismic & sidescan and suggested use for MBES JPEG2000: Discrete Wavelet Transform (DWT) Lossless and Lossy methods available JasPer implementation of JPEG2000 Freely available open source library Reasonably documented Implemented in many open source applications R. Courtney. Storage and dissemination of SEGY data in JPEG2000 format. In Proc. Shallow Survey 2008, Oct2008.
10 Implementation angle time time Beam/angle Raw JPEG2000 image is stored along with WC datagram header along with metadata Ping-by-ping approach is ideally suited for real-time compression JPEG2000 (20:1)
11 Evaluation MV G.B. Church, purposely sunk in 1991 Mapped with EM3002 in 2006 (CCGS Otter Bay) 12 passes, only 1 pass fully imaged mast (1,064MB of data, 899MB of WC) Wreck imaged over 170 pings
12 Results: Lossless Compression Ratios 2.5:1 (raw image compared to JPEG2000) Effective ratio only 1.5:1 due to zero padding Still better than WinZip: JPEG2000: packs down file size to 68% Lempel-Ziv: packs down file size to 75%
13 Results: Lossy Compression Raw 10:1 20:1 40:1 80:1
14 Quantifying Effects of Lossy Compression
15 Wreck Measurement threshold wmt
16 Wreck Measurement Raw 20:1 threshold wmt
17 Mean Anomaly 20:1
18 Anomaly Std. Deviation 20:1
19 Wreck Measurement Performance 20:1 Threshold
20 Wreck Measurement Performance 20:1 WMT
21 Conclusion JPEG 2000 compression easily applicable to MBES water column data Lossless: ratios of 1.5:1 achievable Lossy: 20:1 seems a good compromise for hydrographic purposes Application specific metrics should be devised Compression enables discovery
22 Take Home Message? Lossy compression applied in real-time would allow for continuous WC recording in shallow water Help fulfill hydrographic detection requirements Provide invaluable contextual information for data cleaning
23 Acknowledgements ArcticNet NCE Sponsors of the OMG Officers and Crew of CCGS Otter Bay Robert Courtney, GSC (Atlantic)
24 Questions?
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