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Published byἈδελφός Βλαχόπουλος Modified over 5 years ago
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BSIP: Backscatter Software Intercomparison Project
Preliminary Evaluation of Multibeam Backscatter Processing Consistency (A project of Geohab Backscatter Working Group) Project Facilitators: Mashkoor Malik, NOAA, USA Giuseppe Masetti, UNH CCOM/JHC, USA Alexandre Schimel, NIWA, New Zealand Marc Roche, ECONOMIE, Belgium Margaret Dolan, NGU, Norway Julian Le Deunf, SHOM, France Project Collaborators: SonarScope, IFREMER FMGT, QPS HIPS & SIPS, Teledyne CARIS MB Process, Curtin University, CMST US Hydro Conference March 2019 Biloxi, MS, USA
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BSIP → Rationale Significant differences in backscatter products
generated by different software using the same dataset Major limitation for: Quantitative analysis Combining multiple sources Time-monitoring of seafloor changes Data quality validation Although backscatter mosaics of the seafloor are now routinely produced from multibeam sonar data, significant differences have been observed in the products generated by different software when processing the same dataset. This represents a major limitation to a number of possible uses of backscatter mosaics, including quantitative analysis, monitoring seafloor change over time, and combining results from multiple data sources. BSIP: Backscatter Software Intercomparison Project
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Example of end user frustration (mosaics comparison)
Coarse Fine End result of backscatter mosaic offers little insight as to what went wrong and where? Lurton and Lamarche (2015); Lucieer et al. (2018); Roche et al. (2018)
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BSIP → Processing Steps
Currently produced results BL0 Level “as read from datagram” BL3 Level after all corrections applied before mosaicking BSIP requested intermediate levels (provided by software developers) Radiometric corrections: -Gains applied in reception -Propagation through the water-column -Interaction with the seafloor -Mechanical properties of the transducer Schimel et al. (2018)
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Carré Renard reference area
BSIP dataset Kongsberg EM302 Johnston Atoll area NOAA - USA Teledyne 7125 Wembury Bay UK Shallow survey 2015 Kongsberg EM710 and EM3002 Carré Renard reference area SHOM - FRANCE Kongsberg EM2040 Kwinte reference area FPS Economy - BELGIUM BSIP: Backscatter Software Intercomparison Project
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EM 2040 Bathymetry Software results match !!
Sonar Scope CARIS QPS Kwinte reference gravel and sandy gravel area RV Simon Stevin EM2040 single Rx L0005_ _ all (300 kHz, 216µs) Depth (m)
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EM 2040 Backscatter CARIS BL3 -11.5 dB CARIS BL0 FMGT BL3 FMGT BL0
SonarScope BL3 SonarScope BL0 -17 dB dB
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EM 2040 Backscatter
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Large differences not an isolated case !!
EM 302 RESON 7125 EM 710 Johnston Atoll area EM302 L0213_ _112534_EX1706.all (main frequency = 27.75kHz, pl = 40ms)
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Intermediate processing stages enable further insights
BL3 - BL0 (CARIS BL3 - CARIS BL0) - (FMGT BL3 - FMGT BL0) (CARIS BL0 - FMGT BL0) CARIS / Sonar Scope FMGT/ Sonar Scope Sonar Scope CARIS / FMGT CARIS FMGT Processing of BL3 from BL0 is different for each software Difference in processing relative to starting value
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Summary Intermediate processing stages provides insights into differences between software outputs A variety of processing approaches available A possible method without compromising proprieatary information Round 2 processing in progress Software developers requested to provide outputs from other intermediate stages We need your help !! Users: To demand that results processed by different software should agree with each other Software developers: To work together to implement best practices for backscatter processing Backscatter Working Group: To continue to provide a platform to facilitate these discussions
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Thanks to software developers
Questions ? Mashkoor Malik Giuseppe Masetti Alexandre C. G. Schimel Marc Roche Margaret Dolan Julian Le Deunf Thanks to software developers
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References Lucieer V, Roche M, Degrendele K, Malik M, Dolan M, Lamarche G User expectations for multibeam echo sounders backscatter strength data-looking back into the future. Mar. Geophys. Res. 39:23-40. Roche M, Degrendele K, Vrignaud C, Loyer S, Le Bas T, Augustin J-M, Lurton X Control of the repeatability of high frequency multibeam echosounder backscatter by using natural reference areas. Mar. Geophys. Res. 39: Schimel ACG, Beaudoin J, Parnum IM, Le Bas T, Schmidt V, Gordon K, Ierodiaconou D Multibeam sonar backscatter data processing. Mar. Geophys. Res. 39: Lamarche G, Lurton X Recommendations for improved and coherent acquisition and processing of backscatter data from seafloor-mapping sonars. Mar. Geophys. Res. 39:5-22. Lurton X, Lamarche G Backscatter measurements by seafloor-mapping sonars. Guidelines and recommendations. Retrieved 27th April 2018 from Malik, M.; Lurton, X.; Mayer, L A framework to quantify uncertainties of seafloor backscatter from swath mapping echosounders. Mar. Geophys. Res. 39, 151–168.
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