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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
US Hydro Conference March 2019
Biloxi, MS, USA
BSIP: Backscatter Software Intercomparison Project
Preliminary Evaluation of Multibeam Backscatter Consistency through Comparison of Intermediate Processing Results
Project Collaborators:
SonarScope, IFREMER
FMGT, QPS
HIPS & SIPS, Teledyne CARIS
MB Process, Curtin University, CMST
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
Example of end user frustration
(mosaics comparison)
End result of backscatter mosaic offers little insight as to
what went wrong and where?
Lucieer et al. (2017); Roche et al. (2018)
BSIP → Processing Steps
BL0
Level “as read from
datagram”
BL3
Level after all corrections
applied before mosaicking
BSIP requested intermediate levels
(provided by software developers)
Currently produced
results
BSIP dataset
EM 2040 Bathymetry
Software results match !!
-11.5 dB
-15 dB
-17 dB
EM 2040 Backscatter
CARIS BL3
CARIS BL0
FMGT BL3
FMGT BL0
SonarScope BL0
SonarScope BL3
EM 2040 Backscatter
Large differences not an isolated case !!
EM 302 EM 710
RESON 7125
Intermediate processing stages enable further insights
BL3 - BL0
(CARIS BL3 - CARIS BL0) - (FMGT BL3 - FMGT BL0)
(CARIS BL0 - FMGT BL0)
→ Processing approach between
BL0 and BL3 is different
Difference in processing relative to difference in starting value
→ Differences in starting value explains the difference in
processed results for most of the soundings
CARIS FMGT
Sonar
Scope
CARIS /
FMGT
FMGT/Sonar
Scope
CARIS / Sonar
Scope
Conclusions
● Intermediate processing stages provides insights into differences
between software outputs
○ Differences in level “as read in the datagrams” BL0 a surprise
● A variety of processing approaches available
○ Improved tools needed to understand impact of one choice vs. another
● Next steps
○ Round 2 processing in progress to provide other intermediate stages (corrections)
● 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 agreed best practices for backscatter
processing
○ BSWG: To provide a platform to facilitate these discussions
Questions ?
Alexandre C. G. Schimel (alexandre.schimel@niwa.co.nz)
Mashkoor Malik (mashkoor.malik@noaa.gov)
Marc Roche (Marc.Roche@economie.fgov.be)
Giuseppe Masetti (gmasetti@ccom.unh.edu)
Margaret Dolan (Margaret.Dolan@ngu.no)
Julian Le Deunf (julian.le.deunf@shom.fr)
Thanks to software developers

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BSIP: Backscatter Software Intercomparison Project - Preliminary Evaluation of Multibeam Backscatter Consistency through Comparison of Intermediate Processing Results

  • 1. 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 US Hydro Conference March 2019 Biloxi, MS, USA BSIP: Backscatter Software Intercomparison Project Preliminary Evaluation of Multibeam Backscatter Consistency through Comparison of Intermediate Processing Results Project Collaborators: SonarScope, IFREMER FMGT, QPS HIPS & SIPS, Teledyne CARIS MB Process, Curtin University, CMST
  • 2. 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
  • 3. Example of end user frustration (mosaics comparison) End result of backscatter mosaic offers little insight as to what went wrong and where? Lucieer et al. (2017); Roche et al. (2018)
  • 4. BSIP → Processing Steps BL0 Level “as read from datagram” BL3 Level after all corrections applied before mosaicking BSIP requested intermediate levels (provided by software developers) Currently produced results
  • 6. EM 2040 Bathymetry Software results match !!
  • 7. -11.5 dB -15 dB -17 dB EM 2040 Backscatter CARIS BL3 CARIS BL0 FMGT BL3 FMGT BL0 SonarScope BL0 SonarScope BL3
  • 9. Large differences not an isolated case !! EM 302 EM 710 RESON 7125
  • 10. Intermediate processing stages enable further insights BL3 - BL0 (CARIS BL3 - CARIS BL0) - (FMGT BL3 - FMGT BL0) (CARIS BL0 - FMGT BL0) → Processing approach between BL0 and BL3 is different Difference in processing relative to difference in starting value → Differences in starting value explains the difference in processed results for most of the soundings CARIS FMGT Sonar Scope CARIS / FMGT FMGT/Sonar Scope CARIS / Sonar Scope
  • 11. Conclusions ● Intermediate processing stages provides insights into differences between software outputs ○ Differences in level “as read in the datagrams” BL0 a surprise ● A variety of processing approaches available ○ Improved tools needed to understand impact of one choice vs. another ● Next steps ○ Round 2 processing in progress to provide other intermediate stages (corrections) ● 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 agreed best practices for backscatter processing ○ BSWG: To provide a platform to facilitate these discussions
  • 12. Questions ? Alexandre C. G. Schimel (alexandre.schimel@niwa.co.nz) Mashkoor Malik (mashkoor.malik@noaa.gov) Marc Roche (Marc.Roche@economie.fgov.be) Giuseppe Masetti (gmasetti@ccom.unh.edu) Margaret Dolan (Margaret.Dolan@ngu.no) Julian Le Deunf (julian.le.deunf@shom.fr) Thanks to software developers