Backscatter Working Group Software Inter-comparison ProjectRequest...

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Backscatter Working Group Software Inter-comparison Project
Requesting and Comparing Intermediate Backscatter Processing R...

Why?
● Validation of backscatter processing steps
○ Using same data set, may result in different final products
○ Need inp...

Example of end user frustration !
(Mosaic to mosaic comparison)
End result of backscatter mosaic offers little insight as
...

What are we proposing?
A collaborative project between data users and software developers:
● Goal 1: Collectively come to ...

Backscatter data processing sequence
(Schimel et al. 2018)

Backscatter data processing sequence
(Schimel et al. 2018)
Current outputs

Current outputs
Current outputs

BSWG recommended processing stages
Current outputs
Recommended outputs
Metadata
Metadata

BSWG recommended processing stages
Current outputs
Recommended outputs
Metadata
Metadata
Available Sept 2018
CARIS and Son...

The inter-comparison dataset
Kongsberg EM302
Johnston Atoll area
NOAA - USA
Teledyne 7125
Wembury Bay UK
Shallow survey 20...

Phase I: Request intermediate results from software
ASCII export in Ping Beam geometry with backscatter as provided by son...

Processing status (Sept 2018)
Software KB 710 KB 302 KB 3002 KB 2040 Reson 7125
Sonar Scope
FMGT
CARIS
Curtin
Hypack
Swath...

Backscatter results provided by different vendors
Software SonarScope FMGT CARIS Curtin
# columns 31 12 17 11
Time stamp P...

RV Simon Stevin EM2040 single Rx L0005_20160412_104116.all (300kHz, 216µs)
Kwinte reference gravel and sandy gravel area
b...

RV Simon Stevin EM2040 single Rx L0005_20160412_104116.all (300kHz, 216µs)
Kwinte reference gravel and sandy gravel area B...

(First 100,000 data points)

Why is CARIS incidence angles different ?

Within 5 cm
RV Simon Stevin EM2040 single Rx L0005_20160412_104116.all (300kHz, 216µs)
EM 2040 Depth (One Ping)

Within 15 dB
RV Simon Stevin EM2040 single Rx L0005_20160412_104116.all (300kHz, 216µs)
EM 2040 Backscatter (One Ping)

RV Simon Stevin EM2040 single Rx L0005_20160412_104116.all (300kHz, 216µs)
Kwinte reference gravel and sandy gravel area

EM302 L0213_20170717_112534_EX1706.all (main frequency =27.75kHz, pl = 40ms)
Johnston Atoll area
Processing of data from S...

EM302 L0213_20170717_112534_EX1706.all (main frequency =27.75kHz, pl = 40ms)
Johnston Atoll area
(One survey line)
- 26.5 ...

EM302 L0213_20170717_112534_EX1706.all (main frequency =27.75kHz, pl = 40ms)
Johnston Atoll area

EM302 L0213_20170717_112534_EX1706.all (main frequency =27.75kHz, pl = 40ms)
Johnston Atoll area
(One survey line)

(First 100,000 data points)
EM302 L0213_20170717_112534_EX1706.all (main frequency =27.75kHz, pl = 40ms)
Johnston Atoll ar...

EM710 0002_20130214_091514_borda.all (main frequency=81kHz, pl=0.3ms)
SHOM reference area
Processing of data from Sonarsco...

EM710 0002_20130214_091514_borda.all (main frequency=81kHz, pl=0.3ms)
SHOM reference area
-19.3 dB
-14.5 dB
- 10.4 dB

EM710 0002_20130214_091514_borda.all (main frequency=81kHz, pl=0.3ms)
SHOM reference area

EM710 0002_20130214_091514_borda.all (main frequency=81kHz, pl=0.3ms)
… area

EM710 0002_20130214_091514_borda.all (main frequency=81kHz, pl=0.3ms)
SHOM reference area

RESON 7125 20140729_082527_SMB Owen.s7k
Shallow Survey 2015
Processing of data from Sonarscope, FMGT and Curtin
1. GIS int...

40 dB
- 55 dB
40 dB
RESON 7125 20140729_082527_SMB Owen.s7k
Shallow Survey 2015

RESON 7125 20140729_082527_SMB Owen.s7k
Shallow Survey 2015

Discussions needed
1. Large unexplained differences among results BL0 and BL3
2. An initial step to show that differences ...

Next Steps
● Revisit calculations of BL0
● Request other intermediate
processing results
● 2nd round of processing after
a...

We need your support !!
● Users: To demand results processed by different tools should agree
reasonably with each other
○ ...

Questions
Mashkoor Malik (mashkoor.malik@noaa.gov)
Alexandre C. G. Schimel (alexandre.schimel@niwa.co.nz)
Marc Roche (Marc...

References cited
Lamarche G, Lurton X. 2017. Recommendations for improved and coherent acquisition and processing of backs...

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