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February 2007
1
SonarScopeOverview
Jean-Marie AugustinIfremer, Brest, France
Acoustics & Seismics Dept
February 2007
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SonarScope : The sonar « photoshop»
Click right to access menuand use « Author comments »
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SonarScope : Principal or complementary tool
Sensor SonarScopeRaw data logger
GIS
Customer Bathymetry processing DTM
Customer Imagery processing
Backscatter mosaic
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SonarScope : Tree domains of application
• Quality control
• Data processing
• Help for interpretation
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SonarScope : Multilayer data
Tx Sector
Beam #
Range ; time ; sample#
Depth Reflectivity
Incidentangle
And also (e.g.) :• Detection type (amplitude/phase)• Transmit angle• Mode, roll, pitch, heave…• Etc.
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SonarScope : Example of multilayer data
Tx Angle TxBeamIndexReflectivityDepth
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Artefacts
SonarScope : QualityControl
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Limits of Tx beams
SonarScope : QualityControl
Port Tx beamStarboard Tx beam
Central Tx beam
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SonarScope : Quality Control
Starboard Tx beamPort Tx beam
Central Tx beam
• Multi-layer statistics : mean of reflectivity vs Tx Angle grouped by Tx sectors
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Compensated image
SonarScope : QualityControl
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SonarScope : QualityControl
Raw Data Compensated Data
EM300 data, Calimero Grid size : 2,5 m
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SonarScope : Quality Control
• Multi-layer statistics : Bathymetry minus tilted plan vs RxBeamIndex grouped by TxBeamIndex
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SonarScope : Data Processing
• An abstraction model for all MBES andSidescan sonars�Transmission beams�Reception beams�BS�TVG, NE, Insonified Area, etc …
• An abstraction model for sonar data�Geometry�Data information
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SonarScope : Data Processing
• All geometry transformations
GeoYX
PingSamplesPingBeam
LatLong
PingSwath
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• Each swath line is a mosaic image
• The Tx angle is « mosaicked »
• A pixel replaces another one only if the absolute value of its transmission angle is lower than the resident pixel : lines are separated by the iso-accuracy limit
Depth accuracy(% of errors)
θθθθOverlap area
Line 1 Line 2 Line 3
Iso-accuracy limit
SonarScope : Swathoverlap processing
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Transmission angle mosaic
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DTM with overlap
processing
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DTM without overlap
processing
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SonarScope : Help for Interpretation
• Multiple format exportation, Free viewers,WMS data importation
• Statistic compensations• Calibration• Signal processing
�Speckle filtering�Texture analysis & segmentation�BS model�Sand ripples analysis
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SonarScope : Multiple input/output data formats
Caraibes
SonarScope
ErMapper
CFloor
IRAP
Fledermaus(restricted)
Surfer
Kongsberg .all
Reson .s7k
GoogleEarth Nasa worldWind
GMT
WMS Servers
tif, jpg, bmp…
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SonarScope : GoogleEarthformat
© Ifremer
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SonarScope : NasaWorldWindformat
© Ifremer
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SonarScope : NasaWorldWindformat
© Ifremer
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SonarScope : Statistic compensation
© NIWA, NZ
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SonarScope : Speckle filtering
Swansea wreck.Klein 5500 sonar.
Courtesy of DGA/GESMA
Original Despeckled
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SonarScope : Speckle filtering
Swansea wreck.Klein 5500 sonar.
Courtesy of DGA/GESMA
Original Despeckled
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SonarScope : Speckle filtering
Original Sar Image © Ifremer
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SonarScope : Speckle filtering
Original Sar Image © Ifremer
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SonarScope : Segmentation
Segmentation variationnelleτ=6,9%
Segmentation manuelle(Axel Ehrhold Rebent project)
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SonarScope : Segmentation
Segmentation manuelle(Axel Ehrhold Rebent project)
Segmentation bayésienneTw = 7x7 τ=12,5%
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SonarScope : Segmentation
Segmentation manuelle(Axel Ehrhold Rebent project)
Segmentation bayésienneTw = 33x33 τ=13%
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SonarScope : Segmentation
Dépendance angulaire du niveau d’énergie
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SonarScope : Segmentation
Dépendance angulaire de la texture
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SonarScope : Segmentation
Segmentation sansdépendance angulaire
Segmentation avecdépendance angulaire
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SonarScope : Reson-SAT2
•Reson 7150 24 kHz bathymetry : a forest of artefacts
© Ifremer
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SonarScope : Reson-SAT2
•Reson 7150 24 kHz bathymetry after a preliminary spikeremover
© Ifremer
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• 2005-2006 : partnership agreements with�NIWA (New-Zealand)
�CHS (Canada)
�CIDCO (Canada)
�SHOM (France)
�ENST (France)
• 2007 : commercial product
SonarScope : External diffusion
