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WORLD CLASS – through people, technology and dedication

Application of Phase Measuring Bathymetric Sonars to Nautical Charting and Mapping of Coastal Areas and Inland Waterways

Martin Gutowski – Product Sales Manager

Phase Measuring Bathymetric Sonar - System

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Data Products – Bathymetry and Side Scan

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Also called:Interferometric Multibeam

Bathymetric Side-ScanVernier Interferometer

Phase Measuring Bathymetric Sonar -Technology

Vernier Interferometer Wide Swath Sonar

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Phase Measuring

e

ab

cd

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Technology Advantages

• Wide swath width• 240 deg field of view• Up to 12 times water depth coverage• Increased productivityIncreased productivity

• True Side Scan data• Co-registered• Geo-referenced

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Looking at the Raw Data

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Data Processing

• Outlier filtering▼

• Binning

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Outlier filtering

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Raw Data

1m Grid

Binning

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Bin size ≈ sonar footprint ≈ min. feature size. Data density > (or >>) 10 per bin.

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Standard deviation comparison

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Sounding density comparison

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Error budget

Depth error budget for GeoSwath Plus in 10m water depth using Seatex Seapath 330+ (95% confidence level)

0.5

0.2

0.3

0.4

Dep

th e

rror

(m

at 9

5%)

Sounder (95%) Heave (95%) Roll (95%)

Pitch (95%) Refraction (95%) Total depth measurement (95%)

Dynamic draft (95%) Water level (95%) Total reduced depth (95%)

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0.0

0.1

0 10 20 30 40 50 60 70 80 90 100

Cross-track distance (m)

Algorithm courtesy of Larry Mayer, CCOM University of New Hampshire

Real data – bathymetry and standard deviation

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60 m1 m x 1m

grid

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Real data – population and standard error

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1 m x 1m grid

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Installations

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GeoSwath Plus frequency options

Frequency: 125kHz 250kHz 500kHz

Txd dims: 60x25x8cm 30x15x6cm 15x10x4cm

Max depth: 200m 100m 50m

Usual use: 0m – 200m capability

0m – 100m capability

0m – 50m capability

Found on: Larger Survey Ship

Small Vessel AUV/ROV

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GeoSwath Plus Performance

• Bathymetry and true geo-referenced Side Scan• Coverage up to 12 times water depth• 240 deg field of view• up to 200 m depth performance• Along track resolution: up to 0.9 degrees• Across track resolution: up to 0.02 degrees• 5000+ data points/fan• Ultra high resolution• IHO SP 44, Special Order• Sediment classification

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• Turnkey System and interface to Hypack, Quinsy, …

GeoSwath Plus Compact

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• Compact splash protected deck unit • 24 V power supply, 40 W

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Small boat installation

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GeoSwath AUV

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GeoSwath ROV

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Data examplesPhase measuring bathymetric sonr

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Yarmouth Road approaches

Water depth: 7m

Swath width: 70m

Area: 1000x700m

Sand waves: 4 cm

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Bridge crossing

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Constant 40 m line spacing – 2 m water depth

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Data courtesy of University of Rhode Islands location between Fire Island and Long Island, NY

Rivers

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Freemont Canal Seattle

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Comparison with other bathymetry systems

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Shallow Survey Conference 2008

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Overall differences of the overlap areas

• GeoSwath – EM3002D: 20cm mean difference, 6cm SD

• GeoSwath – 7125: 29.48m mean difference, 7cm SD

• 7125 – EM3002D: 29.28m mean difference, 5.5cm SD

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GeoSwath 7125 EM3002D

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GeoSwath Plus on Gavia AUVA commercial deployment in the Caspian Sea

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Location of Aplis ice camp: 73° N, 146° W

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The Survey Area

The Environmental Protection Officer

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Launch Hole

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Mission data

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Mission dataMaps of the underside of the Arctic iceMaps of the underside of the Arctic ice(from M. Doble and P. Wadhams, University of Cambridge, UK)(from M. Doble and P. Wadhams, University of Cambridge, UK)

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Wreck of the 6500t tanker Shirvan

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Picture: © National Maritime Museum, Greenwich, London

Data courtesy of Teledyne Gavia

Wreck of the US Coast Guard Cutter Alexander Hamilton (WPG-34) : GS+/AUV survey 2010

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Data courtesy of Teledyne Gavia

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Pocasset MA

GeoSwath Data Flow from Remus 100

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Data San Diego sewage outfall surveyed with GS+ on Remus100, October 2010 Different visualisations aid interpretation

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Data from San Diego sewage outfall surveyed with GS+ on Remus 100, October 2010 True co-registered bathy and SS data

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Kongsberg Maritime

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