Autosub AUV and Isis ROV:

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Autosub AUV and Isis ROV A Question of Scale
Comparison of Swath-Bathymetric Datasets
Julian Dowdeswell, Riko Noormets, Jeff Evans and
many colleagues on JR106b and JR157
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Swath bathymetric equipment considerations

• Frequency and beam configuration
• Water depth - beam spreading
• Vehicle speed - density of data points
• Processing - gridding resolution
• Scale of scientific problem also important

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JR106b, 2004, East Greenland Autosub AUV Swath
EM2000
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Isis ROV JR157 Antarctic Peninsula 2007 Swath
Ms2000
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RRS James Clark Ross Arctic and Antarctic
geophysical cruises Swath EM120
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JR106b mouth of Kangerdlussuaq Fjord, East
Greenland
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Autosub swath bathymetry 1 m grid cell size
Ship swath bathymetry 25 m grid cell size (best
resolution)
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Autosub swath shaded relief image 1 m grid cell
size
Resolution of features in AutoSub swath imagery
not replicated in ship swath records
Ship swath shaded relief image 25 m grid cell
size (best resolution possible)
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JR106b Courtauld Fjord, East Greenland
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Autosub swath bathymetry 5 m grid cell size
Ship swath bathymetry 5 m grid cell size
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Autosub swath shaded relief image 1 m grid cell
size (representative of images produced with up
to 5 m grid cell sizes)
Ship swath shaded relief image 5 m grid cell
size (finest resolution)
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Cruise JR157 Jan-Feb 2007 Antarctic Peninsula
Margin Ship track and EM120 swath coverage
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JR157 Blind Bay, Bougeois Fiord, Antarctic
Peninsula
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5143
4848
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Greenland Basin swath bathymetry
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Subglacial bedform evolution in a surge-type
glacier
Borebukta, Isfjorden (Ottesen and Dowdeswell)
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Former subglacial channel network investigated
using the Isis ROV, Marguerite Bay, Antarctic
Peninsula
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