1 Malcolm Thomson Malcolm Thomson International Centre for Island Technology Heriot Watt University(Orkney Campus) Old Academy Stromness Orkney Scotland, UK SUMARE Workshop: Underwater Robotics for Ocean Modelling and Monitoring Classification of maerl beds Classification of maerl beds using video images using video images
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1 Malcolm Thomson International Centre for Island Technology Heriot Watt University(Orkney Campus) Old Academy Stromness Orkney Scotland, UK SUMARE Workshop:
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Malcolm Malcolm ThomsonThomson
International Centre for Island TechnologyHeriot Watt University(Orkney Campus)
Old AcademyStromness
OrkneyScotland, UK
SUMARE Workshop: Underwater Robotics for Ocean Modelling and Monitoring
Classification of maerl beds Classification of maerl beds using video imagesusing video images
Classification of maerl beds Classification of maerl beds using video imagesusing video images
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Use of video in marine habitat mapping
Data outputs & problems
Influence of altitude on classification
Recognition of different maerl features
SUMARE and the maerl case study
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Video in marine habitat mappingVideo in marine habitat mapping
• Widely used by divers and in ROVs for seabed survey
• Human interpretation required• Simple data processing, e.g. animal
counting• Used to “ground truth” acoustic survey
results, e.g. Sound of Arisaig SAC
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““Unsupervised” video processingUnsupervised” video processing
• Used by Lebart et al. (2000) to detect features in sea floor video transects– looking for discrete features
• Seabed habitat mapping is a priority in marine research e.g. ICES, OSPAR, Habitats Directive– “unsupervised” classification tools have
• Recap:-– Marine alga– Non-jointed calcareous structure– Can form large deposits on the seabed– Found in or near strong water currents– Is exploited commercially in France, the UK
and Ireland
– Very high species diversity - high conservation value
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~10 cm
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~2m
Maerl mosaic from Wyre Sound, Orkney Islands
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Information requirements for Information requirements for maerlmaerl
• Dimensions of maerl beds• Variation in area coverage of maerl
– variation in amount of living maerl may indicate the health status
• SUMARE - use autonomous sensors to:– provide information on the boundaries of
maerl beds– estimate the coverage of living (and dead)