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ICES Journal of Marine Science: Journal du Conseil 2003 60(6):1288-1297; doi:10.1016/S1054-3139(03)00134-6
© 2003 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Effect of track spacing and data interpolation on the interpretation of benthic community distributions derived from RoxAnnTM acoustic surveys

Eunice H Pinna,* and M.R Robertsonb

a School of Conservation Sciences, Bournemouth University, Fern Barrow Poole, Dorset BH12 5BB, UK
b FRS Marine Laboratory PO Box 101, Victoria Road, Aberdeen AB11 9DB, UK

*Correspondence to E. H. Pinn; tel: +44 1202 595178; fax: +44 1202 595255. e-mail: epinn{at}bournemouth.ac.uk.

A 150 mile2 (388 km2) area in the South Minch on the Scottish west coast was surveyed acoustically using the seabed discrimination system RoxAnnTM. This site was chosen from BGS seabed sediment maps because of the wide variety of substratum types present within a relatively small area. The work presented here investigates different combinations of survey track spacing in relation to interpolation of acoustic data for mapping benthic biodiversity. Three different survey track spacings (4, 2 and 1 km) and three pixel sizes (1000, 500 and 250 m) were utilised. The results indicated considerable variations in the fine scale variations of the substratum maps produced and their accuracy in relation to ground truth data. Depending on the track spacing and level of interpolation utilised, the survey site could be considered relatively important under the UK Biodiversity Action Plan in terms of priority habitat types present or completely insignificant. These variations have serious implications for the use of this technology in site identification, conservation and management.

Keywords: data interpolation, geographical information system, habitat type, image analysis, macrofauna, RoxAnnTM

Received 6 August 2002; accepted 28 June 2003.


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C. J. Brown, A. Mitchell, D. S. Limpenny, M. R. Robertson, M. Service, and N. Golding
Mapping seabed habitats in the Firth of Lorn off the west coast of Scotland: evaluation and comparison of habitat maps produced using the acoustic ground-discrimination system, RoxAnn, and sidescan sonar
ICES J. Mar. Sci., January 1, 2005; 62(4): 790 - 802.
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