© 2005 International Council for the Exploration of the Sea
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
a Scottish Association for Marine Science, Dunstaffnage Marine Laboratory Oban, Argyll PA37 1QA, Scotland, UK
b Aquatic Systems Group, Agriculture, Food and Environmental Sciences Division, Queen's University Belfast Newforge Lane, BT9 5PX, Northern Ireland, UK
c Centre for Environment, Fisheries and Aquaculture Science, Burnham Laboratory Remembrance Avenue, Burnham-on-Crouch, Essex CM0 8HA, England, UK
d FRS Marine Laboratory PO Box 101, 375 Victoria Road, Aberdeen AB11 9DB, Scotland, UK
e Department of Agricultural and Rural Development Newforge Lane, BT9 5PX, Northern Ireland, UK
f Joint Nature Conservation Committee Monkstone House, City Road, Peterborough PE1 1JY, England, UK
*Correspondence to: C. J. Brown, Centre for Coastal and Marine Research, School of Environmental Sciences, University of Ulster, Coleraine campus, Cromore Road, Coleraine, Co. Londonderry, BT52 1SA, Northern Ireland, UK; tel: +44 2870 32337; fax: +44 28070324911. e-mail: c.brown2{at}ulster.ac.uk.
In September 2003 a national workshop took place in the United Kingdom with the aim of assessing the accuracy of the acoustic ground-discrimination system (AGDS), RoxAnnTM, as a tool for mapping seabed habitats in Special Areas of Conservation (SACs). A heterogeneous area of seabed, approximately 1 km2 in size, was selected for the study. The area was first surveyed using a sidescan-sonar system and a mosaic of the output was produced covering 100% of the survey area. Interpretation of the mosaic identified three acoustically distinct seabed types, the spatial distributions of which were mapped. Four RoxAnn data sets were then collected over the same area of seabed applying different survey parameters (e.g. different survey grids, track spacing, survey vessels, survey speeds, and RoxAnn systems). Extensive ground-truthing was carried out involving 26 drop-down video stations, and from these data six benthic classes (seabed habitats) were identified. Following interpolation of the RoxAnn track-point data to produce full spatial-coverage data, these six-seabed habitat categories were used to conduct supervised classification of the RoxAnn data to produce full-coverage habitat maps of the area for each of the four RoxAnn data sets. Comparisons were then made between the four RoxAnn maps and the sidescan-sonar interpreted map. The accuracy of each map was assessed and the application of this mapping approach for mapping seabed habitats in SACs is discussed.
Keywords: acoustic ground-discrimination systems, mapping, RoxAnn, seabed habitat, sidescan sonar
Received 30 May 2004; accepted 2 October 2004.
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  C. Yeung and R. A. McConnaughey Using acoustic backscatter from a sidescan sonar to explain fish and invertebrate distributions: a case study in Bristol Bay, Alaska ICES J. Mar. Sci., March 1, 2008; 65(2): 242 - 254. [Abstract] [Full Text] [PDF]
|
|