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Abstract

A single beam acoustic ground discrimination system (AGDS) was used to survey 1.25 km2 of shallow (< 20 m depth) seabed on the northeast coast of Tasmania, Australia. This paper investigates the uncertainties associated with the qualitative interpretation of real time and post-processed acoustic signal, and the effect of track spacing on the mapping of rocky reef distribution. The survey was repeated with different track spacing (50 m, 100 m, 200 m and 50 200 m shore normal) to investigate the influence of data density and 'knowledge based interpolation' validated against direct measurements made with an underwater video camera. Habitat area calculations varied substantially only with the 50 200 m transect. These results have important implications for the qualitative assessment and application of AGDS technology in shallow water marine habitat mapping.

Item Type:	Article
Authors/Creators:	Lucieer, VL and Bruce, E
Keywords:	Seabed habitat mapping; Acoustic classification; AGDS; Accuracy assessment
Journal or Publication Title:	The International Journal of Environmental Studies
Publisher:	Routledge Taylor & Francis Group
ISSN:	0020-7233
DOI / ID Number:	10.1080/00207230601157419
Additional Information:	The definitive version is available online at http://www.informaworld.com/smpp/content?
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