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  • This dataset is a BGS interpretation (Sally Philpott) of 100% side scan cover from the survey area. The interpretation also referred to BGS historical sediment data for the area, and point ground-truth samples. This was a site specific survey around the Hastings shingle bank 12x4km in the Eastern Channel. The map was ground-truthed using video tows to assess the distinctness of the boundaries, thus giving a high confidence in the boundaries drawn. This is only sediment data, no biotope assignments have been made to these polygons. Faunal samples from Hammon Grabs and 2m beam trawls exist, but have not been used to interpret biotopes. This work is part of project AE1033 (internal CEFAS code) to be reported in CEFAS Science Series Technical Report, Summer 2005. The polygons follow the BGS sediment/bedform classification.

  • Broadscale interpretation of seabed facies between Hastings and Dungeness (Varne) in Eastern Channel. Survey was 50km (E) x 15km (N). Individual side scan tracks interpreted into seabed sediments, then interpolated across whole survey area by Sally Philpott (BGS Keyworth). This data set relates to side scan tracks at 1 km track spacing, 400 m swathe width. The data has limited ground-truthing, and biotopes have not been assigned. Faunal samples from Hammon Grabs and 2m beam trawls exist, but have not been used to interpret biotopes. PSA data in half phi units now converted to folk. The area contains the smaller, more detailed map of Hastings shingle bank, in Facies map of Hastings (GB000455). This work is part of project AE1033 (internal CEFAS code) to be reported in CEFAS Science Series Technical Report, Summer 2005. The polygons follow the BGS sediment/bedform classification.

  • Broadscale EUNIS habitat map covering ~3,800 sq km lying >12 km off the Isle of Wight, to the UK/France median line. Aimed at identifying Annex I 'Rocky reef' habitats. Based on expert interpretation of multiple data sets including Benthic Terrain Modeller applied to full-coverage single-beam digital bathymetry (licensed from SeaZone), complementary Cefas acoustic surveys with directed ground truth sampling (video and still images), and the BGS seabed sediments chart modified according to the simplified 4-class Folk trigion used by MESH and EUNIS (Coarse, Mixed, Sand, Mud).

  • Seabed facies interpretation (Sally Philpott, BGS) of area 12km x 4km east of the Isle of Wight, adjacent to Nab Tower, based on 100% side scan cover obtained in August 1998. The interpretation also referred to BGS historical sediment data for the area, and point ground-truth samples.

  • Finescale EUNIS habitat map covering ~50 sq km lying SSW of the Isle of Wight, half way between the UK 12 NM line and the UK/France median line. Aimed at provifiding fine, nested detail within a broader study identifying Annex I 'Rocky reef' habitats. Based on expert interpretation of 100% multibeam coverage supported by directed ground truth sampling (video and still images), Benthic Terrain Modeller and QTC View analysis applied to single-beam digital bathymetry (licensed from SeaZone), and the BGS seabed sediments chart modified according to the simplified 4-class Folk trigion used by MESH and EUNIS (Coarse, Mixed, Sand, Mud).

  • Temporal survey around dredged material disposal site 'TY070' (approx 8 x 4 km) off North Tyne, to assess utility of techniques for seabed mapping and monitoring. Pilot survey in 2001 using sidescan, AGDS, drop camera, grabs and trawls. 100% sidescan mosaics in 2002, 2003, 2004. Multibeam surveys in 2003, 2004. AGDS surveys in 2003, 2003. Outputs from each years acoustic surveys were used to delineate 'acoustically distinct areas' which were then ground-truthed using grabs, trawls & video (& sediment profile imagery in 2003). AGDS data (RoxAnn & QTC) subject to supervised & unsupervised classification for conparison across years [Supervised classification for QTC only, for 2001, 2002 & 2003. Supervision based on sediment type (Folk classification), faunal classes, and sediment/bedform types identified from sidescan mosaic]. Polygonised map submitted is for the 2004 survey, showing seabed character (substrate & bedform) interpreted from sidescan mosaics. Habitat/biotope classification not attempted.

  • Broadscale EUNIS habitat map covering ~3,400 sq km lying >12 km off Portland/Lyme Bay, to the UK/France median line. Aimed at searching for Annex I 'Rocky reef' habitats. Based on expert interpretation of multiple data sets including using Benthic Terrain Modeller applied to full-coverage single-beam digital bathymetry (licensed from SeaZone), complementary Cefas acoustic surveys with directed ground truth sampling (video and still images), and the BGS seabed sediments chart modified according to the simplified 4-class Folk trigion used by MESH and EUNIS (Coarse, Mixed, Sand, Mud).

  • Temporal survey around aggregate extraction site off Shoreham (approx 4 x 2 km), to assess utility of techniques for seabed mapping and monitoring. 100% side scan mosaics in 2001, 2002, 2003, 2004 used to delineate acoustically distinct areas that were then ground-truthed using grabs and video. Additional ground-truth sampling by trawls in 2003 & 2004. AGDS (QTC) surveys in 2002 & 2003. Multibeam surveys in 2003, 2004. Polygonised maps available for 2001 to 2004. This submission for 2004, showing seabed character (substrate & bedform) interpreted from side scan mosaics. QTC data subjected to supervised & unsupervised classification for comparison across years. Supervised classification based on sediment type (Folk classification), faunal classes, and sediment/bedform types identified from side scan mosaic. Habitat/biotope classification not attempted.

  • Exploratory survey around spoil disposal site due west of Swanage Bay, in anticipation of increased usage. Area approx 7.5 x 3.5 km. Multibeam survey in 5 corridors, each ~400m wide. Ground truthing at 6 stations by video (drop-camera). Survey area polygonised into 7 acoustically distinct areas, based on interpretation of multibeam backscatter and bathymetry. Habitat/biotope classification not attempted.

  • Exploratory survey of site 10 km SSE of Looe, Cornwall. Approx area 5 x 3 km. 100% side scan mosaic, delineated into 5 acoustically distinct areas. The 2 most dissimilar areas were ground-truthed with grabs, trawls and video. Habitat/biotope classification not attempted.