2b0e56c8-f969-48e4-8109-7ecc57575804 JNCC HabitatMapping@jncc.gov.uk 2026-03-11T09:54:58.703234Z ISO19115 2003/Cor.1:2006 WGS 84 (EPSG:4326) EPSG 7.9 Broadscale habitat (EUNIS level 3) for South of Portland (rMCZ) GB001546 2018-04-30 2018-04-30 2018-04-30 GB001546 EMODnetSeabedHabitats Updated habitat map resulting from an intergrated analysis of the acoustic and ground truth survey data in 2014 (onboard the RV Cefas Endeavour). Broadscale habitats at each ground truth station were used to inform a semi-automated mapping process using object-based image analysis (OBIA). The majority of the seabed was classified as the BSH 'A4.1 High energy circalittoral rock/A4.2 Moderate energy circalittoral rock', with a with a large sediment bank in the north of the rMCZ made up of the BSHs 'A5.1 Subtidal coarse sediment' and 'A5.2 Subtidal sand'. Defra open@defra.gsi.gov.uk Natural England enquiries@naturalengland.org.uk Habitats and biotopes GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Eunis http://inspire.ec.europa.eu/codelist/ReferenceHabitatTypeSchemeValue 2018-04-30 Available under the Open Government License v3.0 geossAttribution Contact the Cefas Data Manager (datamanager@cefas.co.uk) for more information. 5000 biota oceans -2.541575 -2.456124 50.462479 50.516668 Esri Shapefile 1.0 https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_view_maplibrary/wms? OGC:WMS gb001546 View map "GB001546" through the EMODnet Seabed Habitats "Map Library" Web Map Service https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_open_maplibrary/wfs? OGC:WFS gb001546 Access data from map "GB001546" through the EMODnet Seabed Habitats "Map Library" Web Feature Service https://files.emodnet-seabedhabitats.eu/data/EMODnetSBHsurvey_GB001546.zip WWW:LINK-1.0-http--link EMODnet Seabed Habitats download Corrigendum to INSPIRE Metadata Regulation published in the Official Journal of the European Union, L 328, page 83 2009-12-15 See the referenced specification true Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 See the referenced specification true Multibeam echosounder (MBES) data were collected under the Civil Hydrography Programme (CHP) in the area around this rMCZ for the purpose of updating navigation charts. The bathymetric component of these data has been used in the creation of the Defra Digital Elevation Model (DEM; Astrium, 2011). Existing MBES bathymetry data from the UK's CHP were provided to Cefas as fully processed and cleaned bathymetry data, as well as raw data files for further backscatter processing by Cefas. The bathymetry data were collected and processed in accordance with the International Hydrographic Organisation (IHO) Standards for Hydrographic Surveys - Order 1 (Special Publication 44, Edition 4). Processing of the backscatter data was undertaken by Cefas using the raw data provided. The software package QPS FM Geocoder Toolkit (FMGT) was used to produce fully compensated and corrected backscatter mosaics and these were exported as Floating Point Geotiff files for further analysis. Ground truth samples were collected on board RV Cefas Endeavour in June 2014 (Cruise code: CEND0614; Callaway and Mason, 2014). Sampling stations were positioned within the rMCZ using a triangular lattice grid overlaid on the CHP map. The exact location of each sampling station was adjusted to coincide with notable bathymetric features. An underwater camera system was deployed at stations to collect video and still images of the seabed. A benthic grab was deployed to collect sediments and infauna samples at a subset of stations, where either the backscatter data indicated the presence of sediment, or the footage from the underwater video camera suggested a grab sample would be successful (Figure 2; Appendix 1). Underwater imagery was acquired using a frame mounted drop camera towed at c 0.5 knots (c. 0.25 m s -1 ) across a 50 m ÔÇÿbullringÔÇÖ centred on the sampling location. A minimum tow duration of two minutes was carried out per deployment. Drop camera tows at stations which were not successfully sampled by the grab were extended to a minimum of 10 minutes. Extended duration tows were also conducted at approximately one third of ground truth sampling sites located to coincide with each of the acoustically distinct facies observed in the bathymetry and backscatter data. During each tow, still images were captured at regular one minute intervals and opportunistically if specific features of interest were encountered A four-point laser scaling device was used to provide a reference scale in the video and still images and imagery was geo referenced using a High Precision Acoustic Positioning system. Set-up and operation followed the MESH ÔÇÿRecommended Operating Guidelines (ROG) for underwater video and photographic imaging techniquesÔÇÖ (Coggan et al., 2007). Video was recorded simultaneously to a Sony GV-HD700 DV tape and a computer hard drive. A video overlay was used to provide station metadata, time and GPS position (of the vessel) in the recorded video image. Video and still images were analysed following an established protocol developed and used by Cefas (Coggan and Howell, 2005; JNCC, in prep.; see Annex 5). Grab sampling equipment comprised a mini Hamon grab (sampling area: 0.1 m2 ). On recovery, the contents of the grab were emptied into a large plastic bin and a representative sub-sample of sediment (approx. 0.5 litres) was taken for subsequent Particle Size Analysis (PSA). The remaining sample was photographed and sieved over a 1 mm mesh sieve to collect the benthic fauna. Fauna were preserved in 4% buffered formaldehyde for later processing ashore. For further detail on ground truth South of Portland rMCZ Post-survey Site Report 9 sample collection see the ÔÇÿSouth of Portland rMCZ Survey ReportÔÇÖ (Callaway and Mason, 2014).