EMODnet Product Catalogue
Bembridge BSH
This feature details the findings of a dedicated seabed survey at the Bembridge recommended Marine Conservation Zone (rMCZ). The site is being considered for inclusion in a network of Marine Protected Areas (MPAs) in UK waters, designed to meet conservation objectives under the Marine and Coastal Access Act 2009.
Identificatie
| Alternatieve titel | GB001312 |
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| Versiedatum | 2018-04-26 |
| Type versiedatum | Publicatie: Uitgavedatum van de dataset. |
| Versiedatum | 2014-02-18 |
| Type versiedatum | Creatie: Aanmaakdatum of opnamedatum van de dataset. |
| Dataset identificator | GB001312 |
Inhoud
Inhoudelijke beperkingen
Beperkingen van de dataset(serie)
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Contactgegevens dataset(serie)
| Organisatie | DEFRA |
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| open@defra.gsi.gov.uk | |
| Rol | Eigenaar: Partij die eigenaar is van de data. |
Contactgegevens dataset(serie)
| Organisatie | Natural England |
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| enquiries@naturalengland.org.uk | |
| Rol | Beheerder: Partij die verantwoordelijkheid heeft geaccepteerd en zorg draagt voor het beheer van de data. |
Trefwoorden
| GEMET - INSPIRE themes, version 1.0 | Habitats and biotopes |
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| http://inspire.ec.europa.eu/codelist/ReferenceHabitatTypeSchemeValue | Eunis |
| GDI-Vlaanderen Trefwoorden | Metadata GDI-Vl-conform |
| Ruimtelijk schema dataset(serie) | vector: Vector data wordt gebruikt om geografische data te representeren. |
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Ruimtelijke resolutie dataset(serie)
| Noemer | 6000 |
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| Taal | Engels |
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| Categorie(ën) |
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Begrenzing
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Omschrijvende rechthoek
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| Identificator geografische begrenzing | |||||||||
Referentiesysteem
Horizontaal en/of verticaal referentiesysteem
| Unieke code | WGS 84 (EPSG:4326) |
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| Codespace | EPSG |
Kwaliteit
| Niveau kwaliteitsinformatie | Dataset: Informatie heeft betrekking op de dataset. |
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Bewerkingen
| Algemene beschrijving herkomst | Multibeam data utilised in this area were sourced from three separate surveys. The northern section of the site was surveyed by Titan Environmental Surveys in 2012 (Dusgate et al., 2012). The remainder of the site was covered by the Civil Hydrography Programme (CHP) and Channel Coastal Observatory (CCO) surveys, HI1315, HI1316 and HI1323. The bathymetric data were collected and processed in accordance with the International Hydrographic Organisation (IHO) Standards for Hydrographic Surveys - Order 1a (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, which were exported as Floating Point Geotiff files for further analysis. Both bathymetry and backscatter were gridded at 2m resolution for analysis (see Appendix 2 for images derived from acoustic data). Ground-truth samples for particle size analysis and infauna were collected from 29 stations which were positioned within the sedimentary habitats using a triangular lattice grid overlaid on the Site Assessment Document (SAD) habitat map. Benthic grabs were used to collect the sediments and infauna. An underwater camera system was deployed at 28 stations to collect video and still images of the seabed (Figure 2; Appendix 1). Broadscale Habitat (BSH) ground-truthing of the predicted coarser sediment areas of Bembridge rMCZ was carried out using a Mini Hamon Grab (MHM) deployed from the stern of the survey vessel. Ground-truthing of the predicted sandy areas was carried out using a 0.1 m 2 Day Grab (DG). Once recovered, the grab sample was decanted into a suitable container and photographed. If the sample volume was >5 litres a representative sub-sample of sediment, approx. 500 ml was taken for Particle Size Analysis (PSA) and the remaining volume measured and recorded. The sediment sample was then gently washed through a 1 mm sieve, photographed and the >1 mm infauna fraction transferred into a sample container. Buffered 8% formaldehyde solution was used to preserve the sample for transport to a specialist benthic fauna identification lab. If the sediment volume was <5 litres, the material was discarded, then three or more attempts were made to collect a suitable sample before relocating to the next station. Within the broadscale habitat areas identified in the SAD, a combination of grab and video sampling was carried out to provide the necessary ground-truthing data to inform interpretations carried out to produce the updated habitat map. The camera images and sediment samples helped to characterise the surficial sediments and associated faunal communities. The total number of camera and/or grab deployments for each BSH varied depending on the uniformity of the habitat and its spatial extent. The towed camera sledge was able to collect both video and still images. A 4-point laser scaling device was used to provide a reference scale in the video and stills images. Set-up and operation followed the MESH ÔÇÿRecommended Operating Bembridge rMCZ: Post-survey Site Report 10 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. All new maps and their derivatives have been based on a WGS84 datum. A new habitat map for the site was produced by analysing and interpreting the available acoustic data (as detailed above) and the ground-truthing data collected by the dedicated survey of this site. The process is a combination of two approaches, autoclassification (image analysis) and expert interpretation, as described below. The routine for auto-classification is flexible and dependent on site-specific data, allowing for application of a bespoke routine to maximise the acoustic data available. The technical quality of the updated habitat map was assessed using the MESH ÔÇÿConfidence AssessmentÔÇÖ Tool1 , originally developed by an international consortium of marine scientists working on the MESH (Mapping European Seabed Habitats) project. This tool considers the provenance of the data used to make a biotope/habitat map, including the techniques and technology used to characterise the physical and biological environment and the expertise of the people who had made the map. In its original implementation, it was used to make an auditable judgement of the confidence that could be placed in a range of existing, local biotope maps that had been developed using different techniques and data inputs, but were to be used in compiling a full coverage map for north-west Europe. Where two of the original maps overlapped, that with the highest MESH confidence score would take precedence in the compiled map. |
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Conformiteit
Domeinconsistentie
Resultaat
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Domeinconsistentie
Resultaat
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Toegangs- en gebruiksbeperkingen
Legale en veiligheidsbeperkingen
Beperkingen van de dataset(serie)
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Distributie
| Distributieformaat | ESRI Shapefile (Version: 1.0) | ||||||||||||||||||||||||||||||||||||
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Overdracht
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Meta-metadata
| Metadata identificator (fileIdentifier) | 235584a3-4592-4d56-8218-cc531f1eee4a | ||||||
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| Taal metadatarecord | Engels | ||||||
| Karakterset metadatarecord | MD_CharacterSetCode_utf8: MD_CharacterSetCode_utf8 | ||||||
| Hiërarchisch niveau | Dataset: Informatie heeft betrekking op de dataset. | ||||||
| Metadata wijzigingsdatum | 2020-01-15T12:23:16 | ||||||
| Naam metadatastandaard | ISO19115 | ||||||
| Versie metadatastandaard | 2003/Cor.1:2006 | ||||||
Metadata-auteur
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