ANNEX I habitat for Bassurelle Sandbank Site of Community Importance (SCI)
An ArcGIS polygon shapefile of the potential extent of Annex I sandbank habitat identified at Bassurelle Sandbank SCI was created using the data collected and processed as described below.
EUNIS class assignments from the particle size data were used in conjunction with the interpreted still images to inform the semi-automated process of map production using object-based image analysis (OBIA), implemented in the software package eCognition v8.8.1. The OBIA was used to map habitats. It was not possible to use this technique for the mapping of Annex I habitats (specifically the sandbank feature at Bassurelle Sandbank SCI). Instead, an expert driven process of slope analysis in ArcGIS 9.3.1 and 3D visual interpretation using the Fledermaus v7 software package was used to identify the potential extent of the bank feature.
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Alternate title | GB001327 |
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Date | 2014-01-28 |
Date type | Creation: Date identifies when the resource was brought into existence |
Date | 2018-04-25 |
Date type | Publication: Date identifies when the resource was issued |
Unique resource identifier | GB001327 |
mdConstraintsSection
Resource constraints
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Point of contact
Organisation name | JNCC |
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Electronic mail address | habitatmapping@jncc.gov.uk |
Role | Owner: Party that owns the resource |
Descriptive keywords
GEMET - INSPIRE themes, version 1.0 | |
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http://inspire.ec.europa.eu/codelist/ReferenceHabitatTypeSchemeValue | Habitats directive |
GDI-Vlaanderen Trefwoorden | Metadata GDI-Vl-conform |
Spatial representation type | Vector: Vector data is used to represent geographic data |
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Spatial resolution
Denominator | 100000 |
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Language | English |
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Topic category code |
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Supplemental Information | Barrio Froján, C., Jenkins, C. & McIlwaine, P. 2017. CEND 03/13: Offshore seabed survey of Bassurelle Sandbank cSAC/SCI. JNCC/Cefas Partnership Report Series No. 15. JNCC, Peterborough. |
Reference System Information
Unique resource identifier | WGS 84 (EPSG:4326) |
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Codespace | EPSG |
Hierarchy level | Dataset: Information applies to the dataset |
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Lineage
Statement | 2.2.1 Sidescan sonar An Edgetech FS-4200 dual frequency (300/600 kHz) sidescan sonar was used in combination with the Edgetech Discovery software for data recording. Data were recorded in XTF format. The position of the sidescan was calculated using a layback calculation using the shipÔÇÖs position as reference. 2.2.2 Multibeam echosounder Multibeam bathymetry and backscatter data were acquired using the Kongsberg EM2040 system operated at 200 kHz and deployed on the drop keel of RV Cefas Endeavour. Variations of sound velocity with water depth were determined using a CTD (conductivity-temperature-depth) probe with a sound velocity profile (SVP) measurement taken at least once every 24h; SVP data acquired were applied during multibeam data acquisition. 2.3 Benthic sample and seabed imagery acquisition Ground-truthing stations were sampled using a HamCam (a mini Hamon grab fitted with an underwater video camera) and a towed sledge fitted with a digital underwater video camera capable of taking still photographs. A Jennings 2 m scientific beam trawl was also deployed at selected locations to collect qualitative information on the epifaunal assemblage. On recovery of the HamCam at each station, the sediment sample was decanted into a suitable container. The whole sample was photographed and the volume measured and recorded. A representative sub-sample of sediment (c. 0.5 litres) was taken for particle size analysis (PSA). The remaining sample was sieved over a 5 mm and 1 mm mesh sieve. Photographs were taken of the material retained on both sieves (see Whomersley, 2013). The retained fractions were combined in a suitable container before being fixed with buffered 4% formalin solution. The camera sledge system comprised of a video camera, laser-scaling device, underwater lights and a flash unit. During deployment, a note was made of the length of tow cable paid out to allow an estimate to be made of the distance of the sledge behind the vessel. USBL positioning was also used to log the position of the camera sledge on the seabed during each deployment. Video tows lasted c. 10 minutes, with a still photograph taken at approximately one minute intervals, or opportunistically if a feature of interest was observed. Where deployed, the Jennings 2 m beam trawl was towed at c. 1.5 knots for c. 5 minutes. On recovery, the catch was placed over a 5 mm mesh sieve and all retained taxa were identified, enumerated and weighed. |
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Domain consistency
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Domain consistency
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mdLegalAndSecurityConstraintsSection
Resource constraints
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Distribution format | ESRI Shapefile (Version: 1.0) | ||||||||||||||||||||||||||||
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Transfer options
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File identifier | 288a4373-c0f4-43b9-8a51-d6a7e2ba5c86 | ||||||
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Metadata language | English | ||||||
Character set | MD_CharacterSetCode_utf8: MD_CharacterSetCode_utf8 | ||||||
Hierarchy level | Dataset: Information applies to the dataset | ||||||
Date stamp | 2021-12-09T16:40:43 | ||||||
Metadata standard name | ISO19115 | ||||||
Metadata standard version | 2003/Cor.1:2006 | ||||||
Contact
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Overviews
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Associated resources
Not available