Alternate title

GB001530

Date (Publication)

2018-04-28

Date (Revision)

2015-01-15

Date (Creation)

2015-01-15

Citation identifier

EMODnetSeabedHabitats / GB001530

Point of contact

Organisation name	Individual name	Electronic mail address	Role
Defra		open@defra.gsi.gov.uk	Owner
JNCC		habitatmapping@jncc.gov.uk	Custodian

GEMET - INSPIRE themes, version 1.0

• Habitats and biotopes

http://inspire.ec.europa.eu/codelist/ReferenceHabitatTypeSchemeValue

• Eunis

Use limitation

┬® Defra. Data may be re-used under the terms of the Open Government Licence v3.

Use limitation

geossAttribution

Access constraints

Other restrictions

Other constraints

no limitation

Spatial representation type

Vector

Denominator

6000

Language

English

Topic category

• Biota
• Oceans

Begin date

2007-01-01

End date

2014-12-31

Supplemental Information

Barrio-Frojan, C., Brown, L., Downie, A. (2015) Slieve na Griddle rMCZ Post-survey Site Report. Defra contract reference: MB0120, report number: 37, version 3. Accessed via http://randd.defra.gov.uk/Document.aspx?Document=14043_SlievenaGriddlerMCZ_SummarySiteReport_V3.pdf [2017-12-11]

Reference system identifier

EPSG / WGS 84 (EPSG:4326) / 7.9

Topology level

Geometry only

Distribution format

Name	Version
ESRI Shapefile	1.0

OnLine resource

Protocol	Linkage	Name
WWW:LINK-1.0-http--link	http://randd.defra.gov.uk/Document.aspx?Document=14043_SlievenaGriddlerMCZ_SummarySiteReport_V3.pdf	Slieve na Griddle MCZ Post-survey Site Report
OGC:WMS	https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_view_maplibrary/wms?	gb001530
OGC:WFS	https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_open_maplibrary/wfs?	gb001530
WWW:LINK-1.0-http--link	https://files.emodnet-seabedhabitats.eu/data/EMODnetSBHsurvey_GB001530.zip	EMODnet Seabed Habitats download

Hierarchy level

Dataset

Statement

Acoustic datasets from two surveys were used to aid the mapping of the seabed within the Slieve na Griddle rMCZ. The first survey, conducted in 2007, was by AFBI, and targeted the Pisces Reef SAC region as part of the Mapping European Seabed Habitats (MESH) programme. It acquired multibeam data using a Kongsberg Simrad EM1002-S multibeam echosounder (MBES). The second survey was undertaken in 2012 aboard the RV Corystes (cruise code: CO082012), again by AFBI, using a Kongsberg Simrad 300 kHz EM3002 MBES.

All MBES data were collected and processed in accordance with the International Hydrographic Organisation (IHO) Standards for Hydrographic Surveys - Order 1. Both bathymetry and backscatter datasets were gridded at 3 m resolution for analysis (see Appendix 2 for images derived from acoustic data).

Existing data from groundtruthing surveys conducted by AFBI in 2012 and for the 2004 Strategic Environmental Assessment of the Irish Sea (SEA 6; Judd, 2004) were included in the habitat mapping process reported here. These data consisted of photographic stills of the seabed.

Existing data were supplemented with further ground truth sampling by a dedicated survey of the site aboard the RV Cefas Endeavour in July 2014 (cruise code CEND1414). Newly acquired ground truth samples consisted of video footage and still photographs of the seabed. No sediment or faunal grab data were collected.

Eight underwater camera tows were undertaken during cruise CEND1414, targeting specific features of interest within the rMCZ, namely, low energy circalittoral rock outcrops thought to occur in isolated patches within the surrounding subtidal mud habitat. Video transects were made using a drop-down camera platform. Set-up and operation followed the MESH Recommended Operating Guidelines for underwater video and photographic imaging techniques.

Aboard RV Cefas Endeavour, the drop-camera platform was lowered to the seabed from the side gantry whilst maintaining a speed of c. 0.5 knots. Each sampling transect lasted approximately 30 minutes. The camera and lighting system was supplemented by a four-point laser scaling device to provide a reference scale in the recorded images. A video overlay was used to provide station metadata, time and GPS position (of the vessel) in the recorded video image. Video was recorded simultaneously to a DV tape and a computer hard drive. Still photographs were captured at regular one minute intervals and opportunistically if specific features of interest were encountered. Back onshore, video and still images were analysed following an established protocol developed and used by Cefas.

The new broadscale habitat map was produced by analysing and interpreting the available acoustic and ground truth data collected during all surveys of Slieve na Griddle rMCZ. Acoustic data were converted to raster images for ease of interpretation. The data integration and mapping process involved object-based image analysis (OBIA) implemented in the software package eCognition v9.0.2.

Metadata

File identifier

e7395081-6968-4edc-8205-a5b2ffbd052e XML

Metadata language

English

Character set

MD_CharacterSetCode_utf8

Hierarchy level

Dataset

Date stamp

2021-10-06T10:46:36

Metadata standard name

ISO19115

Metadata standard version

2003/Cor.1:2006

Metadata author

Organisation name	Individual name	Electronic mail address	Role
JNCC		HabitatMapping@jncc.gov.uk	Point of contact