Alternate title

GB001552

Date (Creation)

2018-02-01

Date (Publication)

2018-04-25

Citation identifier

EMODnetSeabedHabitats / GB001552

Point of contact

Organisation name	Individual name	Electronic mail address	Role
JNCC		habitatmapping@jncc.gov.uk	Owner

GEMET - INSPIRE themes, version 1.0

• Habitats and biotopes

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

• Habitats directive

Use limitation

┬® JNCC. 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

10000

Language

English

Topic category

• Environment
• Oceans

Begin date

2008-01-01

End date

2015-12-31

Supplemental Information

Duncan, G. 2018. Method for creating a composite map of Annex I Submarine structures made by leaking gases for Croker Carbonate Slabs cSAC/SCI. JNCC Report No. 611. JNCC, Peterborough. ISSN 0963-8091. [Available from: http://jncc.defra.gov.uk/page-7553]

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://jncc.defra.gov.uk/page-7553	Method for creating a composite map of Annex I Submarine structures made by leaking gases for Croker Carbonate Slabs cSAC/SCI
WWW:LINK-1.0-http--link	https://www.emodnet-seabedhabitats.eu/access-data/launch-map-viewer/?zoom=18&center=-0.00005,0.00048&layerIds=510&baseLayerId=1&activeFilters=NobwRANghgngpgJwJIBMwC4CsBGADAGjADMBLCAF0VQ0wCZDSLEAZAe1YGsBXAB1QGcMwALoMylBABU4AD3IYwAcQBCuXNkx0wAX2FA	EMODnet Seabed Habitats Map Viewer
OGC:WMS	https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_view_maplibrary/wms?	gb001552
OGC:WFS	https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_open_maplibrary/wfs?	gb001552
WWW:LINK-1.0-http--link	https://files.emodnet-seabedhabitats.eu/data/EMODnetSBHsurvey_GB001552.zip	EMODnet Seabed Habitats download

Hierarchy level

Dataset

Statement

CEND1108 data derived from sidescan sonar and imagery, with manual delineation of MDAC into high and low relief.

CEND0513 data derived from multibeam echo sounder, grab samples and imagery. Dataset describes "Hard substrate" in the site, using Object Based Image Analysis (OBIA) and Random Forest classification.

CEND2315 data derived from multibeam echo sounder, grab samples and imagery. Dataset describes likely presence of MDAC using OBIA and Random Forest classification. Due to the presence-only method used in the creation of the dataset, areas where the analysis did not result in an MDAC prediction, should not be taken as evidence of a lack of MDAC. A qualitative confidence assessment was undertaken alongside the creation of the dataset, with polygons classes as increasing confidence from 0 to 4.

The three maps were used as input datasets in ArcGIS's Union tool, to produce an intersection of all possible combinations of classes. The output was then attributed confidence values based on agreement between the datasets.

Grab samples from CEND2315 that were tested for MDAC presence using isotope analysis were used to identify possible ÔÇ£high confidenceÔÇØ areas that were not attributed as such in the output of the intersection method (section 2.2). The output of the intersection step was dissolved, retaining single part features, to produce an overview of contiguous areas. Point records of confirmed MDAC were then used to select underlying areas of the polygon output with additional evidence of MDAC presence by location. Polygons with an area of over 0.1km2 (Projection ÔÇô EPSG:3035) were deselected to avoid overextrapolation from the point data. Polygons within the three remaining selected areas were attributed as ÔÇ£HighÔÇØ final confidence, and information regarding this manual further step was included in the ÔÇ£VAL_COMMÔÇØ (validation comments) field within the dataset.

Metadata

File identifier

4ef9b811-6465-4342-bf43-8ecc60f010a3 XML

Metadata language

English

Character set

MD_CharacterSetCode_utf8

Hierarchy level

Dataset

Date stamp

2020-01-15T12:09:19

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