Composite map describing MDAC coverage at Croker Carbonate Slabs SAC
A composite Habitats Directive Annex I feature extent map of Submarine structures made by leaking gases for the Croker Carbonate Slabs cSAC/SCI was created by JNCC staff to provide the most up-to-date knowledge of MDAC coverage within the site.
Existing polygon data from three previous surveys (CEND1108, CEND0513 and CEND2315) and habitat maps were combined with groundtruthing point information, to build a composite understanding of ÔÇ£HighÔÇØ and ÔÇ£PotentialÔÇØ Annex I feature within the site.
Simple
- Alternate title
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GB001552
- Date (Creation)
- 2018-02-01
- Date (Publication)
- 2018-04-25
- Citation identifier
- EMODnetSeabedHabitats / GB001552
- Point of contact
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Organisation name Individual name Electronic mail address Role JNCC
habitatmapping@jncc.gov habitatmapping@jncc.gov.uk
Owner
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GEMET - INSPIRE themes, version 1.0
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Habitats and biotopes
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http://inspire.ec.europa.eu/codelist/ReferenceHabitatTypeSchemeValue
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Habitats directive
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- Use limitation
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┬® JNCC. Data may be re-used under the terms of the Open Government Licence v3.
- Use limitation
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geossAttribution
- Access constraints
- Other restrictions
- Other constraints
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no limitation
- Spatial representation type
- Vector
- Denominator
- 10000
- Language
- English
- Topic category
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- Environment
- Oceans
- Begin date
- 2008-01-01
- End date
- 2015-12-31
- Supplemental Information
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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
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EPSG
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WGS 84 (EPSG:4326)
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7.9
- Topology level
- Geometry only
- Distribution format
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Name Version ESRI Shapefile
1.0
- OnLine resource
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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¢er=-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
Conformance result
- Date (Publication)
- 2009-12-15
- Explanation
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See the referenced specification
- Pass
- Yes
Conformance result
- Date (Publication)
- 2010-12-08
- Explanation
-
See the referenced specification
- Pass
- Yes
- Statement
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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
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ISO19115
- Metadata standard version
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2003/Cor.1:2006
- Metadata author
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Organisation name Individual name Electronic mail address Role JNCC
HabitatMapping@jncc.gov HabitatMapping@jncc.gov.uk
Point of contact