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.
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Alternate title | GB001552 |
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Date | 2018-02-01 |
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 | GB001552 |
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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 | 10000 |
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Language | English |
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Topic category code |
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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 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 | 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. |
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Distribution format | ESRI Shapefile (Version: 1.0) | ||||||||||||||||||||||||||||||||||||||||||||||||
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File identifier | 4ef9b811-6465-4342-bf43-8ecc60f010a3 | ||||||
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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 | 2020-01-15T12:09:19 | ||||||
Metadata standard name | ISO19115 | ||||||
Metadata standard version | 2003/Cor.1:2006 | ||||||
Contact
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Overviews
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Associated resources
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