Towed Video Surveys off the Coastline of the Llyn Peninsula North Wales (2013)
Surveys of the seabed were carried out using towed dropdown video surveys were taken aboard Lara B and William Stanley, both fishing vessels operating around Llyn Peninsula, Gwynedd, North Wales. A total of 38 video tows were collected from infralittoral and circalittoral habitats at the following five locations offshore from the Llyn Peninsular North Wales; Llyn-Hells Mouth, Ynys Gwlan, Porth Meudwy, North Llyn Modiolus and North Llyn sea Grass. Where available HD GoPro video footage was used in the analyses, however if this was not possible a lower quality standard definition footage was used. The locations of the video tows were made into GIS files as a spatial representation of the location of the tow surveys. Video surveys were conduct to conduct ground-truthing surveys through the seabed around the Llyn Peninsula, Gwynedd, North Wales.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS115838
- Alternative Title
-
- 2013 DRAFT Fisher Survey Towed Video Survey Llyn Peninsula, June. MRCCW31700000014
- Arolygon fideo llusgedig oddi ar lannau Llyn yng ngogledd Cymru, 2013.
- Metadata Language
- English
- Lineage
-
Drop-down video tows were carried out onboard small fishing boats using a High Definition (HD) GoPro video camera (approximate field of view is 100cm in the middle of the picture) and a Standard Definition ROVTECH Systems Micro Hi-Res Digital Colour Camera (1/3 inch Sony HAD CCD - 480 TV lines resolution) with 4.3mm wide angle lens (approx 80 degrees in water) and Mini Seabeam Lights. A manual log was kept of the location of the start and end of the transects, which were later digitized via GIS files. The video surveys were analysed for habitats, species and biotopes by Marine EcoSol using standard MNCR derived techniques and JNCC Marine Habitat Classifications. Drop-down video tows were carried out by Salacia Marine whilst onboard small fishing vessels.
- Dataset Reference Date (Publication)
- 2014-10-31
Temporal Extent
- Begin date
- 2013-06-17
- End date
- 2013-06-19
- Topic category
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- Biota
Extent
Extent
- Geographic Extent
- Irish Sea
- Geographic Extent
- Cardigan Bay
- Geographic Extent
- Tremadog Bay
))
Vertical Extent
- Medin Extent Keyword
- benthic boundary layer
Vertical Extent
- Minimum value (metres)
- -29
- Maximum value (metres)
- -2
- Vertical CRS
- urn:ogc:def:datum:EPSG::5100 Sea Level depth is unadjusted and does not take into account tidal height
Distribution
- Format Type and Description
-
-
Documents
()
- Specification
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[A] Excel spreadsheets [B] Marine Recorder Survey number: MRCCW31700000014.
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Documents
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
-
Drop-down video tows were carried out onboard small fishing boats using a High Definition (HD) GoPro video camera (approximate field of view is 100cm in the middle of the picture) and a Standard Definition ROVTECH Systems Micro Hi-Res Digital Colour Camera (1/3 inch Sony HAD CCD - 480 TV lines resolution) with 4.3mm wide angle lens (approx 80 degrees in water) and Mini Seabeam Lights. A manual log was kept of the location of the start and end of the transects, which were later digitized via GIS files. The video surveys were analysed for habitats, species and biotopes by Marine EcoSol using standard MNCR derived techniques and JNCC Marine Habitat Classifications. Drop-down video tows were carried out by Salacia Marine whilst onboard small fishing vessels.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
Keywords
- SeaDataNet Parameter Discovery Vocabulary
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- Seabed photography
- Habitat characterisation
- Type
- Theme
Citation
- Date (Revision)
- 2021-01-06
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
-
Part of this dataset is sensitive and restricted. Sensitive data must be kept confidential; general release is not permitted due to risk of harm to the environment or third parties. Sensitive data may only be released under an appropriate NRW Licence. Requests should be referred to NRW's Access to Information Team. Data may be released freely if the sensitive records are removed in advance, or shown only at a coarser scale.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© CNC/NRW Recipients may only re-use sensitive data in strict confidence under the terms of an appropriate NRW Licence. No publication or dissemination is permitted, except if sensitive records are removed in advance, or shown only at a coarser scale.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313135383338 XML
- Metadata Language
- English
- Parent Identifier
-
Natural Resources Wales (NRW) Marine Benthic Species and Habitat Collation Held in Marine Recorder
NRW_DS114501
- Resource type
- Dataset
- Metadata Date
- 2024-12-09T12:40:25.668Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0