Bangor University Acoustic Multibeam Echosounder Survey of the North Llyn Modiolus Bed 2008 (3rd Party Data)
This is a multibeam echosounder (MBES) dataset covering the extent of the original horse mussel (Modiolus modiolus) bed off the north coast of the Llyn Peninsular, just west of Porth Dinllaen. The area surveyed is approximately 13 km long and 4 km wide. Additional boat time between British Geological Survey (BGS) surveys was utilised to provide coverage of the North Llyn Modiolus bed. The dataset has been subsequently used by former Countryside Council for Wales (CCW), now Natural Resources Wales (NRW) for modiolus monitoring work; and, by Bangor University for teaching and Master of Science (MSc) project work. The confidence in this dataset is high. The data has been tidally corrected although a couple of small gaps exist. It is not clear whether the data meets International Hydrographic Organisation (IHO) order 1 standards.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- EXT_DS114968
- Alternative Title
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- Data ecoseinydd amlbaladr gwely modiolus Gogledd Llyn 2008
- North Llyn modiolus bed multibeam echosounder data 2008
- Metadata Language
- English
- Lineage
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The area surveyed extends from Porth Dinllaen in a south-west direction to just west of Porth Ysgaden on the north side of the Llyn Peninsular, north west Wales. The survey data was collected aboard the Bangor University Research Vessel (RV) Prince Madog using the British Geological Survey (BGS) Kongsburg EM 3002 multibeam system. The data was then processed at the Centre for Environment, Fisheries and Aquaculture Science (Cefas) and tidally corrected using the OLEX bathymetric system. A tide gauge was installed close by (at Porth Ysgaden) to provide the data for tidal correction, which was corrected to the Holyhead base station and then to Ordnance Datum Newlyn.
- Additional Information
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Analysis of the 2008 multibeam data and modiolus extent is written up in "Gibbs P. E. (2008) Acoustic monitoring of sensitive protected habitats. MSc Applied Marine Geoscience School of Ocean Sciences Bangor University." Data can be compared to the multibeam survey done in 2005 part of which covers the same area as portions of the HABMAP (habitat mapping) project. See page 26 of the MSc report for more details about how the data was tidally corrected.
- Dataset Reference Date (Publication)
- 2012-07-06
Extent
Extent
- Geographic Extent
- GWYNEDD - GWYNEDD
))
Vertical Extent
- Medin Extent Keyword
-
benthic boundary layer
Vertical Extent
- Minimum value (metres)
- -15m
- Maximum value (metres)
- -17m
- Vertical CRS
Distribution
- Format Type and Description
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-
Image
Image
()
- Specification
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[A] Fledermaus .SD file. GeoTiff; [B] GIS Mapinfo Layers
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Image
Image
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
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The area surveyed extends from Porth Dinllaen in a south-west direction to just west of Porth Ysgaden on the north side of the Llyn Peninsular, north west Wales. The survey data was collected aboard the Bangor University Research Vessel (RV) Prince Madog using the British Geological Survey (BGS) Kongsburg EM 3002 multibeam system. The data was then processed at the Centre for Environment, Fisheries and Aquaculture Science (Cefas) and tidally corrected using the OLEX bathymetric system. A tide gauge was installed close by (at Porth Ysgaden) to provide the data for tidal correction, which was corrected to the Holyhead base station and then to Ordnance Datum Newlyn.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
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- modiolus modiolus
- horse mussel
- Pen Llyn a'r Sarnau SAC
- multibeam
- 3rd Party Data
- Third Party Data
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Keywords
- SeaDataNet Parameter Discovery Vocabulary
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- Acoustic backscatter in the water column
- Bathymetry and Elevation
- 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
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This dataset is wholly owned by Bangor University (School of Ocean Sciences). NRW may provide access to this dataset on request in some circumstances. However, enquirers are advised to obtain a copy from the owner/originator directly, rather than NRW. NRW may NOT publish or disseminate it in its entirety.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© Bangor University 2012. NRW does NOT grant permission to third parties to re-use or disseminate this dataset. Those seeking such permission should approach the originator directly.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313134393638 XML
- Metadata Language
- English
- Parent Identifier
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Acoustic Monitoring of the Extent of the North Llyn Modiolus Reef
NRW_DS109891
- Resource type
- Dataset
- Metadata Date
- 2024-05-30T15:37:19.342Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0