Llyn Horse Mussel Multibeam Echosounder Survey data 2024
This data is from the 2024 Llyn Horse Mussel (Modiolus modiolus) Multibeam Echosounder Survey (MBES).
The work was carried out by Binnies/Hydrofix funded by Nature Networks as part of an investigation into the decline observed at the reef. Both reefs were mapped to International Hydrographic order (IHO) 1a or higher.
The data was processed and analysed to produce bathymetric surfaces; backscatter mosaics; a seabed classification, including the extents of the mussel beds; and measurements of the mussel bioherms. The results from the 2024 survey were then compared to previous datasets, provided by NRW, from 2005, 2008 and 2015, all of which were analysed and reprocessed.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS161323
- Alternative Title
-
- Pen Llŷn A’r Sarnau SAC Horse Mussel (Modiolus modiolus) Multibeam Echosounder Survey (MBES) data 2024
- Metadata Language
- English
- Lineage
-
The data collected represents the highest quality data so far made available over the survey areas, with higher data density and thus better resolution than previously achieved.
Post processing of all navigation data has ensured the highest levels of positional accuracy, with cm scale accuracies achieved, while the resulting data far exceeds the IHO 1a survey specifications prescribed.
- Additional Information
-
Willcock, J. (2024). Pen Llŷn A’r Sarnau SAC Horse Mussel (Modiolus modiolus) reef MBES survey report (2024) and time series analysis (2005-2024). NRW Evidence Report No: 851, 67pp, Natural Resources Wales
- Dataset Reference Date (Creation)
- 2024-12-17
Temporal Extent
- Begin date
- 2024-06-12
- End date
- 2024-07-02
- Topic category
-
- Biota
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Vertical Extent
Vertical Extent
- Minimum value (metres)
- -25
- Maximum value (metres)
- -30
- Vertical CRS
Distribution
- Format Type and Description
-
-
Geographic Information System
(
Unknown
)
-
Geographic Information System
(
Unknown
)
Quality
Data quality
- Quality Scope
- Dataset
- Conformity
- Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Explanation
-
This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Degree
- false
- Lineage
-
The data collected represents the highest quality data so far made available over the survey areas, with higher data density and thus better resolution than previously achieved.
Post processing of all navigation data has ensured the highest levels of positional accuracy, with cm scale accuracies achieved, while the resulting data far exceeds the IHO 1a survey specifications prescribed.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
-
NRW Thesaurus
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- modiolus modiolus
- biogenic reef
- Special Areas of Conservation (SAC) (see also Candidate Special Areas of Conservation cSAC)
- horse mussel
- Pen Llyn a'r Sarnau SAC
- Type
- Theme
Citation
- Date (Publication)
- 2024-06-19
Keywords
-
SeaDataNet Parameter Discovery Vocabulary
-
- Habitat characterisation
- Type
- Theme
Citation
- Date (Publication)
- 2024-06-19
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Text
- Other constraints
-
Access restrictions on this data have not been determined. It may contain sensitive information and therefore may be restricted under legislation. NRW may provide access to this dataset on request, however NRW may not release, publish or disseminate the data or derived products freely without further assessment.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© CNC/NRW. Data may only be re-used externally under provision and in line with the terms of a NRW licence following an assessment of the data.
Attribution Statement
- Other constraints
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Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.