Llyn Horse Mussel Multibeam Echosounder Survey data 2024
To be added

  • English
  • wel
  • All

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

Dynodydd
Identifier
NRW_DS161323
Teitl Amgen
Alternative Title
  • Pen Llŷn A’r Sarnau SAC Horse Mussel (Modiolus modiolus) Multibeam Echosounder Survey (MBES) data 2024
Laith Metadata
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
Dyddiad cyfeirnod y set ddata (Creu)
Dataset Reference Date (Creation)
2024-12-17
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2024-12-17
Perchennog
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Binnies LTD -
One City Place, Queens Road , Chester , CH1 3BQ
https://binnies.com/
Cychwynnwr
Originator
  Hydrofix - Function performed by the responsible party
Worley Court, 2 Bolesworth Rd, Tattenhall , Chester , CH3 9HW
https://www.hydrofix.co.uk/
 

Extent

Extent

Hyd
Geographic Extent
Wales (WLS)
N
W
E
S
Map representing the geographic extent of the dataset


 

Vertical Extent

Maint Fertigol
Vertical Extent

Gwerth lleiaf
Minimum value (metres)
-25
Gwerth uchaf
Maximum value (metres)
-30
System Gyfeirio Cydlynu Fertigol
Vertical CRS
 
 

Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • Geographic Information System ( Unknown )

 

Quality

Ansawdd Data
Data quality

Cwmpas Ansawdd
Quality Scope
Dataset
Dataset
Cydymffurfiad
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

Allweddair
Keywords

GEMET - INSPIRE themes, version 1.0
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Allweddair
Keywords

NRW Thesaurus
  • Special Areas of Conservation (SAC) (see also Candidate Special Areas of Conservation cSAC)
  • Pen Llyn a'r Sarnau SAC
  • modiolus modiolus
  • horse mussel
  • biogenic reef
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2026-03-04
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords

Allweddair
Keywords

SeaDataNet Parameter Discovery Vocabulary
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2024-06-19
Code
geonetwork.thesaurus.external.theme.rdf+xml
 

Spatial Reference System

Code
British National Grid (EPSG:27700)
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

 

Constraints

Constraints

Limitations on Public Access and Use

Math o Gyfyngiad
Restriction type
Other restrictions
Other restrictions
 

Access Constraints Directive

Limitations
noLimitations
 

Access Constraints Text

Other constraints

There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
 

Use Constraints

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© CNC/NRW. Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose.
 

Attribution Statement

Other constraints

Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
 

Licence

Other constraints
Open Government Licence
 
 
 

Metadata

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313631333233 XML
Laith Metadata
Metadata Language
English
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2026-04-22T14:25:21.033Z
Enw Safonol Metadata
Metadata Standard Name
NRW
Fersiwn Metadata
Metadata Standard Version

1.0

Pwynt Cyswllt
pointOfContact
  Natural Resources Wales -
Maes y Ffynnon , Bangor , LL57 2DW , Wales
 
 

Publishing Body

Access the portal