Towed Video Surveys off the Coastline of the Llyn Peninsula North Wales (2013)

  • English
  • wel
  • All

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

Dynodydd
Identifier
NRW_DS115838
Teitl Amgen
Alternative Title
  • 2013 DRAFT Fisher Survey Towed Video Survey Llyn Peninsula, June. MRCCW31700000014
  • Arolygon fideo llusgedig oddi ar lannau Llyn yng ngogledd Cymru, 2013.
Laith Metadata
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.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2014-10-31
Perchennog
Owner
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Marine Ecological Solutions Ltd
Marine Ecological Solutions Ltd, 41 High Street, Menai Bridge, Ynys Mon, LL59 5EF, Wales
http://www.marine-ecosol.co.uk
 

Extent

Extent

Hyd
Geographic Extent
Irish Sea
Hyd
Geographic Extent
Cardigan Bay
Hyd
Geographic Extent
Tremadog Bay
N
W
E
S
Map representing the geographic extent of the dataset


 

Vertical Extent

Medin Extent Keyword
benthic boundary layer

Maint Fertigol
Vertical Extent

Gwerth lleiaf
Minimum value (metres)
-29
Gwerth uchaf
Maximum value (metres)
-2
System Gyfeirio Cydlynu Fertigol
Vertical CRS
urn:ogc:def:datum:EPSG::5100 Sea Level depth is unadjusted and does not take into account tidal height
 
 

Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • Documents ()

    Specification

    [A] Excel spreadsheets [B] Marine Recorder Survey number: MRCCW31700000014.

 

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
Degree
false
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

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
  • underwater photography
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2023-12-31
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords

Allweddair
Keywords

SeaDataNet Parameter Discovery Vocabulary
  • Seabed photography
  • Habitat characterisation
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Adolygu)
Date (Revision)
2021-01-06
Code
geonetwork.thesaurus.external.theme.rdf+xml
 

Spatial Reference System

Code
Latitude and Longitude (EPSG::4326)
 

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
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

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© 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

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313135383338 XML
Laith Metadata
Metadata Language
English
Parent Identifier
Natural Resources Wales (NRW) Marine Benthic Species and Habitat Collation Held in Marine Recorder

NRW_DS114501
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2024-12-09T12:40:25.668Z
Enw Safonol Metadata
Metadata Standard Name
NRW
Fersiwn Metadata
Metadata Standard Version

1.0

Pwynt Cyswllt
pointOfContact
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 
 

Publishing Body

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