Holyhead Harbour Carpet Sea Squirt Survey Data November 2020

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  • wel
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This is the raw data from a dive survey of Holyhead harbour in November 2020, which focussed on mapping the distribution of the invasive non-native species Carpet seasquirt, Didemnum vexillum. It contains; • Video (MP4) and image files (JPG and ARW) of underwater habitats and species taken during the surveys • Drone aerial images and videos of the current layout of the pontoons and mooring buoys (JPG and DNG and MP4). • An Excel spreadsheet of sites surveyed • Data recording forms – PDF copies of dive log sheets and recording forms This data accompanies; Holt, R.H.F. 2018. Didemnum vexillum: survey of distribution and extent in Holyhead Harbour – November 2020. NRW Evidence report no. 538. 29 pp.

Identification

Dynodydd
Identifier
NRW_DS125390
Teitl Amgen
Alternative Title
  • Holyhead Harbour dive survey data mapping the distribution of the non-native species Carpet sea squirt, Didemnum vexillum.
Laith Metadata
Metadata Language
English
Lineage

Video and image files – these are taken to represent the full range of different habitats in Holyhead Harbour and show a range of native and non-native species which occur in the marina as part of the survey. These videos and images were taken with underwater camera apparatus. Drone aerial images and videos of the current layout of the pontoons and mooring buoys – taken with a drone piloted by CloudBase Productions. An Excel spreadsheet of sites surveyed - ‘Holyhead D vex survey results 20201103-05’ – this is a summary of the locations of the images and sites surveyed which accompanies the report Data recording forms – PDF copies of dive log sheets and recording forms – these were filled out by the dive contractors during the survey.
Additional Information

The data accompanies the following report; Holt, R.H.F. 2018. Didemnum vexillum: survey of distribution and extent in Holyhead Harbour – November 2020. NRW Evidence report no. 538. 29 pp.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2022-11-09
Perchennog
Owner
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Cloud Base Productions Ltd.
Cloud Base Productions Ltd., Tan Hwfa, Llanllechid, Bangor, LL57 3LA
www.cloudbasepro.co.uk
 

Extent

Extent

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


 

Vertical Extent

Medin Extent Keyword

infralittoral

Maint Fertigol
Vertical Extent

Gwerth lleiaf
Minimum value (metres)
0
Gwerth uchaf
Maximum value (metres)
10
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
  • Image ()

    Specification

    Images - Photographs of the Didemnum vexillum seen on the dive survey, along with images of other habitats and native species (JPG and ARW). Images taken by drone of the current layout of the pontoons and mooring buoys (JPG and DNG). Movie - Videos of the results of the dive survey showing underwater habitats and species. Also, some aerial footage of the harbour (MP4). Documents - A spreadsheet of sites surveyed – see ‘Holyhead D vex survey results 20201103-05’ Excel spreadsheet (Excel) -Data recording forms – copies of dive log sheets and recording forms (PDF)

 

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

Video and image files – these are taken to represent the full range of different habitats in Holyhead Harbour and show a range of native and non-native species which occur in the marina as part of the survey. These videos and images were taken with underwater camera apparatus. Drone aerial images and videos of the current layout of the pontoons and mooring buoys – taken with a drone piloted by CloudBase Productions. An Excel spreadsheet of sites surveyed - ‘Holyhead D vex survey results 20201103-05’ – this is a summary of the locations of the images and sites surveyed which accompanies the report Data recording forms – PDF copies of dive log sheets and recording forms – these were filled out by the dive contractors during the survey.
 

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
  • Didemnum vexillum
  • Holyhead
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
  • Habitat characterisation
  • Seabed photography
Math
Type
Theme
Theme

Dyfyniad
Citation

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

Spatial Reference System

Code
NONE
 

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

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

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© 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.
 
 
 

Metadata

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313235333930 XML
Laith Metadata
Metadata Language
English
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2024-05-31T09:38:47.831Z
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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