Across Wales Drop-Down Video Monitoring: North Llyn Ground Truthing (2011)

A drop-down video survey carried out in North Wales. This work was carried out by former Countryside Council for Wales (CCW) and focused on the North Llyn area. Subsequent analysis of the video taken was undertaken by Marine Ecological Solutions Ltd on behalf of CCW. This work was conducted as part of a ground truthing exercise through which the extent and quality of Modiolus mussel beds could be assessed.

Dynodydd: NRW_DS114499

Teitl Amgen

2011 DRAFT CCW Towed Survey of North Llyn Modiolus (Additional Area) MRCCW31700000005
2011 CCW Towed Survey of North Llyn Modiolus (Additional Area).
Gwaith monitro cwymp-gamerau fideo ar draws Cymru 2011: Gwirio Gogledd Llyn

Laith Metadata: English

Datganiad: Drop-down video is useful for gathering large volumes of data across wide areas of seabed and often to depths beyond which diver observations can be safely made. Amendments to the previous methods include the addition of a HD video camera system manufactured by C-Technics in place of the SD camera previously used. A Cannon EOS 400D digital SLR was also used in a housing manufactured by Rovtech systems. Photographic stills were taken every 11 seconds along the tows to assist with species and habitat validation. Following methodological and equipment trial (Sanderson et al, 2001; Southeran et al, 2004) drop-down video survey methods were employed extensively in Welsh Special Areas of Conservation (SACs) in 2004 and 2005 (Axelsson et al, 2006). The 2004 survey work focused on Cardigan Bay SAC, while the 2005 survey work focused on Pen Llyn a'r Sarnau, Menai Strait and Conwy Bay, Cardigan Bay and Pembrokeshire Marine. Between 2007 and 2010 work focused on the Pen Llyn a'r Sarnau Modiolus reef. Additional work was carried out in Milford Haven (Crepidula and Seagrass beds) and St Bride's Bay to look at possible anchor damage. In 2011 DDV was also carried out around Puffin Island in Anglesey.

Gwybodaeth ychwanegol: Detailed methods and site locations are described in CCW Marine Monitoring report 24a.

Dyddiad cyfeirnod y set ddata (Cyhoeddiad): 2011-06-10

Ystod amser

Dyddiad cychwyn: 2011-06-09

Dyddiad gorffen: 2011-06-10

Categori pwnc

Oceans
Biota

Perchennog

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Cychwynnwr

Countryside Council for Wales (CCW). Marine and Freshwater Ecosystems Group

Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://www.ccw.gov.uk

Cychwynnwr

Marine Ecological Solutions Ltd

Marine Ecological Solutions Ltd, 41 High Street, Menai Bridge, Ynys Mon, LL59 5EF, Wales

http://www.marine-ecosol.co.uk

Rhychwant

Hyd: Wales (WLS)

Map representing the geographic extent of the dataset

Maint Fertigol

Maint allweddair MEDIN: benthic boundary layer

Maint Fertigol

Gwerth lleiaf: 13

Gwerth uchaf: 25

System Gyfeirio Cydlynu Fertigol: urn:ogc:def:datum:EPSG::5100 Sea Level depth is unadjusted and does not take into account tidal height

Fformat - Math a Disgrifiad

Documents Documents ()

Math

[A] Recorded directly onto hard drive as .asf files. [B] Still images in jpg format. [C] Site details and video metadata data in excel spreadsheets. [D] A subset of the videos analysed and habitat and species data entered into Marine Recorder [MRCCW31700000005]

Ansawdd Data

Cwmpas Ansawdd: Dataset

Cydymffurfiad: 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
Eglurhad
Gradd: false

Datganiad: Drop-down video is useful for gathering large volumes of data across wide areas of seabed and often to depths beyond which diver observations can be safely made. Amendments to the previous methods include the addition of a HD video camera system manufactured by C-Technics in place of the SD camera previously used. A Cannon EOS 400D digital SLR was also used in a housing manufactured by Rovtech systems. Photographic stills were taken every 11 seconds along the tows to assist with species and habitat validation. Following methodological and equipment trial (Sanderson et al, 2001; Southeran et al, 2004) drop-down video survey methods were employed extensively in Welsh Special Areas of Conservation (SACs) in 2004 and 2005 (Axelsson et al, 2006). The 2004 survey work focused on Cardigan Bay SAC, while the 2005 survey work focused on Pen Llyn a'r Sarnau, Menai Strait and Conwy Bay, Cardigan Bay and Pembrokeshire Marine. Between 2007 and 2010 work focused on the Pen Llyn a'r Sarnau Modiolus reef. Additional work was carried out in Milford Haven (Crepidula and Seagrass beds) and St Bride's Bay to look at possible anchor damage. In 2011 DDV was also carried out around Puffin Island in Anglesey.

Allweddair

GEMET - INSPIRE themes, version 1.0

Habitats and biotopes

Math: Theme

Dyfyniad

Dyddiad (Cyhoeddiad): 2008-06-01

Cod: geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Allweddair

NRW Thesaurus

Video survey
benthic marine habitats
drop-down video
towed video

Math: Theme

Dyfyniad

Dyddiad (Cyhoeddiad): 2023-12-31

Cod: geonetwork.thesaurus.local.theme.converted_nrw-keywords

Allweddair

SeaDataNet Parameter Discovery Vocabulary

Habitat characterisation

Math: Theme

Dyfyniad

Dyddiad (Adolygu): 2021-01-06

Cod: geonetwork.thesaurus.external.theme.rdf+xml

Cod: Latitude and Longitude (EPSG::4326)

Gwybodaeth Cynnwys

Proffil CNC

Elfennau CNC

Cyfyngiadau

Cyfyngiadau ar Fynediad a Defnydd Cyhoeddus

Math o Gyfyngiad: Other restrictions

Cyfarwyddeb Cyfyngiadau Mynediad

Cyfyngiadau: no limitations

Testun cyfyngiadau mynediad

Cyfyngiadau eraill: Part of this dataset is sensitive and restricted. The sensitive data is as follows Ostrea edulis, Palinurus elephas. 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 Officer. Data may be released freely if the sensitive records are removed in advance, or shown only at a coarser scale.

Defnyddiwch gyfyngiadau

Cyfyngiadau Defnyddio: Other restrictions

Cyfyngiadau eraill: © CNC/NRW 2011. 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. wn only at a coarser scale.

Metadata

Dynodydd Ffeil: 4f4c4942-4343-5764-6473-313134343939 XML

Laith Metadata: English

Dynodydd Rhiant: Natural Resources Wales (NRW) Marine Benthic Species and Habitat Collation Held in Marine Recorder
NRW_DS114501

Math o adnodd: Dataset

Dyddiad Metadata: 2024-05-31T09:31:45.923Z

Enw Safonol Metadata: NRW

Fersiwn Metadata: 1.0

Pwynt Cyswllt

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Corff Cyhoeddi

Mynediad i'r Porth

Mynediad llawn i'r porth a'r metadata.

Across Wales Drop-Down Video Monitoring: North Llyn Ground Truthing (2011)

Dull adnabod

Ystod amser

Rhychwant

Rhychwant

Maint Fertigol

Maint Fertigol

Dosbarthiad

Ansawdd

Ansawdd Data

Allweddeiriau

Allweddair

Dyfyniad

Allweddair

Dyfyniad

Allweddair

Dyfyniad

System Cyfeirio Gofodol

Cynnwys

Gwybodaeth Cynnwys

Proffil CNC

Elfennau CNC

Cyfyngiadau

Cyfyngiadau

Cyfyngiadau ar Fynediad a Defnydd Cyhoeddus

Cyfarwyddeb Cyfyngiadau Mynediad

Testun cyfyngiadau mynediad

Defnyddiwch gyfyngiadau

Metadata

Metadata

Corff Cyhoeddi