Findings of drop down video and stills imagery from an area of drumlins off Northwest Anglesey, July 2019
This data contains the raw products of a seabed survey of an area of drumlins off north west Anglesey. The images and video was taken by a Natural Resources Wales owned drop down camera system to provide a better understanding of the seabed structure and biological communities at the survey sites and to investigate the presence of non-native species. The data contains Video (.asf) (and still images (.JPG) The data was collected on the 11th July 2019. The a copy of the MR snapshot produced after data analysis by the contractor is also supplied here. The analysis of the video and stills imagery followed guidelines provided by NRW, Marine EcoSol’s in-house standard operating procedures, and JNCC/NMBAQC recommendations. The video camera showed a swath of seabed approximately 0.3m wide, while still images showed an area estimated as about 0.13m2. All images were reviewed using appropriate high-quality imaging equipment capable of playing and displaying full HD video at 1920p x 1080p resolution.
The video and set of stills from each tow were reviewed prior to detailed assessment and recording, and the boundaries between biotopes or biotope complexes noted by recording the time and positional coordinates at which major changes in seabed and habitat type occurred. The species and substratum in each habitat ‘sample’ (tow section) was then recorded, and biotopes assigned. Discrete habitat tow sections or ‘samples’ as defined above were determined using a combination of video and stills images. The lower quality video imagery was then linked to the ‘sample’ in terms of data recording using the time stamp on the video playback. Higher quality stills images were used to identify and quantify substrates and taxa, with abundances pooled to assess the abundance of the taxa over each sample.
- Dull adnabod
- Rhychwant
- Dosbarthiad
- Ansawdd
- Allweddeiriau
- System Cyfeirio Gofodol
- Cynnwys
- Cyfyngiadau
- Cynnal a chadw
- Metadata
Dull adnabod
- Dynodydd
- NRW_DS125640
- Laith Metadata
- English
- Datganiad
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The images and video was taken by a Natural Resources Wales owned high definition camera drop down camera system from the survey vessel Mersey Guardian. It was deployed at a total of nine locations situated between 5km and 20km off the north west coast of Anglesey in an area of drumlin fields. Individual tows ranged from 319m to 864m in length most being between 500m and 700m. Depths ranged from 43m to 65m. Over two hours of video footage were collected together with 998 usable still images. Tow speeds ranged from 0.2knots up to 2.6knots, the faster speeds resulting in poor quality video imagery. In general stills image quality was good. All data were entered into Marine Recorder v5.7 under the Marine Recorder survey name ‘2019 Draft NRW Northwest Anglesey Drumlin Survey’. Each tow was a survey event, each habitat section a ‘sample’.
- Gwybodaeth ychwanegol
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Baldock, L., Morris-Webb, L. 2020. Report on findings of drop down video and stills imagery from an area of drumlins off Northwest Anglesey, July 2019. NRW Evidence Report No: 401, 26pp, Natural Resources Wales, Bangor.
- Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
- 2023-07-03
Ystod amser
- Dyddiad cychwyn
- 2019-07-11
- Dyddiad gorffen
- 2019-07-11
- Categori pwnc
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- Biota
Rhychwant
Rhychwant
- Hyd
- Irish Sea
))
Maint Fertigol
- Maint allweddair MEDIN
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circalittoral
Maint Fertigol
- Gwerth lleiaf
- 43
- Gwerth uchaf
- 65
- System Gyfeirio Cydlynu Fertigol
- urn:ogc:def:datum:EPSG::5100 Sea Level depth is unadjusted and does not take into account tidal height
Dosbarthiad
Dosbarthiad
- Fformat - Math a Disgrifiad
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Image
(
)
- Math
-
It showed a swath of seabed approximately 0.3m wide on the seabed. Image: Still images (998) in .JPG format. Database: The MR Snapshot (.dbf) produced by the contractor after analysis of the images and video as part of the contract
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Movie
(
)
- Math
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Video files in Advances Systems Format (.asf) of each tow carried out. It showed a swath of seabed approximately 0.3m wide on the seabed. Image: Still images (998) in .JPG format. Database: The MR Snapshot (.dbf) produced by the contractor after analysis of the images and video as part of the contract
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Documents
(
)
- Math
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NRW Evidence Report available in pdf or word format.
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Image
(
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Ansawdd
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
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This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Gradd
- false
- Datganiad
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The images and video was taken by a Natural Resources Wales owned high definition camera drop down camera system from the survey vessel Mersey Guardian. It was deployed at a total of nine locations situated between 5km and 20km off the north west coast of Anglesey in an area of drumlin fields. Individual tows ranged from 319m to 864m in length most being between 500m and 700m. Depths ranged from 43m to 65m. Over two hours of video footage were collected together with 998 usable still images. Tow speeds ranged from 0.2knots up to 2.6knots, the faster speeds resulting in poor quality video imagery. In general stills image quality was good. All data were entered into Marine Recorder v5.7 under the Marine Recorder survey name ‘2019 Draft NRW Northwest Anglesey Drumlin Survey’. Each tow was a survey event, each habitat section a ‘sample’.
Allweddeiriau
Allweddair
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2008-06-01
Allweddair
-
NRW Thesaurus
-
- towed video
- Drumlins
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2025-01-08
Allweddair
-
SeaDataNet Parameter Discovery Vocabulary
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- Habitat extent
- Habitat characterisation
- Seabed photography
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2024-06-19
System Cyfeirio Gofodol
Cynnwys
Gwybodaeth Cynnwys
Proffil CNC
Elfennau CNC
Cyfyngiadau
Cyfyngiadau
Cyfyngiadau ar Fynediad a Defnydd Cyhoeddus
- Math o Gyfyngiad
- Other restrictions
Cyfarwyddeb Cyfyngiadau Mynediad
- Cyfyngiadau
- no limitations
Testun cyfyngiadau mynediad
- Cyfyngiadau eraill
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There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
Defnyddiwch gyfyngiadau
- Cyfyngiadau Defnyddio
- Other restrictions
- Cyfyngiadau eraill
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© 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 ensur
Datganiad Priodoli
- Cyfyngiadau eraill
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Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
Math o Drwydded
- Cyfyngiadau eraill
- Open Government Licence
Metadata
Metadata
- Dynodydd Ffeil
- 4f4c4942-4343-5764-6473-313235363430 XML
- Laith Metadata
- English
- Math o adnodd
- Dataset
- Dyddiad Metadata
- 2025-02-21T09:47:31.476Z
- Enw Safonol Metadata
- NRW
- Fersiwn Metadata
-
1.0