Bangor University School of Ocean Science (SOS) Prince Madog Towed Video Survey of Tremadog Bay (2013)
Surveys of seabed in Tremadog Bay, carried out by the School of Ocean Sciences (SOS), Bangor University, in July 2013, as part of European Fisheries Fund (EFF) funded research into fisheries and seabed habitats. This dataset is derived only from drop-down video (1 tow) and associated still images collected by SOS from the RV Prince Madog, using a sledge with combined video cameras and stills camera. The survey area was about 6 km offshore of Abersoch. The tow length was 430m and seabed consisted primarily of coarse sand. The videos were analysed by Coastal Assessment, Liaison and Monitoring (CALM) to describe the seabed habitats and communities and assign them to biotopes. The main aim of the survey work by the School of Ocean Sciences was to assess the characteristics and status of offshore benthic habitats, as part of a study on the effects of scallop dredging. The aim of the subsequent data capture was to improve CCW's seabed habitat mapping for Tremadog Bay and assign biotopes. High - experienced surveyors followed by experienced video and stills analysis.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS115576
- Alternative Title
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- 2013 DRAFT Bangor University SOS Prince Madog Towed Video Survey of Tremadog Bay, July MRCCW31600000017
- Arolwg Fideo Llusg SOS Prince Madog Prifysgol Bangor ym Mae Tremadog, 2013
- Metadata Language
- English
- Lineage
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Drop-down video tows were carried out with a GoPro video camera and a stills camera attached to a sledge towed behind RV Prince Madog. GoPro video footage was recorded onto MP4 files. Stills camera images are .JPG files. The arrangement of the videos and cameras is described below: The middle width of the GoPro videos is about 96cm for the ones that are at an angle (80 at the bottom and >112 at the top) while the ones which face straight down are 80 cm wide. The still camera is a Canon 400D, with field of view of ca. 0.13m2 (44cm by 30cm). The middle width of the videos on the CDs are 41cm. A manual log was kept of the position and time at the start and end of transect while the camera was on the bottom. Videos and images were analysed by a marine biological surveyor (Jen Jones) to record information on habitat character, conspicuous species and their abundance. Habitat descriptions and assignment of biotopes from the national biotope classification to each record were also recorded. Analysis included a QA process to validate and verify the recorded data. The surveys are part of a 3-year EFF funded project on habitat mapping and effects of fisheries, particularly scallop dredging.
- Dataset Reference Date (Publication)
- 2013-12-31
Temporal Extent
- Begin date
- 2013-07-30
- End date
- 2013-07-30
- Topic category
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- Biota
Extent
Extent
- Geographic Extent
- GWYNEDD - GWYNEDD
))
Vertical Extent
- Medin Extent Keyword
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benthic boundary layer
Distribution
- Format Type and Description
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Documents
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- Specification
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[A] Digital videos in .MP4 files. [B] Still images in .JPG files. [C] Field logs of dates, start and end positions (Lat/Long) and times for tows etc in Excel spreadsheets. [D] Analysis data (by CALM) in Excel spreadsheets and Marine Recorder (NBN) datafile. Marine Recorder Survey key: MRCCW31600000017
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Documents
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Quality
Data quality
- Quality Scope
- Dataset
- 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
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This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Degree
- false
- Lineage
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Drop-down video tows were carried out with a GoPro video camera and a stills camera attached to a sledge towed behind RV Prince Madog. GoPro video footage was recorded onto MP4 files. Stills camera images are .JPG files. The arrangement of the videos and cameras is described below: The middle width of the GoPro videos is about 96cm for the ones that are at an angle (80 at the bottom and >112 at the top) while the ones which face straight down are 80 cm wide. The still camera is a Canon 400D, with field of view of ca. 0.13m2 (44cm by 30cm). The middle width of the videos on the CDs are 41cm. A manual log was kept of the position and time at the start and end of transect while the camera was on the bottom. Videos and images were analysed by a marine biological surveyor (Jen Jones) to record information on habitat character, conspicuous species and their abundance. Habitat descriptions and assignment of biotopes from the national biotope classification to each record were also recorded. Analysis included a QA process to validate and verify the recorded data. The surveys are part of a 3-year EFF funded project on habitat mapping and effects of fisheries, particularly scallop dredging.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
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NRW Thesaurus
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- benthic marine habitats
- Video survey
- Type
- Theme
Citation
- Date (Publication)
- 2026-07-24
Keywords
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
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Video Footage and Images: This dataset is wholly owned by School of Ocean Sciences, Bangor University. Enquirers are advised to obtain a copy from the owner/originator directly, rather than NRW. NRW may NOT publish or disseminate it in its entirety. Species Data: Species data is owned by Natural Resources Wales (NRW). Part of this dataset is sensitive and restricted as it contains data exempt from general release under EIR. Sensitive data must be kept confidential; general release is not permitted due to risk of harm to the environment or third parties.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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Video Footage and Images: © School of Ocean Sciences, Bangor University. NRW does NOT grant permission to third parties to re-use or disseminate this dataset. Species Data: © CNC/NRW Data may be re-used under provision and in line with the terms of a NRW licence and NRWs guidance on Ecological data exempt from general release.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313135353736 XML
- Metadata Language
- English
- Parent Identifier
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Natural Resources Wales (NRW) Marine Benthic Species and Habitat Collation Held in Marine Recorder
NRW_DS114501
- Resource type
- Dataset
- Metadata Date
- 2026-08-21T14:58:38.427Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0