Date (Publication)

2020-08-28

Citation identifier

British Geological Survey / BGS_CMD_REF1432

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Geological Survey (BGS)		enquiries@bgs.ac.uk	Custodian
Welsh Fishermen’s Association (WFA-CFC)		offshoredata@bgs.ac.uk	Originator

Maintenance and update frequency

Not planned

Keywords

• NDGO0001

GEMET - INSPIRE themes, version 1.0

• Geology

SeaVoX Vertical Co-ordinate Coverages (L131)

• soil and sediment
• crust

Access constraints

Other restrictions

Access constraints

Withheld from general circulation or disclosure.

Use constraints

Other restrictions

Other constraints

The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.

Use limitation

unrestricted use, copyright acknowledgement - To use the data, permission must be requested from data owners,Welsh Fishermen’s Association - Cymdeithas Pysgotwyr Cymru (WFA-CPC). No data or information from these archived datasets may be reproduced, transmitted or copied without the permission of the owners, the Welsh Fishermen’s Association - Cymdeithas Pysgotwyr Cymru (WFA-CPC).

Spatial representation type

Grid

Distance

5  urn:ogc:def:uom:EPSG::9001

Language

English

Topic category

• Geoscientific information

Geographic identifier

Western Channel & Celtic Sea

Charting Progress 2: Regional Sea Boundaries 2009-06-18 creation

Geographic identifier

Bristol Channel

BGS Gazetteer 2026-10-13 revision

Geographic identifier

BRISTOL CHANNEL

The SeaVoX Salt and Fresh Water Body Gazetteer: Sub-Ocean Category 1954-01-01 creation

Begin date

2020-07-19

End date

2020-08-28

Reference system identifier

OGP / urn:ogc:def:crs:EPSG::4326

www.epsg.org 2005 revision

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
British Geological Survey (BGS)		enquiries@bgs.ac.uk	Distributor

Hierarchy level

Dataset

Statement

Envision was contracted to undertake the survey on behalf of Welsh Fishermen’s Association (WFA-CFC). This resource is part of a multidisciplinary series 2019-2021 WFA-CPC EMFF PROTECTING OUR SEAS PROJECT (see https://portal.medin.org.uk/portal/start.php#details?tpc=010_d8f12e7ea0689c2c570d15b48a283367). Broad-scale acoustic data was collected using the interferometric swath bathymetric system (GeoSwath Plus) and an Acoustic Ground Discrimination System (RoxAnn™ AGDS). A series of survey lines were planned to incorporate four survey blocks, traversing parallel survey lines throughout each block. The line spacing was 50m and infill line spacing was 25m, with infill used in shallow areas where needed. Survey lines were run to a navigable safe depth and no shallower, at approx. 4knts. At all 12 secondary survey areas, high frequency (1 MHz) sidescan sonar data were collected by deploying the tow fish from the stern of the vessel and traversing parallel lines at a constant speed. The underwater sonar camera system (ARIS 3000) was then towed over the same areas as the vessel drifted with the current/wind at slack tides. Start, end and a continuous log of GPS positions were recorded. Keywords: Welsh Fishermen’s Association - Cymdeithas Pysgotwyr Cymru (WFA-CPC), Severn Esturary/Môr Hafren SAC, Benthic and Geophysical surveys, Sabellaria alveolata, Reef, biogenic, acoustic data, interferometric swath bathymetric system, bathymetry, sidescan sonar, high frequency sidescan sonar, Acoustic Ground Discrimination System (RoxAnn™ AGDS), acoustic imagery data, Acoustic Resonance Inspection System (ARIS Explorer 3000) camera, acoustic reflectance, variable ground, feature identification, Trident SeaStar, fishing activity data.

Metadata

File identifier

e3111bef-cae8-7285-e053-0937940a441b XML

Metadata language

English

Hierarchy level

Dataset

Date stamp

2026-10-13

Metadata standard name

MEDIN Discovery Metadata Standard

Metadata standard version

Version 2.3.5

Metadata author

Organisation name	Individual name	Electronic mail address	Role
British Geological Survey (BGS)		enquiries@bgs.ac.uk	Point of contact