NRW_DS115296 eng dataset Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en pointOfContact 2026-03-03T14:33:50 MEDIN 3.1.2 wel eng utf8 Latitude and Longitude (EPSG::4326) Drop-Down Video North Wales Survey 2012 Drop-Down Video North Wales Survey 2012 Fideo Tanddwr Arolwg Gogledd Cymru CCGC 2012 CCW Drop Down Video North Wales Survey 2012 2012 CCW Drop Down Video North Wales Survey MRCCW31600000009 2012-11-30 publication 4f4c4942-4343-5764-6473-313135323936 Drop down video survey of seabed off the north coast of Pen Llyn and in Tremadog Bay, North Wales, carried out by Countryside Council for Wales (CCW) in 2012. The dataset comprises of 26 video tows each of approximately 10 minutes in length with a set of still images that are taken approximately every 10 seconds along the length of the tow. Videos and stills subsequently analysed by Coastal Assessment, Liaison and Monitoring, under contract to CCW, to describe habitats, species and biotopes. The purpose of this data capture was to improve CCW's seabed habitat maps in those areas. 4 sites off the north coast of Pen Llyn, between Porth Dinllaen and Porth Colman, and 22 sites distributed around the northern half of Tremadog Bay. Drop down video survey of seabed off the north coast of Pen Llyn and in Tremadog Bay, North Wales, carried out by Countryside Council for Wales (CCW) in 2012. The dataset comprises of 26 video tows each of approximately 10 minutes in length with a set of still images that are taken approximately every 10 seconds along the length of the tow. Videos and stills subsequently analysed by Coastal Assessment, Liaison and Monitoring, under contract to CCW, to describe habitats, species and biotopes. The purpose of this data capture was to improve CCW's seabed habitat maps in those areas. 4 sites off the north coast of Pen Llyn, between Porth Dinllaen and Porth Colman, and 22 sites distributed around the northern half of Tremadog Bay. Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en owner Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en custodian Countryside Council for Wales (CCW) Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW enquiries@naturalresourceswales.gov.uk http://naturalresourceswales.gov.uk/splash?orig=/ originator Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en distributor notPlanned Habitats and biotopes theme GEMET - INSPIRE themes, version 1.0 2008-06-01 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme benthic marine habitats Video survey theme NRW Thesaurus 2025-01-08 publication geonetwork.thesaurus.local.theme.converted_nrw-keywords Zoobenthos taxonomic abundance Seabed photography Habitat characterisation theme SeaDataNet Parameter Discovery Vocabulary 2024-06-19 publication geonetwork.thesaurus.external.theme.rdf+xml otherRestrictions There are no access restrictions on this data. NRW may release, publish or disseminate it freely. no limitations otherRestrictions © CNC/NRW 2012. Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and copyright of the owners. It is the recipient's responsibility to ensure the data is fit for the intended purpose. Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Open Government Licence vector eng utf8 biota SeaVoX Vertical Co-ordinate Coverages 2021-01-06 revision benthic boundary layer NRW Geographic Identifiers Collection 2024-01-01 publication GWYNEDD - GWYNEDD -4.91833423 -4.10794866 52.72562274 53.12958294 2012-06-27 2012-07-05 -3.2 -35.5 Movie Unknown [A] Video files Streamed direct from camera in .asf format Image Unknown [B] Still images take direct from the sledge camera in jps format Delimited MS Excel [C] Spreadsheet data (field notes - Start and Stop lat/longs and times from the video and field notes about the video taken on board the boat Documents Unknown [D] Field notes held in field note book and filed locally (typed up in [C]) Geographic Information System MapInfo [E] GIS data in MapInfo .tab file format (start and end points and vessel tracks for each station) - These are available as complete points and track for whole survey event and also as individual files for each station. - NB as work was carried out in conjunction with Additional north Llyn work and MCZ work, tracks may be available in media 1360 or 1361 (see Internal location) Database Marine Recorder [F] Species data in Marine Recorder survey: MRCCW31600000009 dataset 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 2010-12-08 publication This dataset has not been assessed for conformance to the referenced INSPIRE regulation. false Drop down video survey was conducted from Countryside Council for Wales' (CCW) survey boat Pedryn, an 11.7 m Delta cabined RIB. The CCW camera system is C-Vision HD with a C-vision mantis HD camera video recorder, a 200 m umbilical cable, a video camera in a waterproof housing mounted on a metal frame sled with two HID lights mounted on either side of the camera. In addition, a laser scaling device comprising two parallel laser beams, 10 cm apart, provide an indication of size and scale. The auto stills camera is a Seacam Digital still camera (18 mega pixel CMOS chip) with dual Seabeam underwater Strobe lamps. The surface control unit overlays realtime data such as time, date, depth of camera and position of vessel on the captured video which are recorded to the miniDV recorder. The camera was towed for approximately ten minutes at each location, recording continuous video plus still images every 10 seconds. The sled was towed at 0.5-1.0 knot (ideally) across the seabed either by drifting with the currents or using the drive of the vessel. A manual log was kept of the position and depth at the start and end of transect plus details of substratum type and main taxa observed on the screen during the tow. Video and stills were subsequently analysed by a experienced marine biological surveyor to record information on habitat character, conspicuous species and their abundance (SACFOR scale), and to assign biotopes from the national biotope classification. Analysis included a QA process to validate and verify the recorded data. Drop down video survey was conducted from Countryside Council for Wales' (CCW) survey boat Pedryn, an 11.7 m Delta cabined RIB. The CCW camera system is C-Vision HD with a C-vision mantis HD camera video recorder, a 200 m umbilical cable, a video camera in a waterproof housing mounted on a metal frame sled with two HID lights mounted on either side of the camera. In addition, a laser scaling device comprising two parallel laser beams, 10 cm apart, provide an indication of size and scale. The auto stills camera is a Seacam Digital still camera (18 mega pixel CMOS chip) with dual Seabeam underwater Strobe lamps. The surface control unit overlays realtime data such as time, date, depth of camera and position of vessel on the captured video which are recorded to the miniDV recorder. The camera was towed for approximately ten minutes at each location, recording continuous video plus still images every 10 seconds. The sled was towed at 0.5-1.0 knot (ideally) across the seabed either by drifting with the currents or using the drive of the vessel. A manual log was kept of the position and depth at the start and end of transect plus details of substratum type and main taxa observed on the screen during the tow. Video and stills were subsequently analysed by a experienced marine biological surveyor to record information on habitat character, conspicuous species and their abundance (SACFOR scale), and to assign biotopes from the national biotope classification. Analysis included a QA process to validate and verify the recorded data.