Drop-Down Video North Wales Survey 2012
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.
- Dull adnabod
- Rhychwant
- Dosbarthiad
- Ansawdd
- Allweddeiriau
- System Cyfeirio Gofodol
- Cynnwys
- Cyfyngiadau
- Cynnal a chadw
- Metadata
Dull adnabod
- Dynodydd
- NRW_DS115296
- Teitl Amgen
-
- CCW Drop Down Video North Wales Survey 2012
- 2012 CCW Drop Down Video North Wales Survey MRCCW31600000009
- Fideo Tanddwr Arolwg Gogledd Cymru CCGC 2012
- Laith Metadata
- English
- Datganiad
-
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.
- Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
- 2012-11-30
Ystod amser
- Dyddiad cychwyn
- 2012-06-27
- Dyddiad gorffen
- 2012-07-05
- Categori pwnc
-
- Biota
Rhychwant
Rhychwant
- Hyd
- GWYNEDD - GWYNEDD
))
Maint Fertigol
- Maint allweddair MEDIN
- benthic boundary layer
Maint Fertigol
- Gwerth lleiaf
- 35.5
- Gwerth uchaf
- 3.2
- System Gyfeirio Cydlynu Fertigol
- urn:ogc:def:datum:EPSG::5100 Sea Level depth is unadjusted and does not take into account tidal height
Dosbarthiad
- Fformat - Math a Disgrifiad
-
-
Documents
()
- Math
-
[A] Video files Streamed direct from camera in .asf format [B] Still images take direct from the sledge camera in jps format [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 [D] Field notes held in field note book and filed locally (typed up in [C]) [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) [F] Species data in Marine Recorder survey: MRCCW31600000009
-
Documents
()
Ansawdd
Ansawdd Data
- Cwmpas Ansawdd
- Dataset
- Datganiad
-
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.
Allweddeiriau
Allweddair
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2008-06-01
Allweddair
- NRW Thesaurus
-
- Video survey
- benthic marine habitats
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2023-12-31
Allweddair
- SeaDataNet Parameter Discovery Vocabulary
-
- Habitat characterisation
- Zoobenthos taxonomic abundance
- Seabed photography
- Math
- Theme
Dyfyniad
- Dyddiad (Adolygu)
- 2021-01-06
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
-
There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
Defnyddiwch gyfyngiadau
- Cyfyngiadau Defnyddio
- Other restrictions
- Cyfyngiadau eraill
-
© 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.
Metadata
Metadata
- Dynodydd Ffeil
- 4f4c4942-4343-5764-6473-313135323936 XML
- Laith Metadata
- English
- Math o adnodd
- Dataset
- Dyddiad Metadata
- 2024-12-09T12:37:20.825Z
- Enw Safonol Metadata
- NRW
- Fersiwn Metadata
-
1.0