Aberystwyth to Skomer subtidal lifeforms map
This is the final report on sublittoral mapping of Milford Haven, Pembrokeshire and south Cardigan Bay which formed part of the Broadscale Mapping Project: a project funded by the Crown Estate, the Countryside Council for Wales, English Nature, Scottish Natural Heritage and the Newcastle University (SeaMap). It is supported by the European Commission under the Life programme. The survey of the Milford Haven, Pembrokeshire and south Cardigan Bay has contributed to the development of a methodology for broad scale survey and mapping of large areas of sea floor using acoustic remote sensing techniques. The methodology relies on the relatively inexpensive acoustic ground discrimination system (AGDS) based on a single beam echo sounder. Image processing requires ground truth samples of the biota and habitats from the sea floor and the sampling techniques range from the traditional grab, trawl and dredge to the deployment of remote video.
Simple
- Alternate title
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GB100016
- Alternate title
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EnvPembrokeLF1_O
- Date (Publication)
- 1998-12-01
- Edition date
- 1998-12-01
- Purpose
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Nature conservation
- Credit
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Foster-Smith, R.L., Davies, J. & Sotheran, I. (1999) Broadscale remote survey mapping of sublittoral habitats and biota, Milford Haven, Pembrokeshire and South Cardigan Bay. CCW Contract Science Report No: 381
- Point of contact
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Organisation name Individual name Electronic mail address Role Countryside Council for Wales
Unknown
enquiries@ccw.gov enquiries@ccw.gov.uk
Point of contact
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title
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Habitats
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title
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32E4; 32E5; 33E4; 33E5
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- Place
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Celtic Sea; Irish Sea
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- Use limitation
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Data may only be used with permission from, and according to any conditions imposed by, the data owner(s)
- Spatial representation type
- Vector
- Character set
- UTF8
- Topic category
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- Oceans
- Begin date
- 1994-01-01
- End date
- 1998-12-31
- Reference system identifier
- OSGB36
Distributor
- Distributor contact
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Organisation name Individual name Electronic mail address Role Countryside Council for Wales| Marine Data Manager, Bangor
null null
j.dargie@ccw.gov j.dargie@ccw.gov.uk
Point of contact
- Distributor format
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Name Version Unknown
Unknown
- OnLine resource
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Protocol Linkage Name OGC:WMS
https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_view_maplibrary/wms? gb100016
OGC:WFS
https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_open_maplibrary/wfs? gb100016
WWW:LINK-1.0-http--link
https://files.emodnet-seabedhabitats.eu/data/EMODnetSBHsurvey_GB100016.zip EMODnet Seabed Habitats download
- Hierarchy level
- Dataset
Conceptual consistency
- Name of measure
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MESH Confidence Assessment
- Measure description
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https://www.emodnet-seabedhabitats.eu/resources/mesh-archive/
Quantitative attribute accuracy
- Name of measure
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RemoteTechnique
- Evaluation method description
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An assessment of whether the remote techniques used to produce this map were appropriate to the environment they were used to survey:
3 = technique(s) highly appropriate
2 = technique(s) moderately appropriate
1 = technique(s) inappropriate
Completeness commission
- Name of measure
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RemoteCoverage
- Evaluation method description
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An assessment of the coverage of the remote sensing data including consideration of heterogeneity of the seabed: (See Coverage X Heterogeneity matrix below)
Coverage scores - use these to determine coverage then combine with heterogeneity assessment to derive finale scores
3 = good coverage; 100% (or greater) coverage or AGDS track spacing <50m
2 = moderate coverage; swath approx 50% coverage or AGDS track spacing >100m
1 = poor coverage; large gaps between swaths or AGDS track spacing > 100m
Final scores
3 = good coverage OR moderate coverage + low heterogeneity
2 = moderate coverage + moderate heterogeneity OR poor coverage + low heterogeneity
1 = moderate coverage + high heterogeneity OR poor coverage + moderate or high heterogeneity
Relative internal positional accuracy
- Name of measure
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RemotePositioning
- Evaluation method description
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An indication of the positioning method used for the remote data:
3 = differential GPS
2 = GPS (not differential) or other non-satellite 'electronic' navigation system
1 = chart based navigation, or dead-reckoning
Topological consistency
- Name of measure
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RemoteStdsApplied
- Evaluation method description
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An assessment of whether standards have been applied to the collection of the remote data. This field gives an indication of whether some data quality control has been carried out:
3 = remote data collected to approved standards
2 = remote data collected to ?internal? standards
1 = no standards applied to the collection of the remote data
Temporal validity
- Name of measure
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RemoteVintage
- Evaluation method description
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An indication of the age of the remote data:
3 = < 5yrs old.
2 = 5 to 10 yrs old.
1 = > 10 years old
Non quantitative attribute accuracy
- Name of measure
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BGTTechnique
- Evaluation method description
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An assessment of whether the ground-truthing techniques used to produce this map were appropriate to the environment they were used to survey. Use scores for soft or hard substrata as appropriate to the area surveyed.
Soft substrata predominate (i.e. those having infauna and epifauna)
3 = infauna AND epifauna sampled AND observed (video/stills, direct human observation)
2= infauna AND epifauna sampled, but NOT observed (video/stills, direct human observation)
1 = infauna OR epifauna sampled, but not both. No observation.
Hard substrata predominate (i.e. those with no infauna)
3 = sampling included direct human observation (shore survey or diver survey)
2 = sampling included video or stills but NO direct human observation
1 = benthic sampling only (e.g. grabs, trawls)
Non quantitative attribute accuracy
- Name of measure
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PGTTechnique
- Evaluation method description
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An assessment of whether the combination of geophysical sampling techniques were appropriate to the environment they were used to survey. Use scores for soft or hard substrata as appropriate to the area surveyed.
Soft substrata predominate (i.e. gravel, sand, mud)
3 = full geophysical analysis (i.e. granulometry and/or geophysical testing (penetrometry, shear strenght etc))
2 = sediments described following visual inspection of grab or core samples (e.g. slightly shelly, muddy sand)
1 = sediments described on the basis of remote observation (by camera).
Hard substrata predominate (i.e. rock outcrops, boulders, cobbles)
3 = sampling included in-situ, direct human observation (shore survey or diver survey)
2 = sampling included video or photographic observation, but NO in-situ, direct human observation
1 = samples obtained only by rock dredge (or similar)
Relative internal positional accuracy
- Name of measure
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GTPositioning
- Evaluation method description
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An indication of the positioning method used for the ground-truth data:
3 = differential GPS
2 = GPS (not differential) or other non-satellite 'electronic' navigation system
1 = chart based navigation, or dead-reckoning
Completeness commission
- Name of measure
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GTDensity
- Evaluation method description
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An assessment of what proportion of the polygons or classes (groups of polygons with the same ?habitat? attribute) actually contain ground-truth data:
3 = Every class in the map classification was sampled at least 3 times
2 = Every class in the map classification was sampled
1 = Not all classes in the map classification were sampled (some classes have no ground-truth data)
Conceptual consistency
- Name of measure
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GTStdsApplied
- Evaluation method description
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An assessment of whether standards have been applied to the collection of the ground-truth data. This field gives an indication of whether some data quality control has been carried out:
3 = ground-truth samples collected to approved standards
2 = ground-truth samples collected to 'internal' standards
1 = no standards applied to the collection of ground-truth samples
Temporal validity
- Name of measure
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GTVintage
- Evaluation method description
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An indication of the age of the ground-truth data:
3 = < 5 yrs old
2 = 5 to 10 yrs old
1 = > 10 years old
Topological consistency
- Name of measure
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GTInterpretation
- Evaluation method description
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An indication of the confidence in the biological interpretation of the ground-truthing data:
3 = Evidence of expert interpretation; full descriptions and taxon list provided for each habitat class
2 = Evidence of expert interpretation, but no detailed description or taxon list supplied for each habitat class
1 = No evidence of expert interpretation; limited descriptions available
Completeness commission
- Name of measure
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RemoteInterpretation
- Evaluation method description
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An indication of the confidence in the interpretation of the remotely sensed data:
3 = Appropriate technique used and documentation provided
2 = Appropriate technique used but no documentation provided
1 = Inappropriate technique used
Note that interpretation techniques can range from ?by eye? digitising of side scan by experts to statistical classification techniques.
Completeness commission
- Name of measure
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DetailLevel
- Evaluation method description
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The level of detail to which the 'habitat' classes in the map have been classified:
3 = Classes defined on the basis of detailed biological analysis
2 = Classes defined on the basis of major characterising species or lifeforms
1 = Classes defined on the basis of physical information, or broad biological zones
Thematic classification correctness
- Name of measure
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MapAccuracy
- Evaluation method description
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A test of the accuracy of the map:
3 = high accuracy, proven by external accuracy assessment
2 = high accuracy, proven by internal accuracy assessment
1 = low accuracy, proved by either external or internal assessment OR no accuracy assessment made
Domain consistency
- Name of measure
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Remote
Domain consistency
- Name of measure
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GT
Domain consistency
- Name of measure
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Interpretation
- Statement
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Survey technique(s): Trawls ; Dredges ; Towed video ; AGDS ; Grabs
- Description
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Classification scheme: Lifeforms
- Description
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Classification scheme details: Classified according to lifeforms. 10 categories 5 of which are substrate only
- Description
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Survey technique details: Track spacing >50m. Ground truthing by towed video and grab samples.
- Processor
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Organisation name Individual name Electronic mail address Role SeaMap Research Group (Newcastle University)
SeaMap Research Group (Newcastle University)
Principal investigator
- Description
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Mapping method: Supervised classification
Metadata
- File identifier
- 4df46137-ade4-49c8-a198-6617aac629ff XML
- Character set
- UTF8
- Date stamp
- 2022-02-15T16:26:49
- Metadata standard name
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ISO 19115:2003/19139
- Metadata standard version
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1.0
- Metadata author
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Organisation name Individual name Electronic mail address Role Countryside Council for Wales
Unknown
enquiries@ccw.gov enquiries@ccw.gov.uk
Point of contact