St Tudwal's Islands (Tremadoc Bay) lifeforms map
Mapping the distribution of benthic biotopes at Sarn Badrig and St. Tudwal's Island, Tremadoc Bay was undertaken as part of the BioMar Project, in collaboration with the Countryside Council for Wales. The BioMar team in Newcastle are evaluating methods to generate biotope distribution maps based on continuous data collected using acoustic methods. Point samples of detailed biotope data can be linked to the acoustic map. Acoustic data can validate the interpolation of biotope data and hence increase the degree of confidence attached to a biotope distribution map. These key physical factors can be relatively easily obtained using acoustic methods to give a much greater coverage than could be obtained by direct viewing of the biotopes. Thus biotope mapping is, in principle, a process of matching restricted information on biological components to more general coverage of key physical characteristics of the sea floor.
Simple
- Alternate title
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GB100075
- Alternate title
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EnvSarn2LF_O
- Date (Publication)
- 1994-12-01
- Edition date
- 1994-12-01
- Purpose
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Nature conservation
- Credit
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Davies, J., Foster-Smith, R.L. 1994. Mapping the distribution of benthic biotopes at Sarn Badrig and St. Tudwal's Island, Tremadoc Bay
- Point of contact
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Organisation name Individual name Electronic mail address Role Envision Mapping Ltd
Bob Foster-Smith
r.foster-smith@envision.uk.com smith@envision.uk r.foster-smith@envision.uk.com
Point of contact
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title
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Habitats
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title
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34E5
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- Place
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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
- 1994-12-31
- Reference system identifier
- Image only
Distributor
- Distributor contact
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Organisation name Individual name Electronic mail address Role Envision Mapping Ltd
Bob Foster-Smith
r.foster-smith@envision.uk.com smith@envision.uk r.foster-smith@envision.uk.com
Point of contact
- Distributor format
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Name Version Unknown
Unknown
Distributor
- Distributor contact
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Organisation name Individual name Electronic mail address Role Countryside Council for Wales
null null
enquiries@ccw.gov enquiries@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 WWW:LINK-1.0-http--link
https://www.emodnet-seabedhabitats.eu/access-data/download-data/?gui=GB100075 EMODnet Seabed Habitats Download Page
OGC:WMS
https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_view_maplibrary/wms? gb100075
OGC:WFS
https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_open_maplibrary/wfs? gb100075
- 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): Dredges ; Towed video ; AGDS ; Grabs
- Description
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Classification scheme: Lifeforms
- Description
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Classification scheme details: 5 lifeforms -some just substrate
- Description
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Survey technique details: Track spacing 200m. Ground truthing by towed video, dredge and grab samples.
- Processor
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Organisation name Individual name Electronic mail address Role BioMar team (Newcastle University)
BioMar team (Newcastle University)
Principal investigator
- Description
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Mapping method: Supervised classification
Metadata
- File identifier
- 245b7b09-b8ac-4202-8633-e5038d81ca9b XML
- Character set
- UTF8
- Date stamp
- 2022-02-17T15:24:19
- 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 Envision Mapping Ltd
Bob Foster-Smith
r.foster-smith@envision.uk.com smith@envision.uk r.foster-smith@envision.uk.com
Point of contact