Needles rMCZ BSH
A broadscale habitat layer was produced by analysising and interpreting the acoustic and ground truth data collected at Needles rMCZ. Particle size data for the sediment samples were used to assign each sample to one of the four sediment classes, namely coarse sediment, sand, mud and mixed sediment. The assignments were used to inform the semi-automated process of map production using object-based image analysis (OBIA). Statistical modelling was combined with the OBIA image analysis to aid production of the final broadscale habitat map.
Simple
- Alternate title
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GB001520
- Date (Publication)
- 2018-04-25
- Date (Creation)
- 2015-01-16
- Citation identifier
- EMODnetSeabedHabitats / GB001520
- Point of contact
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Organisation name Individual name Electronic mail address Role Defra
open@defra.gsi open@defra.gsi.gov.uk
Owner Natural England
enquiries@naturalengland.org enquiries@naturalengland.org.uk
Custodian
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GEMET - INSPIRE themes, version 1.0
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Habitats and biotopes
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- Use limitation
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┬® DAERA. Data may be re-used under the terms of the Open Government Licence.
- Use limitation
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geossAttribution
- Access constraints
- Other restrictions
- Other constraints
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no limitation
- Spatial representation type
- Vector
- Denominator
- 2000
- Language
- English
- Topic category
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- Biota
- Oceans
- Begin date
- 2014-09-09
- End date
- 2014-09-16
- Reference system identifier
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EPSG
/
WGS 84 (EPSG:4326)
/
7.9
- Topology level
- Geometry only
- Distribution format
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Name Version ESRI Shapefile
1.0
- OnLine resource
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Protocol Linkage Name WWW:LINK-1.0-http--link
http://randd.defra.gov.uk/Document.aspx?Document=13534_TheNeedlesrMCZpost-surveySiteReportv6.pdf The Needles rMCZ post-survey Site Report v6
OGC:WMS
https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_view_maplibrary/wms? gb001520
OGC:WFS
https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_open_maplibrary/wfs? gb001520
WWW:LINK-1.0-http--link
https://files.emodnet-seabedhabitats.eu/data/EMODnetSBHsurvey_GB001520.zip EMODnet Seabed Habitats download
- Hierarchy level
- Dataset
Conformance result
- Date (Publication)
- 2009-12-15
- Explanation
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See the referenced specification
- Pass
- Yes
Conformance result
- Date (Publication)
- 2010-12-08
- Explanation
-
See the referenced specification
- Pass
- Yes
- Statement
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Existing swath bathymetry data were used to assist in the interpretation of seabed habitats. Through the Southeast Regional Coastal Monitoring Programme, the inshore 1 km zones of the northern and southern coasts of the Isle of Wight were surveyed in 2011 and Christchurch Bay in 2010. Further offshore, Poole and Christchurch Bays were surveyed in 2012 as part of the MCA UK CHP. The bathymetric data from these two areas were collected as four individual surveys and processed in accordance with the International Hydrographic Organisation (IHO) Standards for Hydrographic Surveys - Order 1a (Special Publication 44, Edition 5). The individual acoustic datasets were available to Ordnance Datum and combined into a single raster in ArcGIS for analysis with the lowest value taken as the depth where datasets overlap. Although previously surveyed by Natural England, data from an area in the south-western corner of the rMCZ were not available and therefore acoustic coverage of the site was not complete.
Ground truth samples were collected by the EA MMS aboard the Solent Guardian in September 2014 (CruiseID: 2GDK70914B). Benthic grabs were used at 33 stations to collect sediments and infauna. An underwater camera system was deployed at 64 stations to collect video and still images of the seabed. Of the 64 samples, 51 could be used to describe BSH (Figure 2; Appendix 1).
A mini-Hamon grab with a sampling area of 0.1 m2 was deployed from the stern gantry of the vessel to collect sediment from the seabed, as described by Ware and Kenny (2011). Sampling positions were recorded (fixed) using TrimbleHYDROpro data acquisition software when the gear made contact with the seabed, with the midpoint of the vesselÔÇÖs stern gantry used as the default offset for position fixing. Once recovered, the sample was emptied into a suitable container, photographed, and the sample volume measured. A sub-sample (approx. 500 ml) of sediment was taken from each sample for particle size analysis (PSA). The remaining sample was washed over a 1 mm mesh sieve to retain the faunal fraction. Retained material was preserved with buffered 8% formaldehyde solution for transfer ashore to a specialist laboratory for analysis.
The SES SeaSpyder camera system was deployed from the stern of the Solent Guardian. Real-time navigation data acquisition and manual position fixing when the gear contacted the seabed was captured via Trimble HYDROpro software and logged by the survey officer. The video footage was annotated with time and position using a SIMRAD MX512 DGPS referenced video overlay. For further detail on ground truth sample collection see The Needles rMCZ Survey Report (Arnold et al., 2014).
All new maps and their derivatives have been projected to WGS84 datum. An indicative broadscale habitat map for the site was produced by analysing and interpreting the available acoustic data collected through the SERCMP, the MCAÔÇÖs UK CHP, and the additional groundtruthing data collected during the dedicated 2014 survey of the site.
The BSHs ÔÇÿA5.1 Subtidal coarse sedimentÔÇÖ and ÔÇÿA5.4 Subtidal mixed sedimentsÔÇÖ were the most widespread habitat types, occupying the majority of the rMCZ site (Figure 4; Table 5). The BSH ÔÇÿA3.2 Moderate energy infralittoral rockÔÇÖ occupies approximately a tenth of the site. The remainder of the site comprises a combination of BSHs ÔÇÿA4.2 Moderate energy circalittoral rockÔÇÖ, and ÔÇÿA5.2 Subtidal sandÔÇÖ. ÔÇÿA5.1 Subtidal coarse sedimentÔÇÖ was identified in the south-western corner, and covering the nearshore rock platform and ridges. The BSH ÔÇÿA5.2 Subtidal sandÔÇÖ is the offshore extension of the sandy beaches on the northwest shoreline of the Isle of Wight. The BSH ÔÇÿA5.4 Subtidal mixed sedimentsÔÇÖ is identified covering the rock platforms and extends to the flanks of the offshore deep water channel and westwards to the southern flank of the extensive offshore bank. The BSH ÔÇÿA4.2. Moderate energy circalittoral rockÔÇÖ occurs on a few isolated north-facing slopes of rock ridge outcrops at the north of the Needles.
Metadata
- File identifier
- bdfcc485-6a89-497e-8c20-455ee696b202 XML
- Metadata language
- English
- Character set
- MD_CharacterSetCode_utf8
- Hierarchy level
- Dataset
- Date stamp
- 2020-01-15T12:19:59
- Metadata standard name
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ISO19115
- Metadata standard version
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2003/Cor.1:2006
- Metadata author
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Organisation name Individual name Electronic mail address Role JNCC
HabitatMapping@jncc.gov HabitatMapping@jncc.gov.uk
Point of contact