Intertidal Special Area of Conservation (SAC) Monitoring Menai Strait and Conwy Bay (2012): Evaluating Intertidal Seagrass Beds – Field Survey Versus Remote Sensing
Seagrass beds are of special interest in Wales as features under the Wildlife and Countryside Act 1981 (as amended), a Section 42 habitat under the NERC Act (2006), a subfeature of Special Areas of Conservation under the Habitats Regulations and is a biological quality element (marine angiosperms) under the Water Framework Directive. As such, it is crucial that a reliable method of evaluating the quality (extent, density and species richness) of the seagrass beds is used. Traditionally, field observations are made, and records of the presence and extent derived from mapping using a GPS. Until recent years, the resolution of aerial photographs, taken from aircraft, has not been high enough to differentiate seagrass beds, unless they are particularly dense, with clearly defined edges. Many of the intertidal seagrass beds in Wales are patchy and of low density (5-50% cover) and cannot be identified reliably from 1:5,000 aerial photographs. This study uses an unmanned aerial vehicle to take higher resolution images, by flying lower, along with GPS positions, allowing for the many images to be stitched together and be orthorectified. The two methods are compared, each one proving to have certain benefits and short-comings.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS116518
- Alternative Title
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- Ardal Cadwraeth Arbennig (ACA) rynglanwol yn monitro Afon Menai a Bae Conwy (2012): Gwerthuso gwelyau o wellt-y-gamlas rhynglanwol – arolwg maes yn erbyn synhwyro o bell
- Evaluating intertidal seagrass Zostera noltii beds – field survey vs remote sensing
- Metadata Language
- English
- Lineage
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These data are part of an annual program of monitoring of these particular seagrass beds from 2008 to 2012.
- Additional Information
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Brazier, D. P. 2013. Evaluating intertidal seagrass Zostera noltii beds –field survey vs remote sensing. CCW Marine Monitoring Report No: 103, pp 16 + v, Countryside Council for Wales, Bangor.
- Dataset Reference Date (Publication)
- 2013-12-31
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Vertical Extent
- Medin Extent Keyword
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benthic boundary layer; water column boundary layer
Vertical Extent
- Minimum value (metres)
- 2
- Maximum value (metres)
- 7
- Vertical CRS
Distribution
- Format Type and Description
-
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Documents
()
- Specification
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[A] Report Citation: Brazier, D. P. 2013. Evaluating intertidal seagrass Zostera noltii beds –field survey vs remote sensing. CCW Marine Monitoring Report No: 103, pp 16 + v, Countryside Council for Wales, Bangor. [B] GIS Data: TLafan 2012 Zos relocated.TAB and associated layers [C] Flight images in MapInfo and ArcMap and derived layers. [D] Images of the Zostera bed in the field.
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Documents
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
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These data are part of an annual program of monitoring of these particular seagrass beds from 2008 to 2012.
Keywords
Keywords
Keywords
- NRW Thesaurus
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- Traeth Lafan (Traeth Lavan)
- zostera noltii
- aerial surveys
- aerial photography (air photography) (aerial photographs)
- Menai Strait and Conwy Bay cSAC
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Keywords
- SeaDataNet Parameter Discovery Vocabulary
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- Macroalgae and seagrass taxonomy-related counts
- Type
- Theme
Citation
- Date (Revision)
- 2021-01-06
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
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There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose .
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313136353138 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2024-05-31T09:40:21.748Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0