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.

Identifier: NRW_DS116518

Alternative Title

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: These data are part of an annual program of monitoring of these particular seagrass beds from 2008 to 2012.

Additional Information: 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

Temporal Extent

Begin date: 2012-10-05

End date: 2012-11-27

Topic category

Biota
Imagery base maps earth cover

Owner

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Originator

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Extent

Geographic Extent: Wales (WLS)

Vertical Extent

Medin Extent Keyword: benthic boundary layer; water column boundary layer

Vertical Extent

Minimum value (metres): 2

Maximum value (metres): 7

Vertical CRS

Format Type and Description

Documents ()

Specification

[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.

Data quality

Quality Scope: Dataset

Conformity: Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
Explanation
Degree: false

Lineage: These data are part of an annual program of monitoring of these particular seagrass beds from 2008 to 2012.

Keywords

GEMET - INSPIRE themes, version 1.0

Type: Theme

Citation

Date (Publication): 2008-06-01

Code: geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Keywords

NRW Thesaurus

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

Code: geonetwork.thesaurus.local.theme.converted_nrw-keywords

Keywords

SeaDataNet Parameter Discovery Vocabulary

Macroalgae and seagrass taxonomy-related counts

Type: Theme

Citation

Date (Revision): 2021-01-06

Code: geonetwork.thesaurus.external.theme.rdf+xml

Code: British National Grid (EPSG::27700)

Content Information

NRW Profile

Custom Elements

Constraints

Limitations on Public Access and Use

Restriction type: Other restrictions

Access Constraints Directive

Limitations: no limitations

Access Constraints Text

Other constraints: 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: © 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

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: 1.0

pointOfContact

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

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Intertidal Special Area of Conservation (SAC) Monitoring Menai Strait and Conwy Bay (2012): Evaluating Intertidal Seagrass Beds – Field Survey Versus Remote Sensing

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Vertical Extent

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Quality

Data quality

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Citation

Keywords

Citation

Keywords

Citation

Spatial Reference System

Content

Content Information

NRW Profile

Custom Elements

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Constraints

Limitations on Public Access and Use

Access Constraints Directive

Access Constraints Text

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