Saltmarsh Features at Pen Llyn a'r Sarnau Special Area of Conservation (SAC) - Dyfi 1993

Use of the National Vegetation Classification (NVC) as a basis for community definition in the saltmarsh habitats of Pen Llyn a'r Sarnau - Dyfi 1993. Dyfi Junction saltmarsh survey.


The main objective of the survey was to use the National Vegetation Classification to describe and map the unusual brackish water saltmarsh communities as well as characterising some of the transitional vegetation types and the glycophytic communities present.

Identification

Identifier
NRW_DS109889
Alternative Title
  • NVC Phase 2 survey of the Dyfi 1993
Metadata Language
English
Lineage

Standard NVC survey methodology. All the homogenous stands of different maritime vegetation were identified and mapped. A 4m2 quadrat was then used to estimate the cover abundance (Domin scale) of all taxa found within selected stands of each vegetation type. Computer software package Vespan II was used to store and handle the quadrat data. Data collected by trained personnel, digitised by contractors, validated by NRW, corrections made by contractors, validated again by NRW, corrections made in-house in conjunction with relevant salt marsh specialist. NRW commissioned survey which contributes to an NVC Saltmarsh survey collation.
Dataset Reference Date (Publication)
1993-12-31
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Originator
  Countryside Council for Wales (CCW) -
Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW
http://naturalresourceswales.gov.uk/splash?orig=/
 

Extent

Extent

Geographic Extent
Wales (WLS)
N
W
E
S
Map representing the geographic extent of the dataset


 

Vertical Extent

Medin Extent Keyword

benthic boundary layer
 
 

Distribution

Distribution

Format Type and Description
  • Geographic Information System ( )

    Specification

    a) GIS products- Vegetation polygons (MapInfo Table) - Site Boundaries (MapInfo Table) - Survey Boundary (MapInfo Table) - Vegetation NVC summaries (MapInfo Table)

  • Documents ( )

    Specification

    b) Paper report

 

Quality

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

This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
Degree
false
Lineage

Standard NVC survey methodology. All the homogenous stands of different maritime vegetation were identified and mapped. A 4m2 quadrat was then used to estimate the cover abundance (Domin scale) of all taxa found within selected stands of each vegetation type. Computer software package Vespan II was used to store and handle the quadrat data. Data collected by trained personnel, digitised by contractors, validated by NRW, corrections made by contractors, validated again by NRW, corrections made in-house in conjunction with relevant salt marsh specialist. NRW commissioned survey which contributes to an NVC Saltmarsh survey collation.
 

Keywords

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
  • vegetation surveys (vegetation monitoring)(see also biologicalsurveys)
  • vegetation classification
  • Pen Llyn a'r Sarnau SAC
  • National Vegetation Classification (NVC)
  • Special Areas of Conservation (SAC) (see also Candidate Special Areas of Conservation cSAC)
  • vegetation (see also specific types eg.coastal or heathland vegetation and vegetation surveys)
  • Dyfi (Dovey)
Type
Theme

Citation

Date (Publication)
2025-01-08
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords

Keywords

SeaDataNet Parameter Discovery Vocabulary
Type
Theme

Citation

Date (Publication)
2024-06-19
Code
geonetwork.thesaurus.external.theme.rdf+xml
 

Spatial Reference System

Code
British National Grid (EPSG::27700)
 

Content

Content Information

NRW Profile

Custom Elements

NRW Related Title

Pen Llyn a'r Sarnau cSAC and adjacent areas salt marshes review and National Vegetation Classification survey 2003 : main report
 

Constraints

Constraints

Limitations on Public Access and Use

Restriction type
Other restrictions
 

Access Constraints Directive

Limitations
no limitations
 

Access Constraints Text

Other constraints

The following data is considered OS derived data and is therefore jointly owned by NRW and the Ordnance Survey. NRW may release, publish or disseminate this data freely; providing recipients are made aware of use restrictions (See general use restrictions).
 

Use Constraints

Use constraints type
Other restrictions
Other constraints

© CNC/NRW and © Crown copyright [1993]. All rights reserved. Natural Resources Wales, AC0000849444. Third parties seeking to re-use this data require a Licence issued by NRW. It allows re-use, reproduction and dissemination in any format or medium but only for non-commercial purposes, according to the terms and conditions of the Licence. Those seeking commercial re-use require a commercial licence available from the OS.
 

Attribution Statement

Other constraints

Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Contains Ordnance Survey Data. Ordnance Survey Licence number AC0000849444. Crown Copyright and Database Right
 
 
 

Metadata

Metadata

File Identifier
4f4c4942-4343-5764-6473-313039383839 XML
Metadata Language
English
Parent Identifier
Phase 2 Saltmarsh Survey of Wales

NRW_DS108800
Resource type
Dataset
Metadata Date
2026-03-03T12:00:54.788Z
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
 
 

Publishing Body

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