Gweunydd Nant y Twyn SSSI - National Vegetation Classification (NVC) Grassland Survey (2024)
A standard Phase 2 NVC survey was undertaken at Gweunydd Nant y Twyn as part of the Site of Special Scientific Interest (SSSI) designation process.
Gweunydd Nant y Twyn consists of a cluster of small fields, with tall, wooded hedgerows. The site is of particular importance for bryophytes.
The site comprises the original Phase 2 site survey site of Mockridge et al. 1998, which has now been resurveyed (2024) and extended to include several contiguous small fields, and a further extension centred on 5 small nearby fields, approximately 1/3rd of a km to the north, linked by a block of woodland and pasture. The total area of the Phase 2 survey site is now 39.9ha.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS161349
- Alternative Title
-
- Metadata Language
- English
- Lineage
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Standard National Vegetation Classification (NVC) survey techniques were used. The survey was carried out in-house by Natural Resources Wales (NRW) staff.
Note, the Phase 2 survey site boundary does not coincide with the Gweunydd Nant y Twyn SSSI boundary, which excludes certain fields of more modified grassland.
Gweunydd Nant y Twyn GIS data has been added to the Phase 2 Lowland Grassland Survey. One of the files contains sensitive species but this has been redacted before being published.
- Additional Information
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Westwood, S. & Bosanquet, S. 2025. NRW Lowland Grassland Survey and Site Description of ST 19/17 Gweunydd Nant y Twyn Revisit and New Annex. NRW Report No: 864, 25pp, Natural Resources Wales, Cardiff.
- Dataset Reference Date (Creation)
- 2025-03-06
- Dataset Reference Date (Publication)
- 2025-09-23
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Distribution
Distribution
- Format Type and Description
-
-
Documents
(
Unknown
)
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Geographic Information System
(
Unknown
)
-
Image
(
Unknown
)
-
Documents
(
Unknown
)
- Resource Locator
- Download Data & Web Services ( WWW:LINK-1.0-http--link )
- Resource Locator
- Web Mapping Service ( OGC:WMS )
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
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This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Degree
- false
- Lineage
-
Standard National Vegetation Classification (NVC) survey techniques were used. The survey was carried out in-house by Natural Resources Wales (NRW) staff.
Note, the Phase 2 survey site boundary does not coincide with the Gweunydd Nant y Twyn SSSI boundary, which excludes certain fields of more modified grassland.
Gweunydd Nant y Twyn GIS data has been added to the Phase 2 Lowland Grassland Survey. One of the files contains sensitive species but this has been redacted before being published.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
-
NRW Thesaurus
-
- lowland grassland
- National Vegetation Classification (NVC)
- SSSI (Sites of Special Scientific Interest)
- Phase 2 Survey (Phase II)
- Type
- Theme
Citation
- Date (Publication)
- 2026-03-04
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
- noLimitations
Access Constraints Text
- Other constraints
-
Part of this dataset is sensitive, and access may be restricted under relevant legislation. NRW may NOT publish or disseminate the sensitive data. Requests should be referred to NRW's Access to Information Officer. However, there are no access restrictions on non-sensitive data. NRW may release, publish or disseminate a redacted version of the data freely.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© CNC/NRW All rights Reserved. Contains Ordnance Survey Data. Ordnance Survey Licence number AC0000849444. Crown Copyright and Database Right. NRW does NOT grant permission to third parties to re-use or disseminate the full dataset. A redacted version of the 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.
Attribution Statement
- Other constraints
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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.
Licence
- Other constraints
- Open Government Licence
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313631333439 XML
- Metadata Language
- English
- Parent Identifier
-
Phase 2 Lowland Grassland Survey of Wales
NRW_DS46160
- Resource type
- Dataset
- Metadata Date
- 2026-04-22T15:21:56.26Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0