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Metadata: Marine SAC Freshwater Catchments Requiring Nitrogen Neutrality
Abstract:
The Marine SAC Freshwater Catchments Requiring Nitrogen Neutrality layer is a subset of the Nutrient Sensitive Marine SAC Freshwater Catchments layer. It only shows the three freshwater catchments that require nitrogen neutrality based on NRW’s advice letter of 25th July 2025 and maybe subject to future changes. Please also see metadata entry NRW_DS161370 "Nutrient Sensitive Marine SAC Freshwater Catchments".
Data holder:
Natural Resources Wales (NRW)
| Other details | ||
| Internal code | Internally assigned metadata identifier | 8878 |
| Title | The title is used to provide a brief and precise description of the dataset such as 'Date', 'Originating organisation/programme', 'Location' and 'Type of survey'. All acronyms and abbreviations should be reproduced in full. | Marine SAC Freshwater Catchments Requiring Nitrogen Neutrality |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | Marine SAC freshwater catchments requiring nitrogen neutrality.lyr |
| File Identifier | The File Identifier is a code, preferably a GUID, that is globally unique and remains with the same metadata record even if the record is edited or transferred between portals or tools. | NRW_DS161371 |
| Resource Identifier | This is the code assigned by the data owner. | 4f4c4942-4343-5764-6473-313631333731 |
| Resource type | The resource type will likely be a dataset but could also be a series (collection of datasets with a common specification) or a service. | dataset |
| Start date | This describes the date the resource starts. This may only be the year if month and day are not known | 2025-01-16 |
| Frequency of updates | This describes the frequency with which the resource is modified or updated i.e. a monitoring programme that samples once per year has a frequency that is described as 'annually'. | asNeeded |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | The Marine SAC Freshwater Catchments Requiring Nitrogen Neutrality layer is a subset of the Nutrient Sensitive Marine SAC Freshwater Catchments layer. It only shows the three freshwater catchments that require nitrogen neutrality based on NRW’s advice letter of 25th July 2025 and maybe subject to future changes. Please also see metadata entry NRW_DS161370 "Nutrient Sensitive Marine SAC Freshwater Catchments". |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | The Nutrient sensitive Marine SAC freshwater catchments layer has been created in QGIS largely using the PCRaster toolset. Data sources from DataMapWales: - ‘LIDAR data download’ - comprising Welsh Government LIDAR 2020-2023 - ‘Wales Boundary’ (High Water Mark), - ‘Wales National Marine Plan Boundary’ - (Normal Tidal Limit) - ‘SACs’ - ‘WFD Cycle 2 TraC Waterbodies’. All Open Government Data sources. Data Processing: (QGIS largely using PCRaster toolset) - Native resolution LIDAR Digital Terrain Model (DTM) geotiff data was resampled at 10m x 10m resolution. - DTM converted to PC raster format. - DTM clipped to High Water using Wales (High Water Mark) polygon. - DEM converted to Local Drain Direction (LDD) raster having filled pits in DTM (using ‘LDDcreate’ tool for both tasks) - LDD raster processed (using ‘pit’ tool) to identify drainage outlets to the DTM boundary, creating an ‘outlets’ raster. - LDD and Outlets rasters processed (using ‘catchments’ tool) to create upstream catchments flowing to the outlet points, one for each outlet. Created ‘catchments’ raster. - Converted Catchments raster to vector format. Tidying up and adding data attributes: - The Catchments vector layer was clipped using the National Marine Plan boundary (Normal Tidal Limits) to better represent the land/sea interface and create a closer match with WFD Transitional water body boundaries. - Catchment polygons were assigned values representing the SAC and WFD Transitional or Coastal waterbody they flowed into, or could directly affect (i.e. where adjacent) – created using the SAC and WFD Cycle 2 WB layers. Adjustment for Marine SAC nutrient use: - Catchments (polygons) with common combined Waterbody and SAC values were merged. Where there was an obvious deviation between the freshwater catchment vector layer and the existing WFD river catchment layer, resulting from man-made interventions viewable on the map data, the freshwater catchment boundary was adjusted to align with the WFD river catchment water body boundary. |
| Additional information | This describes relevant references to the data e.g. reports, articles, websites plus other useful information not captured elsewhere. | Marine SAC condition assessments published on NRW website: https://www.naturalresources.wales/guidance-and-advice/environmental-topics/wildlife-and-biodiversity/protected-areas-of-land-and-seas/condition-assessments-for-welsh-european-marine-sites-ems/?lang=en |
| Related keywords | ||
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Protected sites |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Area management/restriction/regulation zones and reporting units | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Environmental monitoring facilities | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Utility and governmental services | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | protected sites | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | MARINE | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | FRESHWATER | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Special Areas of Conservation (SAC) (see also Candidate Special Areas of Conservation cSAC) | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Unspecified | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 53.427 |
| East | The eastern-most limit of the data resource in decimal degrees | -2.647 |
| South | The southern-most limit of the data resource in decimal degrees | 51.384 |
| West | The western-most limit of the data resource in decimal degrees | -5.311 |
| Regional sea | Wales (WLS) | |
| Responsible organisations | ||
| Role | The point of contact is person or organisation with responsibility for the creation and maintenance of the metadata for the resource. | pointOfContact |
| Organisation name | Natural Resources Wales | |
| Delivery point | Maes y Ffynnon | |
| Postal code | LL57 2DW | |
| City | Bangor | |
| Country | Wales | |
| opendata@cyfoethnaturiolcymru.gov.uk | ||
| Role | The custodian is the person or organisation that accepts responsibility for the resource and ensures appropriate care and maintenance. If a dataset has been lodged with a Data Archive Centre for maintenance then this organisation is be entered here. | custodian |
| Organisation name | Natural Resources Wales (NRW) | |
| Delivery point | Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales | |
| enquiries@naturalresourceswales.gov.uk | ||
| URL | http://naturalresources.wales/?lang=en | |
| Role | The owner is the person or organisation that owns the resource. | owner |
| Organisation name | Natural Resources Wales (NRW) | |
| Delivery point | Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales | |
| enquiries@naturalresourceswales.gov.uk | ||
| URL | http://naturalresources.wales/?lang=en | |
| Role | The distributor is the person or organisation that distributes the resource. | distributor |
| Organisation name | Natural Resources Wales (NRW) | |
| Delivery point | Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales | |
| enquiries@naturalresourceswales.gov.uk | ||
| URL | http://naturalresources.wales/?lang=en | |
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Natural Resources Wales (NRW) | |
| Delivery point | Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales | |
| enquiries@naturalresourceswales.gov.uk | ||
| URL | http://naturalresources.wales/?lang=en | |
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://datamap.gov.wales/layers/geonode:nrw_marice_sac_req_nit_neut |
| Locator name | Name of the web resource | Download Data & Web Services |
| Locator function | Code that describes the function of the resource. ISO function code chosen from ISO 19115-1 Codelist | information |
| Locator URL | Web address (URL) that links to the resource | https://datamap.gov.wales/capabilities/layer/7750/?ows_service=wms |
| Locator name | Name of the web resource | Web Mapping Service |
| Locator function | Code that describes the function of the resource. ISO function code chosen from ISO 19115-1 Codelist | information |
| Dataset constraints | ||
| 20.1 Limitations on Public Access - Access constraints | This states `otherRestrictions` from ISO vocabulary RestrictionCode and is an INSPIRE/GEMINI requirement. | otherRestrictions |
| 20.2 Limitations on Public Access - Other constraints | This states any limitations on access to the data. Multiple occurences are allowed here. One entry shall be from the INSPIRE Metadata registry and the other free text should be part of the resource `Have specific limitations`. | There are no access restrictions on this data. NRW may release, publish or disseminate it freely. |
| noLimitations | ||
| 21.1 Conditions for Access and Use - Use constraints | This states `otherRestrictions` from ISO vocabulary RestrictionCode and is an INSPIRE/GEMINI requirement. | otherRestrictions |
| 21.2 Conditions for Access and Use - Other constraints | This states any constraints on use of the data. Multiple conditions can be recorded for different parts of the data resource. If no conditions apply, then `No condtions apply` is recorded. This uses free text. | © CNC/NRW All rights Reserved. Contains Ordnance Survey Data. Ordnance Survey Licence number AC0000849444. Crown Copyright and Database Right. Crown Copyright: Welsh Government. Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and copyright of the owners. It is the recipient's responsibility to ensure the data is fit for the intended purpose. |
| This states any constraints on use of the data. Multiple conditions can be recorded for different parts of the data resource. If no conditions apply, then `No condtions apply` is recorded. This uses free text. | Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights reserved. © Crown Copyright and Database Rights. Ordnance Survey Licence number AC0000849444, © Crown Copyright: Welsh Government. | |
| https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ | ||
| Available data formats | ||
| Data format | Format in which digital data can be provided for transfer | Geographic Information System |
| Version info | ||
| Date of publication | The publication date of the resource or if previously unpublished the date that the resource was made publicly available via the MEDIN network. | 2025-09-08 |
| Date of creation | The date that the resource was created. | 2025-07-31 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-04-19 |
| Metadata date | The date when the content of this metadata record was last updated. | 2026-03-03 |
| Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN |
| Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | 3.1.2 |