Welsh Lakes Bathymetry Data
Data Bathymetreg Llynnoedd Cymru

  • English
  • wel
  • All

Bathymetric data from Welsh lakes collated from documentary and electronic sources and re-formatted into a consistent and accessible form and structure.


The data includes transformed raw coordinate and depth data to bathymetric surface rasters at 0.5 m interval polygon shapefiles that can be placed into GIS software with volume/depth and area/depth data for the lakes at the same 0.5 m interval.


The data supplied collates existing bathymetric data to produce a series of GIS layers that display detailed bathymetric maps of Welsh lakes.

Data bathymetrig o lynnoedd Cymru wedi'i goladu o ffynonellau dogfennol ac electronig a'i ail-fformatio i ffurf a strwythur cyson a hygyrch. Mae'r data'n cynnwys data cyfesurynnau a dyfnder crai wedi'i drawsnewid i rastrau arwyneb bathymetrig ar ffurf ffeiliau siâp polygon â chyfwng o 0.5m y gellir eu gosod mewn meddalwedd GIS gyda data cyfaint/dyfnder ac arwynebedd/dyfnder ar gyfer y llynnoedd ar yr un cyfwng o 0.5m. Mae'r data a gyflenwir yn coladu data bathymetrig presennol i gynhyrchu haenau GIS sy'n dangos mapiau bathymetrig manwl o holl lynnoedd Cymru.


Casglwyd data o ffynonellau o 1902 ymlaen. Cynhaliwyd gwaith safoni a dadansoddi ystadegol yn 2010. Cafwyd y mesuriadau dyfnder gan ddefnyddio seinydd adlais llaw a systemau ar gychod; cafwyd y lleoliadau daearyddol o fapiau cyfuchliniau llynnoedd gwreiddiol, lleoliadau daearyddol bras ac unedau GPS llaw i gael cyfeirnodau grid cywir. Mae’r hyder yn y set ddata hon yn uchel gan i’r data gael ei goladu a’i ddadansoddi gan weithwyr proffesiynol amgylcheddol profiadol; fodd bynnag, ar gyfer llawer o’r llynnoedd gall y data crai fod yn amherffaith a dylid bod yn ofalus. Mewn rhai achosion nid oes gwybodaeth bathymetrig ar gael (e.e., Llyn Bodlyn, Llyn Ogwen, Llyn Hesgin, Llyn Du) ac mae'r wybodaeth hon ar gael fel data ar gyfer mannau penodol yn unig.


Datganiad priodoli


Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Centre for Ecology & Hydrology © UKRI (CEH). © ENSIS-ECRC, University College London

Identification

Dynodydd
Identifier
NRW_DS102203
Teitl Amgen
Alternative Title
  • Welsh lakes bathymetry.LYR
  • Standardised Bathymetric Data Generation and Statistical Analysis of Welsh Lakes
  • Data Bathymetrig o Lynnoedd Cymru Cynhyrchu Data Bathymetrig Safonedig Dadansoddiad Ystadegol o Lynnoedd Cymru
Laith Metadata
Metadata Language
English
Lineage
Datganiad

Data was collated from sources from 1902 onwards. Standardisation and statistical analysis was undertaken in 2010. Depth measurements obtained using hand held echo sounder and boat mounted systems, geographic locations obtained from original contour lake maps, approximate geographical locations and handheld GPS units to obtain accurate grid references. The confidence in this dataset is high as data collated and analysed by experienced environmental professionals however for many of the lakes the raw data may be imperfect and should be treated with caution.


In some cases no bathymetric information is available (e.g. Llyn Bodlyn, Llyn Ogwen, Llyn Hesgin, Llyn Bodlyn, Llyn Du) and this information is available as spot data only.


INFORMATION WARNING: This data should not be used for navigation purposes.

Casglwyd data o ffynonellau o 1902 ymlaen. Cynhaliwyd gwaith safoni a dadansoddi ystadegol yn 2010. Cafwyd y mesuriadau dyfnder gan ddefnyddio seinydd adlais llaw a systemau ar gychod; cafwyd y lleoliadau daearyddol o fapiau cyfuchliniau llynnoedd gwreiddiol, lleoliadau daearyddol bras ac unedau GPS llaw i gael cyfeirnodau grid cywir. Mae’r hyder yn y set ddata hon yn uchel gan i’r data gael ei goladu a’i ddadansoddi gan weithwyr proffesiynol amgylcheddol profiadol; fodd bynnag, ar gyfer llawer o’r llynnoedd gall y data crai fod yn amherffaith a dylid bod yn ofalus. Mewn rhai achosion nid oes gwybodaeth bathymetrig ar gael (e.e., Llyn Bodlyn, Llyn Ogwen, Llyn Hesgin, Llyn Du) ac mae'r wybodaeth hon ar gael fel data ar gyfer mannau penodol yn unig.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2024-04-02
Perchennog
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Ensis Ltd -
UCL (University College London) Pearson Building, Gower Street, London, WC1E 6BT, England
http://www.ensis.ucl.ac.uk/
 

Extent

Extent

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


 
 

Distribution

Dosbarthiad
Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • Geographic Information System ( Unknown )

    Specification

    [A] The final report in Microsoft Word and Adobe PDF formats. [B] A series of GIS layers in ArcGis format (shp file). The archive consists of a folder for each lake containing the individual depth layers, plus a layer for all depth data [C] A series of GIS layers in MapInfo format (tab file) created by CCW. The archive consists of a folder for each lake containing the layer with all depth data, an outline of the lake and the transect points (xyz) at which data was collected. A single amalgamated layer for all lakes is also provided [D] A set of PDF files of the depth maps and depth-volume and hypsographic curves

Lleolwr Adnoddau
Resource Locator
Download Data & Web Services ( WWW:LINK-1.0-http--link )
Lleolwr Adnoddau
Resource Locator
Web Mapping Service ( OGC:WMS )
 

Quality

Ansawdd Data
Data quality

Cwmpas Ansawdd
Quality Scope
Dataset
Dataset
Cydymffurfiad
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
Datganiad

Data was collated from sources from 1902 onwards. Standardisation and statistical analysis was undertaken in 2010. Depth measurements obtained using hand held echo sounder and boat mounted systems, geographic locations obtained from original contour lake maps, approximate geographical locations and handheld GPS units to obtain accurate grid references. The confidence in this dataset is high as data collated and analysed by experienced environmental professionals however for many of the lakes the raw data may be imperfect and should be treated with caution.


In some cases no bathymetric information is available (e.g. Llyn Bodlyn, Llyn Ogwen, Llyn Hesgin, Llyn Bodlyn, Llyn Du) and this information is available as spot data only.


INFORMATION WARNING: This data should not be used for navigation purposes.

Casglwyd data o ffynonellau o 1902 ymlaen. Cynhaliwyd gwaith safoni a dadansoddi ystadegol yn 2010. Cafwyd y mesuriadau dyfnder gan ddefnyddio seinydd adlais llaw a systemau ar gychod; cafwyd y lleoliadau daearyddol o fapiau cyfuchliniau llynnoedd gwreiddiol, lleoliadau daearyddol bras ac unedau GPS llaw i gael cyfeirnodau grid cywir. Mae’r hyder yn y set ddata hon yn uchel gan i’r data gael ei goladu a’i ddadansoddi gan weithwyr proffesiynol amgylcheddol profiadol; fodd bynnag, ar gyfer llawer o’r llynnoedd gall y data crai fod yn amherffaith a dylid bod yn ofalus. Mewn rhai achosion nid oes gwybodaeth bathymetrig ar gael (e.e., Llyn Bodlyn, Llyn Ogwen, Llyn Hesgin, Llyn Du) ac mae'r wybodaeth hon ar gael fel data ar gyfer mannau penodol yn unig.
 

Keywords

Allweddair
Keywords

GEMET - INSPIRE themes, version 1.0
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Allweddair
Keywords

NRW Thesaurus
  • bathymetry
  • Lakes (Limnology)
  • lake classification
  • Bathymetric survey
Math
Type
Theme
Theme

Dyfyniad
Citation

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

Spatial Reference System

Code
British National Grid (EPSG::27700)
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

 

Constraints

Constraints

Limitations on Public Access and Use

Math o Gyfyngiad
Restriction type
Other restrictions
Other restrictions
 

Access Constraints Directive

Limitations
no limitations
 

Access Constraints Text

Other constraints

There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
 

Use Constraints

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
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.
 

Attribution Statement

Other constraints

Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Centre for Ecology & Hydrology © UKRI (CEH). © ENSIS-ECRC, University College London.
 

Licence

Other constraints
Open Government Licence
 
 
 

Metadata

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313032323033 XML
Laith Metadata
Metadata Language
English
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2025-12-01T16:39:45.629Z
Enw Safonol Metadata
Metadata Standard Name
NRW
Fersiwn Metadata
Metadata Standard Version

1.0

Pwynt Cyswllt
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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