Digital Elevation Model (DEM) data for the Conwy estuary, Wales

The Digital Elevation Model (DEM) domain includes the tidally influenced Conwy estuary, downstream of the Cwmlanerch river gauge on the River Conwy and extending offshore into Conwy Bay and the Menai Strait at the coastal boundary. A number of sources were combined to generate the land elevation data, including (a) seabed bathymetry, (b) land elevations and (c) location and heights of existing flood defences. The domain topography was based on the marine DEM, Lidar Digital Terrain Model (DTM) and Ordnance Survey Terrain 5m DTM. The Lidar DTM data was used to check and, where necessary, augment the flood defences vector database. Full details about this dataset can be found at https://doi.org/10.5285/7217e6c0-46c7-4f87-bc36-589f884d3b02

Simple

Date (Publication)
2024-01-15
Identifier
https://catalogue.ceh.ac.uk/id/7217e6c0-46c7-4f87-bc36-589f884d3b02
Identifier
doi: / 10.5285/7217e6c0-46c7-4f87-bc36-589f884d3b02
Other citation details
Vasilopoulos, G., Robins, P.E., Chien, N. (2024). Digital Elevation Model (DEM) data for the Conwy estuary, Wales. NERC EDS Environmental Information Data Centre 10.5285/7217e6c0-46c7-4f87-bc36-589f884d3b02
Point of contact
  Bangor University - Robins, P.E.
https://orcid.org/0000-0001-9503-9845
Author
  University of Hull - Vasilopoulos, G.
Author
  Bangor University - Robins, P.E.
https://orcid.org/0000-0001-9503-9845
Author
  University of Edinburgh - Chien, N.
Publisher
  NERC EDS Environmental Information Data Centre
Custodian
  NERC EDS Environmental Information Data Centre
Owner
  Bangor University
GEMET - INSPIRE themes, version 1.0
  • Elevation
Access constraints
otherRestrictions Other restrictions
Other constraints
no limitations
Use constraints
otherRestrictions Other restrictions
Other constraints
This resource is available under the terms of the Open Government Licence
Use constraints
otherRestrictions Other restrictions
Other constraints
If you reuse this data, you should cite: Vasilopoulos, G., Robins, P.E., Chien, N. (2024). Digital Elevation Model (DEM) data for the Conwy estuary, Wales. NERC EDS Environmental Information Data Centre https://doi.org/10.5285/7217e6c0-46c7-4f87-bc36-589f884d3b02
Spatial representation type
grid Grid
Distance
20  urn:ogc:def:uom:EPSG::9001
Metadata language
EnglishEnglish
Character set
utf8 UTF8
Topic category
  • Elevation
N
S
E
W
thumbnail


Unique resource identifier
OSGB 1936 / British National Grid
Distribution format
  • ASCII ()

Distributor
  NERC EDS Environmental Information Data Centre
OnLine resource
Download the data

Download a copy of this data

OnLine resource
Supporting information

Supporting information available to assist in re-use of this dataset

Hierarchy level
dataset Dataset
Other
dataset

Conformance result

Date (Publication)
2010-12-08
Statement
a) Seabed bathymetry for the Menai Strait, Conwy Bay and the mouth of the Conwy estuary extending upstream to the Conwy Bridge were obtained from marine Digital Elevation Models (DEMs) distributed by OceanWise and made available through Digimap. These marine DEMs consist of bed elevations measured with single- and multibeam sonar sensors and converted into raster tiles of 1 arc second horizontal resolution. They are referenced to the WGS 1984 coordinate system and the recorded bathymetry is referenced to the local Chart Datum at Llandudno. b) The majority of land elevations for this catchment (73%) have been surveyed by Natural Resources Wales (NRW) using Light Detection and Ranging (Lidar) technology through a series of aerial surveys spanning multiple years (2016-2020). The composite-derived Digital Terrain and Surface Models (DTMs and DSMs, respectively) were obtained from Digimap. The raster tiles have 1 m resolution, are projected to the British National Grid and the elevations are referenced to the national Ordnance Survey vertical datum at Newlyn. The difference between DTMs and DSMs is that the former represents earth terrain and as such has all ‘above-surface’ features (e.g. vegetation, human-made structures) removed, which are included in the latter. Elevation data for the remaining land areas not covered by the Lidar-based composites (27%) were extracted from the Ordnance Survey Terrain 5 m DTM also available through Digimap. This lower-resolution dataset has national coverage and consists of elevation data obtained from multiple sources including airborne Lidar, photogrammetry and field surveys. The data are provided as raster tiles of 5 m resolution projected to the British National Grid with elevations referenced to the national Ordnance Survey vertical datum at Newlyn. c) Locations and heights of flood defences were obtained from the NRW data catalogue. These data consist of vector shapefiles projected to the British National Grid with polylines detailing the location of flood defences including information on the type of defence (e.g. wall, embankment) and the height of the crest above the terrain in metres. All spatial data outlined above were imported into ArcGIS Pro 3.0 and processed to generate the DEM. Individual raster files pertaining to the various datasets outlined above were mosaiced into a single raster tile and resampled to 5 m resolution using a bilinear interpolation method.
File identifier
7217e6c0-46c7-4f87-bc36-589f884d3b02 XML
Metadata language
EnglishEnglish
Character set
ISO/IEC 8859-1 (also known as Latin 1) 8859 Part 1
Hierarchy level
dataset Dataset
Hierarchy level name
dataset
Date stamp
2025-11-05T08:36:27
Metadata standard name
UK GEMINI
Metadata standard version
2.3
Point of contact
  NERC EDS Environmental Information Data Centre
Lancaster Environment Centre, Library Avenue, Bailrigg , Lancaster , LA1 4AP , UK
https://eidc.ac.uk/
 
 

Overviews

Spatial extent

N
S
E
W
thumbnail


Keywords

GEMET - INSPIRE themes, version 1.0
Elevation

Provided by

Share on social sites

Access to the portal

Associated resources

Not available