BGS Hosted Metadata
Change in saltmarsh extent for six regions across Great Britain (1846-2016)
Data are presented showing change in saltmarsh extent along 25 estuaries/embayments in six regions across Great Britain, between 1846 and 2016. Data were captured from maps and aerial photographs. Marsh extent was delineated a scale of 1:7,500 by placing vertices every 5 m along the marsh edge. Error introduced from: (i) inaccuracies in the basemap used to georeference maps and aerial photographs; (ii) the georeferencing procedure itself; (iii) the interpreter when placing vertices on the marsh edge; and (iv) map and photo distortions that occurred prior to digitisation were calculated and used to estimate the root mean square error (RMSE) in areal extent of each marsh complex. Measures of marsh extent were only recorded if maps and aerial photographs were available for the entire estuary/embayment. Data was collected as part of a study on the large-scale, long-term trends and causes of lateral saltmarsh change. The data was used in the analysis for Ladd et al. (2019). C. Ladd and M.F. Duggan-Edwards carried out the collection and processing of the saltmarsh extent data. All authors contributed to the interpretation of the data. The work was carried out under the NERC programme - Carbon Storage in Intertidal Environment (C-SIDE), NERC grant reference NE/R010846/1. Full details about this dataset can be found at https://doi.org/10.5285/03b62fd0-41e2-4355-9a06-1697117f0717
Simple
- Date (Publication)
- 2019-09-18
- Date (Creation)
- 2019-05-15
- Citation identifier
- https://catalogue.ceh.ac.uk/id/03b62fd0-41e2-4355-9a06-1697117f0717
- Citation identifier
- doi: / 10.5285/03b62fd0-41e2-4355-9a06-1697117f0717
- Other citation details
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Ladd, C.J.T., Duggan-Edwards, M.F., Bouma, T.J., Pagès, J.F., Skov, M.W. (2019). Change in saltmarsh extent for six regions across Great Britain (1846-2016). NERC Environmental Information Data Centre 10.5285/03b62fd0-41e2-4355-9a06-1697117f0717
- Point of contact
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Organisation name Individual name Electronic mail address Role Bangor University Ladd, C.
Point of contact Bangor University Ladd, C.J.T. Author Bangor University Duggan-Edwards, M.F. Author Royal Netherlands Institute for Sea Research Bouma, T.J. Author Centre d’Estudis Avançats de Blanes
Pagès, J.F. Author Bangor University Skov, M.W. Author NERC Environmental Information Data Centre Publisher NERC EDS Environmental Information Data Centre Custodian
- Maintenance and update frequency
- Not planned
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GEMET - INSPIRE themes, version 1.0
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Habitats and Biotopes
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- Access constraints
- Other restrictions
- Other constraints
- no limitations
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© Bangor University
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- Other restrictions
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© Royal Netherlands Institute for Sea Research
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- Other restrictions
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© Centre d’Estudis Avançats de Blanes
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- Other restrictions
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If you reuse this data, you should cite: Ladd, C.J.T., Duggan-Edwards, M.F., Bouma, T.J., Pagès, J.F., Skov, M.W. (2019). Change in saltmarsh extent for six regions across Great Britain (1846-2016). NERC Environmental Information Data Centre https://doi.org/10.5285/03b62fd0-41e2-4355-9a06-1697117f0717
- Spatial representation type
- Vector
- Distance
- 5 urn:ogc:def:uom:EPSG::9001
- Language
- English
- Character set
- UTF8
- Topic category
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- Biota
- Environment
- Begin date
- 1846-06-01
- End date
- 2016-05-26
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- Unique resource identifier
- OSGB 1936 / British National Grid
- Distribution format
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Name Version Shapefile
- Distributor contact
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Organisation name Individual name Electronic mail address Role NERC EDS Environmental Information Data Centre
Distributor
- OnLine resource
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Protocol Linkage Name https://data-package.ceh.ac.uk/data/03b62fd0-41e2-4355-9a06-1697117f0717 Download the data
- OnLine resource
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Protocol Linkage Name https://data-package.ceh.ac.uk/sd/03b62fd0-41e2-4355-9a06-1697117f0717.zip Supporting information
- Hierarchy level
- Dataset
- Other
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dataset
Conformance result
- Title
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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
- Date (Publication)
- 2010-12-08
- Statement
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The aerial extent change in saltmarsh extent across Great Britain came into existence by using Ordnance Survey (OS) maps and aerial photographs to delineate marsh extent for each estuary.. Marsh extent was delineated in ArcGIS 10.6 at a scale of 1:7,500 by placing vertices every 5m along the marsh edge. A Root Mean Square Error (RMSE) term (in meters) was calculated for each marsh complex by assessing error introduced by: (i) inaccuracies in the basemap used to georeference maps and aerial photographs; (ii) the georeferencing procedure itself; (iii) the interpreter when placing vertices on the marsh edge; and (iv) map and photo distortions that occurred prior to digitisation. To qualitatively assess whether the vectorised layer could be considered accurate, the most recent digitised marsh extent was compared against national marsh extent layers to ensure general agreement. Literature searches were also done to verify whether observations of significant change in marsh extent were reliable, or whether errors introduced by map surveyors on the location of the marsh edge likely explain the differences.
Metadata
- File identifier
- 03b62fd0-41e2-4355-9a06-1697117f0717 XML
- Metadata language
- English
- Character set
- 8859 Part 1
- Hierarchy level
- Dataset
- Hierarchy level name
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dataset
- Date stamp
- 2025-03-21T13:21:56
- Metadata standard name
- UK GEMINI
- Metadata standard version
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2.3
- Metadata author
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Organisation name Individual name Electronic mail address Role NERC EDS Environmental Information Data Centre Point of contact
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