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Change in saltmarsh extent for six regions across Great Britain (1846-2016)

Published by:
Environmental Information Data Centre
Last updated:
21 January 2026
Topic:
Not added
Licence:
None

Summary

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

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Additional information

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Added to data.gov.uk
2025-11-13
Access contraints
© Bangor University
Harvest GUID
03b62fd0-41e2-4355-9a06-1697117f0717
Extent
Latitude: 55.298° to °
Longitude: -5.747° to 2.032°
Spatial reference system
Dataset reference date
2019-09-18 (publication)
2019-05-15 (creation)
Frequency of update
notPlanned
Responsible party
(pointOfContact, author, publisher, custodian); Centre d’Estudis Avançats de Blanes (author)
ISO 19139 resource type
dataset
Metadata language
eng
Source Metadata
XML
HTML

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