Saltmarsh Change

Published by:
Environment Agency
Last updated:
12 May 2022
Topic:
Not added
Licence:
Other Licence
View licence information

Summary

Saltmarsh Change Summary: The Saltmarsh Change layer shows the recent change in saltmarsh extent across England, since a baseline survey was completed in 2006 to 2009.

Dataset Descpription: The Saltmarsh Change layer was created by comparing the 'baseline' version of Saltmarsh Extent with its 'most recent' version. The baseline version was mapped from aerial imagery, primarily collected between the 2006 and 2009. The most recent version is based on imagery between 2006 and 2019. Since the production of the baseline (in 2006-09), approximately 80% of England's saltmarsh has been remapped using later imagery. This dataset allows users to easily identify the differences between the two versions of the mapped extent, and identifies where areas of gain and loss have occurred. Each feature within the dataset contains one of the following attribute classes: • Gain • Loss • No Change • Not Remapped

Limitations & Other Guidance: The dataset does include some, but not all marsh, created at recently breached managed realignment sites. Sites such as Steart Marshes, Salt Fleet Flats Reserve and Allfleet's Marsh have been included. However, other sites such as Medmerry (Sussex coast), Greatham (Tees Estuary) and Hesketh Out Marsh (Ribble Estuary) are yet to be included. It is intended that all such sites will be included in an update to be published in spring 2021. Users should refer to the 'Year' attributes for the timing of image capture of both the 'baseline' and 'most recent' survey. Users should bear in mind that some instances of change may be a result of the seasonal differences in the timing of image capture. The month of image capture of any feature can be identified using the attribute table.

Further Information: The dataset provides valuable evidence of where saltmarsh is accreting and eroding across the whole of England, which is vital for flood and coastal risk management, and for ecological monitoring and reporting. Saltmarsh extent has been interpreted (using a consistent technique) from aerial imagery, primarily collected through the Regional Coastal Monitoring Programmes, and other estuarine and coastal strategy monitoring programmes. The demarcation of the landward extent is aimed to be the point at which the upper most zones give way to terrestrial plants (often at the foot of a seawall), and where saltmarsh plants become ≤5% of the predominantly terrestrial community. At the seaward end, the final demarcation is aimed to be where the saltmarsh vegetation cover has become so sparse it only represents <5% of the ground cover. Mapped extents have been ground-truthed using data collected by the Environment Agency and Natural England. Attribution statement: © Environment Agency copyright and/or database right 2015. All rights reserved.

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Data links

Link to the data Format File added Data preview
Saltmarsh_Change_ESRI_REST_Feature_Server_Endpoint N/A 12 May 2022 Not available
DSP_CUSTOMER_FORUM N/A 12 May 2022 Not available
Saltmarsh_Change_download N/A 12 May 2022 Not available
Saltmarsh_Change_ESRI_REST_Endpoint N/A 12 May 2022 Not available
Saltmarsh_Change_WFS N/A 12 May 2022 Not available
Saltmarsh_Change_WMS N/A 12 May 2022 Not available

Additional information

View additional metadata
Added to data.gov.uk
2020-10-23
Access contraints
There are no public access constraints to this data. Use of this data is subject to the licence identified.
Harvest GUID
3e8c1f71-0938-442c-ad77-b708f01830f1
Extent
Latitude: 55.816° to 49.943°
Longitude: -6.236° to 2.072°
Spatial reference system
http://www.opengis.net/def/crs/EPSG/0/27700
Dataset reference date
2020-06-02 (creation)
2020-06-02 (revision)
Frequency of update
asNeeded
Responsible party
Environment Agency (pointOfContact)
ISO 19139 resource type
dataset
Metadata language
eng
Source Metadata
XML
HTML

Contact

Enquiries

https://support.environment.data.gov.uk/hc/en-gb

Freedom of Information (FOI) requests

National Customer Contact Centre Freedom of information requests for this dataset

Licence information

Open Government Licence