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Saltmarsh Extent - What Is The Time Period Of The Map, As It Would Be Useful To Have The Correct Baseline Period?
Created: 03 September 2020 Updated: 28 June 2023
The primary time period of aerial imagery capture from which the saltmarsh extent is derived, is mainly 2016-2019. However, some small areas were collected after this time (2 water bodies captured in 2020). In the attribute table, the ‘YEAR’ field indicates the timing of the photo capture for each feature.
The original baseline publication of this data included data from 2006-09, but large areas have been remapped since, and the downloadable version you can access now (published in March 2023) is from 2016-2019.
Alongside the Saltmarsh Extent and Zonation layer, the Environment Agency now publish a product showing Saltmarsh Change, which compares the baseline (2006-09) version 1_08 against the most recent extent (2016-19) Version 4_09. The Saltmarsh Change layer shows areas of recent accretion and erosion. Almost 100% of the national extent has been remapped (just 0.02% has not been remapped). This data is available from DEFRA DSP to download.