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. 2022 Jan 26;12:1379. doi: 10.1038/s41598-022-05476-5

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Maps of the (a) mean topsoil SOC concentrations of all eight maps; (b) standard deviations of the mean (SD); (c) coefficient of variation values (standard deviation/mean); and (d) the signal to noise ratios (the reciprocal of the coefficient of variation i.e. mean/standard deviation). Note here that statistics were calculated after each of the 8 maps were modified to harmonise them to a common spatial extent, resolution and units of SOC concentration. Values are calculated only for those 1 km grid cells that contain data from all the topsoil SOC concentration maps. White areas indicate where there are no data for at least one of the maps, including urban areas and littoral broad habitats with little topsoil and parts of Scotland (excluded from CSGB-AIC due to the low spatial representation of CS 2007 points in montane broad habitats).