A method to assess the performance of SAR-derived surface soil moisture products

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dc.contributor.authorBeale, John
dc.contributor.authorWaine, Toby
dc.date.accessioned2021-05-21T10:33:46Z
dc.date.available2021-05-21T10:33:46Z
dc.date.issued2021-04-06
dc.description.abstractSynthetic aperture radar (SAR) is a remote sensing technique for mapping of soil moisture with high spatial resolution. C -band SAR can resolve features at field scale, or better, but responds to moisture only within the top 1 to 2 cm of the soil. When validating SAR-derived soil moisture products against standard in situ measurements at 5 to 10 cm depth, the greater moisture variability at the soil surface may be inaccurately categorized as measurement error. An alternative method was developed where the C -band SAR product is validated against soil moisture simulated at 2 cm depth by the HYDRUS-1D model. This reproduces soil moisture depth profiles from daily meteorological observations, leaf area index, and soil hydraulic parameters. The model was fitted at 13 COSMOS-UK sites so that the model output at 10 cm depth closely reproduced the cosmic ray neutron sensor data. At ten of the sites studied, there was an improvement of up to 8% in root-mean-squared difference by validating the Copernicus surface soil moisture (SSM) product at 2 cm compared to 10 cm. This suggests that Copernicus SSM and other C -band SAR surface soil moisture algorithms may be more accurate than have hitherto been acknowledged.en_UK
dc.identifier.citationBeale JE, Waine TW, Corstanje R, Evans JG. (2021) A method to assess the performance of SAR-derived surface soil moisture products. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Volume 14, 2021, pp. 4504-4516en_UK
dc.identifier.issn1939-1404
dc.identifier.urihttps://doi.org/10.1109/JSTARS.2021.3071380
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/16705
dc.language.isoenen_UK
dc.publisherIEEEen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectLand surfaceen_UK
dc.subjectmoisture measurementen_UK
dc.subjectremote sensingen_UK
dc.subjectsoil moistureen_UK
dc.titleA method to assess the performance of SAR-derived surface soil moisture productsen_UK
dc.typeArticleen_UK

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