{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,26]],"date-time":"2026-03-26T19:45:36Z","timestamp":1774554336798,"version":"3.50.1"},"reference-count":89,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2024,1,5]],"date-time":"2024-01-05T00:00:00Z","timestamp":1704412800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001602","name":"Science Foundation Ireland","doi-asserted-by":"publisher","award":["16\/RC\/3835"],"award-info":[{"award-number":["16\/RC\/3835"]}],"id":[{"id":"10.13039\/501100001602","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Soil moisture is important for understanding climate, water resources, water storage, and land use management. This study used Sentinel-2 (S-2) satellite optical data to retrieve surface soil moisture at a 10 m scale on grassland sites with low hydraulic conductivity soil in a climate dominated by heavy rainfall. Soil moisture was estimated after modifying the Optical Trapezoidal Model to account for mixed land cover in such conditions. The method uses data from a short-wave infra-red band, which is sensitive to soil moisture, and four vegetation indices from optical bands, which are sensitive to overlying vegetation. Scatter plots of these data from multiple, infrequent satellite passes are used to define the range of surface moisture conditions. The saturated and dry edges are clearly non-linear, regardless of the choice of vegetation index. Land cover masks are used to generate scatter plots from data only over grassland sites. The Enhanced Vegetation Index demonstrated advantages over other vegetation indices for surface moisture estimation over the entire range of grassland conditions. In poorly drained soils, the time lag between satellite surface moisture retrievals and in situ sensor soil moisture at depth must be part of the validation process. This was achieved by combining an approximate solution to the Richards\u2019 Equation, along with measurements of saturated and residual moisture from soil samples, to optimise the correlations between measurements from satellites and sensors at a 15 cm depth. Time lags of 2\u20134 days resulted in a reduction of the root mean square errors between volumetric soil moisture predicted from S-2 data and that measured by in situ sensors, from ~0.1 m3\/m3 to &lt;0.06 m3\/m3. The surface moisture results for two grassland sites were analysed using statistical concepts based upon the temporal stability of soil water content, an ideal framework for the intermittent Sentinel-2 data in conditions of persistent cloud cover. The analysis could discriminate between different natural drainages and surface soil textures in grassland areas and could identify sub-surface artificial drainage channels. The techniques are transferable for land-use and agricultural management in diverse environmental conditions without the need for extensive and expensive in situ sensor networks.<\/jats:p>","DOI":"10.3390\/rs16020220","type":"journal-article","created":{"date-parts":[[2024,1,5]],"date-time":"2024-01-05T07:38:31Z","timestamp":1704440311000},"page":"220","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Temporal Stability of Grassland Soil Moisture Utilising Sentinel-2 Satellites and Sparse Ground-Based Sensor Networks"],"prefix":"10.3390","volume":"16","author":[{"given":"Rumia","family":"Basu","sequence":"first","affiliation":[{"name":"VistaMilk, Teagasc Moorepark, P61 C996 Fermoy, Ireland"},{"name":"Earth and Ocean Sciences, Ryan Institute, College of Science and Engineering, University of Galway, H91 TK33 Galway, Ireland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4223-5129","authenticated-orcid":false,"given":"Eve","family":"Daly","sequence":"additional","affiliation":[{"name":"Earth and Ocean Sciences, Ryan Institute, College of Science and Engineering, University of Galway, H91 TK33 Galway, Ireland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0501-0836","authenticated-orcid":false,"given":"Colin","family":"Brown","sequence":"additional","affiliation":[{"name":"Earth and Ocean Sciences, Ryan Institute, College of Science and Engineering, University of Galway, H91 TK33 Galway, Ireland"}]},{"given":"Asaf","family":"Shnel","sequence":"additional","affiliation":[{"name":"VistaMilk, Teagasc Moorepark, P61 C996 Fermoy, Ireland"}]},{"given":"Patrick","family":"Tuohy","sequence":"additional","affiliation":[{"name":"VistaMilk, Teagasc Moorepark, P61 C996 Fermoy, Ireland"}]}],"member":"1968","published-online":{"date-parts":[[2024,1,5]]},"reference":[{"key":"ref_1","unstructured":"(2022, October 20). 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