{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T22:44:14Z","timestamp":1760222654062,"version":"build-2065373602"},"reference-count":28,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2011,12,2]],"date-time":"2011-12-02T00:00:00Z","timestamp":1322784000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The SMOS satellite mission, launched in 2009, allows global soil moisture estimations to be made using the L-band Microwave Emission of the Biosphere (L-MEB) model, which simulates the L-band microwave emissions produced by the soil\u2013vegetation layer. This model was calibrated using various sources of in situ and airborne data. In the present study, we propose to evaluate the L-MEB model on the basis of a large set of airborne data, recorded by the CAROLS radiometer during the course of 20 flights made over South West France (the SMOSMANIA site), and supported by simultaneous soil moisture measurements, made in 2009 and 2010. In terms of volumetric soil moisture, the retrieval accuracy achieved with the L-MEB model, with two default roughness parameters, ranges between 8% and 13%. Local calibrations of the roughness parameter, using data from the 2009 flights for different areas of the site, allowed an accuracy of approximately 5.3% to be achieved with the 2010 CAROLS data. Simultaneously we estimated the vegetation optical thickness (t) and we showed that, when roughness is locally adjusted, MODIS NDVI values are correlated (R2 = 0.36) to t. Finally, as a consequence of the significant influence of the roughness parameter on the estimated absolute values of soil moisture, we propose to evaluate the relative variability of the soil moisture, using a default soil roughness parameter. The soil moisture variations are estimated with an uncertainty of approximately 6%.<\/jats:p>","DOI":"10.3390\/rs3122591","type":"journal-article","created":{"date-parts":[[2011,12,3]],"date-time":"2011-12-03T12:47:52Z","timestamp":1322916472000},"page":"2591-2604","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Soil Moisture Estimations Based on Airborne CAROLS L-Band Microwave Data"],"prefix":"10.3390","volume":"3","author":[{"given":"Micka\u00ebl","family":"Pard\u00e9","sequence":"first","affiliation":[{"name":"LATMOS, Route de Troux, 78280 Guyancourt, France"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6141-8222","authenticated-orcid":false,"given":"Mehrez","family":"Zribi","sequence":"additional","affiliation":[{"name":"CESBIO (UPS\/CNRS\/IRD\/CNES), 18 Avenue Edouard Belin, bpi 2801, 31401 Toulouse Cedex 9, France"}]},{"given":"Jean-Pierre","family":"Wigneron","sequence":"additional","affiliation":[{"name":"INRA, EPHYSE, 71 Avenue Edouard Bourlaux, 33140 Villenave d\u2019Ornon, France"}]},{"given":"Monique","family":"Dechambre","sequence":"additional","affiliation":[{"name":"LATMOS, Route de Troux, 78280 Guyancourt, France"}]},{"given":"Pascal","family":"Fanise","sequence":"additional","affiliation":[{"name":"CESBIO (UPS\/CNRS\/IRD\/CNES), 18 Avenue Edouard Belin, bpi 2801, 31401 Toulouse Cedex 9, France"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6352-1717","authenticated-orcid":false,"given":"Yann","family":"Kerr","sequence":"additional","affiliation":[{"name":"CESBIO (UPS\/CNRS\/IRD\/CNES), 18 Avenue Edouard Belin, bpi 2801, 31401 Toulouse Cedex 9, France"}]},{"given":"Marc","family":"Crapeau","sequence":"additional","affiliation":[{"name":"INRA, EPHYSE, 71 Avenue Edouard Bourlaux, 33140 Villenave d\u2019Ornon, France"}]},{"given":"Kauzar","family":"Saleh","sequence":"additional","affiliation":[{"name":"MICINN, CDTI, Cid, 4, 28001 Madrid, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6425-6492","authenticated-orcid":false,"given":"Jean-Christophe","family":"Calvet","sequence":"additional","affiliation":[{"name":"CNRM-GAME, M\u00e9t\u00e9o-France, CNRS, URA 1357, 42 Avenue Gaspard Coriolis, 31057 Toulouse, France"}]},{"given":"Cl\u00e9ment","family":"Albergel","sequence":"additional","affiliation":[{"name":"CNRM-GAME, M\u00e9t\u00e9o-France, CNRS, URA 1357, 42 Avenue Gaspard Coriolis, 31057 Toulouse, France"}]},{"given":"Arnaud","family":"Mialon","sequence":"additional","affiliation":[{"name":"CESBIO (UPS\/CNRS\/IRD\/CNES), 18 Avenue Edouard Belin, bpi 2801, 31401 Toulouse Cedex 9, France"}]},{"given":"Natalie","family":"Novello","sequence":"additional","affiliation":[{"name":"INRA, EPHYSE, 71 Avenue Edouard Bourlaux, 33140 Villenave d\u2019Ornon, France"}]}],"member":"1968","published-online":{"date-parts":[[2011,12,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1168","DOI":"10.1109\/TGRS.2004.826820","article-title":"N-parameter retrievals from L-band microwave measurements over a variety of agricultural crops","volume":"42","author":"Wigneron","year":"2004","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"377","DOI":"10.1016\/j.rse.2006.02.021","article-title":"SMOSREX: A long term field campaign experiment for soil moisture and land surface processes remote sensing","volume":"102","author":"Calvet","year":"2006","journal-title":"Remote Sens. Environ."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"10","DOI":"10.1016\/j.rse.2006.12.001","article-title":"A field experiment on microwave forest radiometry: L-band signal behaviour for varying conditions of surface wetness","volume":"109","author":"Grant","year":"2007","journal-title":"Remote Sens. Environ."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"836","DOI":"10.1109\/36.239906","article-title":"Soil moisture and rainfall estimation over a semiarid environment with the ESTAR microwave radiometer","volume":"31","author":"Jackson","year":"1993","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1304","DOI":"10.1016\/j.rse.2009.02.013","article-title":"Soil moisture retrievals at L-band using a two-step inversion approach (COSMOS\/NAFE\u201905 Experiment)","volume":"113","author":"Saleh","year":"2009","journal-title":"Remote Sens. Environ."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"639","DOI":"10.1016\/j.rse.2006.10.014","article-title":"L-band Microwave Emission of the Biosphere (L-MEB) Model: Description and calibration against experimental data sets over crop fields","volume":"107","author":"Wigneron","year":"2007","journal-title":"Remote Sens. Environ."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1177","DOI":"10.1109\/TGRS.2010.2075935","article-title":"Evaluating an improved parameterization of the soil emission in L-MEB","volume":"49","author":"Wigneron","year":"2010","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"435","DOI":"10.1016\/j.rse.2008.10.010","article-title":"Evaluation of the SMOS L-MEB passive microwave soil moisture retrieval algorithm","volume":"113","author":"Panciera","year":"2009","journal-title":"Remote Sens. Environ."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"803","DOI":"10.1109\/TGRS.2003.811083","article-title":"Consequences of surface heterogeneity for parameter retrieval from 1.4 GHz multiangle SMOS observations","volume":"41","author":"Wigneron","year":"2003","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"416","DOI":"10.1109\/TGRS.2003.817976","article-title":"Characterizing the dependence of vegetation model parameters on crop structure, incidence angle, and polarization at L-band","volume":"42","author":"Wigneron","year":"2004","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"42","DOI":"10.1016\/j.rse.2006.12.002","article-title":"Estimates of surface soil moisture under grass covers using L-band radiometry","volume":"109","author":"Saleh","year":"2007","journal-title":"Remote Sens. Environ."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"808","DOI":"10.1109\/TGRS.2007.914801","article-title":"Calibration of the L-MEB Model over a coniferous and a deciduous forest","volume":"46","author":"Grant","year":"2008","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1978","DOI":"10.1109\/TGRS.2007.894935","article-title":"A simple model of the bare soil microwave emission at L-band","volume":"45","author":"Escorihuela","year":"2007","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"995","DOI":"10.1016\/j.rse.2009.12.011","article-title":"Effective soil moisture depth of L-band radiometry: A case study","volume":"114","author":"Escorihuela","year":"2010","journal-title":"Remote Sens. Environ."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"2674","DOI":"10.1109\/TGRS.2002.807003","article-title":"A parameterized surface reflectivity model and estimation of bare surface soil moisture with L-band radiometer","volume":"40","author":"Shi","year":"2002","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1697","DOI":"10.1109\/36.942548","article-title":"A simple parameterization of the L-band microwave emission from rough agricultural soils","volume":"39","author":"Wigneron","year":"2001","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"719","DOI":"10.3390\/s110100719","article-title":"CAROLS: A new airborne L-band radiometer for ocean surface and land observations","volume":"11","author":"Zribi","year":"2011","journal-title":"Sensors"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Albergel, C., Zakharova, E., Calvet, J.-C., Zribi, M., Pard\u00e9, M., Wigneron, J.-P., Novello, N., Kerr, Y., Mialon, A., and Fritz, N.E.-D. (2011). A first assessment of the SMOS data in southwestern France using in situ and airborne soil moisture estimates: The CAROLS airborne campaign. Remote Sens. Environ., accepted.","DOI":"10.1016\/j.rse.2011.06.012"},{"key":"ref_19","first-page":"2718","article-title":"Remote Sensing of sea surface salinity from CAROLS L-band radiometer in the Gulf of Biscay","volume":"115","author":"Martin","year":"2011","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1063","DOI":"10.1109\/TGRS.2010.2069101","article-title":"CAROLS L-band radiometer airborn campaign: Analysis of RFI issue","volume":"49","author":"Zribi","year":"2011","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1323","DOI":"10.5194\/hess-12-1323-2008","article-title":"From near-surface to root-zone soil moisture using an exponential filter: An assessment of the method based on in situ observations and model simulations","volume":"12","author":"Albergel","year":"2008","journal-title":"Hydrol. Earth Syst. Sci."},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Calvet, J.-C., Fritz, N., Froissard, F., Suquia, D., Petitpa, A., and Piguet, B. (2007, January 23\u201327). In situ Soil Moisture Observations for the CAL\/VAL of SMOS: The SMOSMANIA Network. Proceedings of International Geoscience and Remote Sensing Symposium, IGARSS2007, Barcelona, Spain.","DOI":"10.1109\/IGARSS.2007.4423019"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"1261","DOI":"10.1175\/1520-0442-16.9.1261","article-title":"A global database of land surface parameters at 1-km resolution in meteorological and climate models","volume":"16","author":"Masson","year":"2003","journal-title":"J Climate"},{"key":"ref_24","unstructured":"(1999). MODIS Vegetation Index (MOD 13): Algorithm Theoretical Basis Document, Available online: http:\/\/modis.gsfc.nasa.gov\/data\/atbd\/atbd_mod13.pdf."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"11229","DOI":"10.1029\/JC087iC13p11229","article-title":"A model for microwave emission from vegetation-covered fields","volume":"87","author":"Mo","year":"1982","journal-title":"J. Geophys. Res."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1109\/TGRS.1985.289498","article-title":"Microwave dielectric behavior of wet soil\u2014Part II: Dielectric mixing models","volume":"GE-23","author":"Dobson","year":"1985","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"5277","DOI":"10.1029\/JC086iC06p05277","article-title":"Remote sensing of soil moisture content over bare field at 1.4 GHz frequency","volume":"86","author":"Wang","year":"1981","journal-title":"J. Geophys. Res."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"431","DOI":"10.1137\/0111030","article-title":"An algorithm for least-squares estimation of nonlinear parameters","volume":"11","author":"Marquardt","year":"1963","journal-title":"J. Soc. Ind. Appl. Math."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/3\/12\/2591\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T21:58:12Z","timestamp":1760219892000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/3\/12\/2591"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2011,12,2]]},"references-count":28,"journal-issue":{"issue":"12","published-online":{"date-parts":[[2011,12]]}},"alternative-id":["rs3122591"],"URL":"https:\/\/doi.org\/10.3390\/rs3122591","relation":{},"ISSN":["2072-4292"],"issn-type":[{"type":"electronic","value":"2072-4292"}],"subject":[],"published":{"date-parts":[[2011,12,2]]}}}