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Comparison between SMOS Vegetation Optical Depth products and MODIS vegetation indices over crop zones of the USA

hal.structure.identifierCentre d'études spatiales de la biosphère [CESBIO]
hal.structure.identifierSkane University Hospital [Lund]
dc.contributor.authorLAWRENCE, Heather
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorWIGNERON, Jean-Pierre
hal.structure.identifierCentre d'études spatiales de la biosphère [CESBIO]
dc.contributor.authorRICHAUME, Philippe
hal.structure.identifierÉcologie fonctionnelle et physique de l'environnement [EPHYSE]
dc.contributor.authorNOVELLO, Nathalie
hal.structure.identifierSkane University Hospital [Lund]
dc.contributor.authorGRANT, Jennifer
hal.structure.identifierCentre National d’Etudes Spatiales
dc.contributor.authorMIALON, Arnaud
hal.structure.identifierCentre d'études spatiales de la biosphère [CESBIO]
dc.contributor.authorAHMAD, Al Bitar
hal.structure.identifierCentre d'études spatiales de la biosphère [CESBIO]
dc.contributor.authorMERLIN, Olivier
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorGUYON, Dominique
hal.structure.identifierCentre d'études spatiales de la biosphère [CESBIO]
dc.contributor.authorLEROUX, Delphine
hal.structure.identifierCentre d'études spatiales de la biosphère [CESBIO]
dc.contributor.authorBIRCHER, Simone
hal.structure.identifierCentre d'études spatiales de la biosphère [CESBIO]
dc.contributor.authorKERR, Yann H.
dc.date.accessioned2024-04-08T12:02:25Z
dc.date.available2024-04-08T12:02:25Z
dc.date.issued2014
dc.identifier.issn0034-4257
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/196202
dc.description.abstractEnThe Soil Moisture and Ocean Salinity (SMOS) mission provides multi-angular, dual-polarised brightness temperatures at 1.4 GHz, from which global soil moisture and vegetation optical depth (τ) products are retrieved. This paper presents a study of SMOS' τ product in 2010 and 2011 for crop zones of the USA. Retrieved τ values for 504 crop nodes were compared to optical/IR vegetation indices from the MODIS (Moderate Resolution Imaging Spectroradiometer) satellite sensor, including the Normalised Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Leaf Area Index (LAI), and a Normalised Difference Water Index (NDWI) product. τ values were observed to increase during the growing season and decrease during senescence in these areas, as did MODIS vegetation indices. SMOS' τ values generally peaked later than MODIS LAI values, with an estimated time difference of about 19 days. A linear regression between τ and the MODIS products was carried out for each node and values of the determination coefficient, R2, slope, b′ and intercept, b″ were found. The average R2 value varied from 0.32 to 0.35 for the different vegetation indices. The linear regression between LAI and τ produced an average slope of b′ = 0.06, and an average intercept of b″ = 0.14. The effects of crop fraction and dominant crop type were investigated and crop fraction was found to have a low effect on R2 values. R2values appeared to be lower for wheat and hay and higher for corn. b′ and b″ values had higher standard deviations for wheat but were generally close to the mean values for corn, soybean and hay.
dc.language.isoen
dc.publisherElsevier
dc.subjectSMOS
dc.subjectoptical vegetation indices
dc.subject.enL-band radiometry
dc.subject.envegetation optical depth
dc.title.enComparison between SMOS Vegetation Optical Depth products and MODIS vegetation indices over crop zones of the USA
dc.typeArticle de revue
dc.identifier.doi10.1016/j.rse.2013.07.021
dc.subject.halSciences de l'ingénieur [physics]/Traitement du signal et de l'image
bordeaux.journalRemote Sensing of Environment
bordeaux.page396-406
bordeaux.volume140
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-02636019
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02636019v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Remote%20Sensing%20of%20Environment&rft.date=2014&rft.volume=140&rft.spage=396-406&rft.epage=396-406&rft.eissn=0034-4257&rft.issn=0034-4257&rft.au=LAWRENCE,%20Heather&WIGNERON,%20Jean-Pierre&RICHAUME,%20Philippe&NOVELLO,%20Nathalie&GRANT,%20Jennifer&rft.genre=article


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