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dc.contributor.authorGOBRON NADINEen_GB
dc.contributor.authorPINTY BERNARDen_GB
dc.contributor.authorTABERNER MALCOLMen_GB
dc.contributor.authorFABER Olgaen_GB
dc.contributor.authorMELIN FREDERICen_GB
dc.contributor.authorROBUSTELLI Monicaen_GB
dc.contributor.authorSNOEIJ Paulen_GB
dc.contributor.authorLAVERGNE T.en_GB
dc.contributor.authorAUSSEDAT O.en_GB
dc.date.accessioned2012-04-17T20:02:28Z-
dc.date.available2008-10-06en_GB
dc.date.available2012-04-17T20:02:28Z-
dc.date.created2008-10-06en_GB
dc.date.issued2008en_GB
dc.date.submitted2007-10-03en_GB
dc.identifier.citationREMOTE SENSING OF ENVIRONMENT vol. 112 p. 1871-1883en_GB
dc.identifier.issn0034-4257en_GB
dc.identifier.uriwww.elsevier.com/locate.rseen_GB
dc.identifier.urihttp://publications.jrc.ec.europa.eu/repository/handle/JRC40518-
dc.description.abstractThis paper discusses the accuracy of the operational Medium Resolution Imaging Spectrometer (MERIS) Level 2 land product which corresponds to the Fraction of Absorbed Photosynthetically Active Radiation (FAPAR). The FAPAR value is estimated from daily MERIS spectral measurements acquired at the top-of-atmosphere, using a physically based approach. The products are operationally available at the reduced spatial resolution, i.e. 1.2 km, and can be computed at the full spatial resolution, i.e. at 300 m, from the top-of-atmosphere MERIS data by using the same algorithm. The quality assessment of the MERIS FAPAR products capitalizes on the availability of five years of data acquired globally. The actual validation exercise is performed in two steps including, first, an analysis of the accuracy of the FAPAR algorithm itself with respect to the spectral measurements uncertainties and, second, with a direct comparison of the FAPAR time series against ground-based estimations as well as similar FAPAR products derived from other optical sensor data. The results indicate that the impact of top-of-atmosphere radiance uncertainties on the operational MERIS FAPAR products accuracy is expected to be at about 5-10 % and the agreement with the ground-based estimates over different canopy types is achieved within+ 0.1.en_GB
dc.description.sponsorshipJRC.H.5-Land Resources Managementen_GB
dc.format.mediumPrinteden_GB
dc.languageENGen_GB
dc.publisherELSEVIER SCIENCE INCen_GB
dc.relation.ispartofseriesJRC40518en_GB
dc.titleUncertainty Estimates for the FAPAR Operational Products Derived from MERIS - Impact of Top-of-Atmosphere Radiance Uncertainties and Validation with Field Dataen_GB
dc.typeArticles in periodicals and booksen_GB
dc.identifier.doi10.1016/j.rse.2007.09.011en_GB
JRC Directorate:Sustainable Resources

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