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000866589 1001_ $$00000-0002-7192-2032$$aCogliati, Sergio$$b0$$eCorresponding author
000866589 245__ $$aA Spectral Fitting Algorithm to Retrieve the Fluorescence Spectrum from Canopy Radiance
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000866589 520__ $$aRetrieval of Sun-Induced Chlorophyll Fluorescence (F) spectrum is one of the challenging perspectives for further advancing F studies towards a better characterization of vegetation structure and functioning. In this study, a simplified Spectral Fitting retrieval algorithm suitable for retrieving the F spectrum with a limited number of parameters is proposed (two parameters for F). The novel algorithm is developed and tested on a set of radiative transfer simulations obtained by coupling SCOPE and MODTRAN5 codes, considering different chlorophyll content, leaf area index and noise levels to produce a large variability in fluorescence and reflectance spectra. The retrieval accuracy is quantified based on several metrics derived from the F spectrum (i.e., red and far-red peaks, O2 bands and spectrally-integrated values). Further, the algorithm is employed to process experimental field spectroscopy measurements collected over different crops during a long-lasting field campaign. The reliability of the retrieval algorithm on experimental measurements is evaluated by cross-comparison with F values computed by an independent retrieval method (i.e., SFM at O2 bands). For the first time, the evolution of the F spectrum along the entire growing season for a forage crop is analyzed and three diverse F spectra are identified at different growing stages. The results show that red F is larger for young canopy; while red and far-red F have similar intensity in an intermediate stage; finally, far-red F is significantly larger for the rest of the season
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000866589 7001_ $$00000-0001-7249-7106$$aCelesti, Marco$$b1
000866589 7001_ $$0P:(DE-HGF)0$$aCesana, Ilaria$$b2
000866589 7001_ $$0P:(DE-HGF)0$$aMiglietta, Franco$$b3
000866589 7001_ $$0P:(DE-HGF)0$$aGenesio, Lorenzo$$b4
000866589 7001_ $$0P:(DE-HGF)0$$aJulitta, Tommaso$$b5
000866589 7001_ $$0P:(DE-HGF)0$$aSchuettemeyer, Dirk$$b6
000866589 7001_ $$0P:(DE-HGF)0$$aDrusch, Matthias$$b7
000866589 7001_ $$0P:(DE-Juel1)129388$$aRascher, Uwe$$b8
000866589 7001_ $$0P:(DE-HGF)0$$aJurado, Pedro$$b9
000866589 7001_ $$0P:(DE-HGF)0$$aColombo, Roberto$$b10
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