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A Spectral Fitting Algorithm to Retrieve the Fluorescence Spectrum from Canopy Radiance

Cogliati, Sergio ; Celesti, Marco ; Cesana, Ilaria ; Miglietta, Franco ; Genesio, Lorenzo ; Julitta, Tommaso ; Schuettemeyer, Dirk ; Drusch, Matthias ; Rascher, Uwe ; Jurado, Pedro ; Colombo, Roberto

Remote sensing (Basel, Switzerland), 2019-08, Vol.11 (16), p.1840 [Periódico revisado por pares]

Basel: MDPI AG

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Título:
A Spectral Fitting Algorithm to Retrieve the Fluorescence Spectrum from Canopy Radiance
Autor: Cogliati, Sergio ; Celesti, Marco ; Cesana, Ilaria ; Miglietta, Franco ; Genesio, Lorenzo ; Julitta, Tommaso ; Schuettemeyer, Dirk ; Drusch, Matthias ; Rascher, Uwe ; Jurado, Pedro ; Colombo, Roberto
Assuntos: Algorithms ; Canopies ; Chlorophyll ; Computer simulation ; field spectroscopy ; FLEX ; Fluorescence ; fluorescence spectrum ; Forage crops ; Leaf area ; Leaf area index ; Mathematical functions ; Noise levels ; Parameters ; Principal components analysis ; Radiance ; Radiative transfer ; Reflectance ; Reliability analysis ; Remote sensing ; Retrieval ; SFM ; Spectra ; spectral fitting method ; Spectroscopy ; Structural analysis ; Sun ; sun-induced chlorophyll fluorescence
É parte de: Remote sensing (Basel, Switzerland), 2019-08, Vol.11 (16), p.1840
Descrição: Retrieval 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.
Editor: Basel: MDPI AG
Idioma: Inglês

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A Spectral Fitting Algorithm to Retrieve the Fluorescence Spectrum from Canopy Radiance

Cogliati, Sergio ; Celesti, Marco ; Cesana, Ilaria ; Miglietta, Franco ; Genesio, Lorenzo ; Julitta, Tommaso ; Schuettemeyer, Dirk ; Drusch, Matthias ; Rascher, Uwe ; Jurado, Pedro ; Colombo, Roberto

Basel: MDPI AG

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