%0 Journal Article
%A Cogliati, Sergio
%A Celesti, Marco
%A Cesana, Ilaria
%A Miglietta, Franco
%A Genesio, Lorenzo
%A Julitta, Tommaso
%A Schuettemeyer, Dirk
%A Drusch, Matthias
%A Rascher, Uwe
%A Jurado, Pedro
%A Colombo, Roberto
%T A Spectral Fitting Algorithm to Retrieve the Fluorescence Spectrum from Canopy Radiance
%J Remote sensing
%V 11
%N 16
%@ 2072-4292
%C Basel
%I MDPI
%M FZJ-2019-05670
%P 1840 -
%D 2019
%X 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
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000484387600003
%R 10.3390/rs11161840
%U https://juser.fz-juelich.de/record/866589