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@ARTICLE{Cogliati:866589,
author = {Cogliati, Sergio and Celesti, Marco and Cesana, Ilaria and
Miglietta, Franco and Genesio, Lorenzo and Julitta, Tommaso
and Schuettemeyer, Dirk and Drusch, Matthias and Rascher,
Uwe and Jurado, Pedro and Colombo, Roberto},
title = {{A} {S}pectral {F}itting {A}lgorithm to {R}etrieve the
{F}luorescence {S}pectrum from {C}anopy {R}adiance},
journal = {Remote sensing},
volume = {11},
number = {16},
issn = {2072-4292},
address = {Basel},
publisher = {MDPI},
reportid = {FZJ-2019-05670},
pages = {1840 -},
year = {2019},
abstract = {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},
cin = {IBG-2},
ddc = {620},
cid = {I:(DE-Juel1)IBG-2-20101118},
pnm = {582 - Plant Science (POF3-582)},
pid = {G:(DE-HGF)POF3-582},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000484387600003},
doi = {10.3390/rs11161840},
url = {https://juser.fz-juelich.de/record/866589},
}