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.
Cogliati, S., Celesti, M., Cesana, I., Miglietta, F., Genesio, L., Julitta, T., et al. (2019). A spectral fitting algorithm to retrieve the fluorescence spectrum from canopy radiance. REMOTE SENSING, 11(16), 1840 [10.3390/rs11161840].
|Citazione:||Cogliati, S., Celesti, M., Cesana, I., Miglietta, F., Genesio, L., Julitta, T., et al. (2019). A spectral fitting algorithm to retrieve the fluorescence spectrum from canopy radiance. REMOTE SENSING, 11(16), 1840 [10.3390/rs11161840].|
|Tipo:||Articolo in rivista - Articolo scientifico|
|Carattere della pubblicazione:||Scientifica|
|Presenza di un coautore afferente ad Istituzioni straniere:||Si|
|Titolo:||A spectral fitting algorithm to retrieve the fluorescence spectrum from canopy radiance|
|Autori:||Cogliati, S; Celesti, M; Cesana, I; Miglietta, F; Genesio, L; Julitta, T; Schuettemeyer, D; Drusch, M; Rascher, U; Jurado, P; Colombo, R|
COGLIATI, SERGIO (Corresponding)
|Data di pubblicazione:||2019|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.3390/rs11161840|
|Appare nelle tipologie:||01 - Articolo su rivista|