Performance of spectral fitting methods for vegetation fluorescence quantification

M. Meroni, D. Busetto, R. Colombo, L. Guanter, J. Moreno, W. Verhoef

Research output: Contribution to journalArticleAcademicpeer-review

90 Citations (Scopus)

Abstract

The Fraunhofer Line Discriminator (FLD) principle has long been considered as the reference method to quantify solar-induced chlorophyll fluorescence (F) from passive remote sensing measurements. Recently, alternative retrieval algorithms based on the spectral fitting of hyperspectral radiance observations, Spectral Fitting Methods (SFMs), have been proposed. The aim of this manuscript is to investigate the performance of such algorithms and to provide relevant information regarding their use. FLD and SFMs were used to estimate F starting from Top Of Canopy (TOC) fluxes at very high spectral resolution (0.12 nm) and sampling interval (0.1 nm), exploiting the O2-B (687.0 nm) and O2-A (760.6 nm) atmospheric oxygen absorption bands overlapping the fluorescence emissions at the red and far-red spectral window. Specific parameters affecting FLD and SFM performances are investigated and the accuracy of F estimation of the two methods is compared. The problem related to the lack of independent measurements of F at canopy level, which prevents the direct assessment of F estimation accuracy with actual measurements, is overcome in this study by using a modeled database of TOC reflectance spectra. In order to compute accuracy figures valid for operative applications the simulated spectra were perturbed by the addition of radiometric noise. An investigation was conducted to determine the best FLD channel configuration; it showed that violation of FLD assumptions results in a positive bias in F estimation at both oxygen absorption bands that cannot be avoided even at the high spectral resolution considered. SFMs were shown to be more accurate than FLD under any noise configuration considered
Original languageEnglish
Pages (from-to)363-374
JournalRemote Sensing of Environment
Volume114
Issue number2
DOIs
Publication statusPublished - 2010

Fingerprint

Discriminators
fluorescence
Fluorescence
vegetation
Spectral resolution
canopy
spectral resolution
Absorption spectra
methodology
oxygen
canopy reflectance
Oxygen
Chlorophyll
radiance
reflectance
remote sensing
method
Remote sensing
chlorophyll
Fluxes

Keywords

  • induced chlorophyll fluorescence
  • in-vivo
  • reflectance
  • model
  • photosynthesis
  • spectroradiometer
  • luminescence
  • scattering
  • airborne
  • canopy

Cite this

Meroni, M., Busetto, D., Colombo, R., Guanter, L., Moreno, J., & Verhoef, W. (2010). Performance of spectral fitting methods for vegetation fluorescence quantification. Remote Sensing of Environment, 114(2), 363-374. https://doi.org/10.1016/j.rse.2009.09.010
Meroni, M. ; Busetto, D. ; Colombo, R. ; Guanter, L. ; Moreno, J. ; Verhoef, W. / Performance of spectral fitting methods for vegetation fluorescence quantification. In: Remote Sensing of Environment. 2010 ; Vol. 114, No. 2. pp. 363-374.
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Meroni, M, Busetto, D, Colombo, R, Guanter, L, Moreno, J & Verhoef, W 2010, 'Performance of spectral fitting methods for vegetation fluorescence quantification', Remote Sensing of Environment, vol. 114, no. 2, pp. 363-374. https://doi.org/10.1016/j.rse.2009.09.010

Performance of spectral fitting methods for vegetation fluorescence quantification. / Meroni, M.; Busetto, D.; Colombo, R.; Guanter, L.; Moreno, J.; Verhoef, W.

In: Remote Sensing of Environment, Vol. 114, No. 2, 2010, p. 363-374.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Performance of spectral fitting methods for vegetation fluorescence quantification

AU - Meroni, M.

AU - Busetto, D.

AU - Colombo, R.

AU - Guanter, L.

AU - Moreno, J.

AU - Verhoef, W.

PY - 2010

Y1 - 2010

N2 - The Fraunhofer Line Discriminator (FLD) principle has long been considered as the reference method to quantify solar-induced chlorophyll fluorescence (F) from passive remote sensing measurements. Recently, alternative retrieval algorithms based on the spectral fitting of hyperspectral radiance observations, Spectral Fitting Methods (SFMs), have been proposed. The aim of this manuscript is to investigate the performance of such algorithms and to provide relevant information regarding their use. FLD and SFMs were used to estimate F starting from Top Of Canopy (TOC) fluxes at very high spectral resolution (0.12 nm) and sampling interval (0.1 nm), exploiting the O2-B (687.0 nm) and O2-A (760.6 nm) atmospheric oxygen absorption bands overlapping the fluorescence emissions at the red and far-red spectral window. Specific parameters affecting FLD and SFM performances are investigated and the accuracy of F estimation of the two methods is compared. The problem related to the lack of independent measurements of F at canopy level, which prevents the direct assessment of F estimation accuracy with actual measurements, is overcome in this study by using a modeled database of TOC reflectance spectra. In order to compute accuracy figures valid for operative applications the simulated spectra were perturbed by the addition of radiometric noise. An investigation was conducted to determine the best FLD channel configuration; it showed that violation of FLD assumptions results in a positive bias in F estimation at both oxygen absorption bands that cannot be avoided even at the high spectral resolution considered. SFMs were shown to be more accurate than FLD under any noise configuration considered

AB - The Fraunhofer Line Discriminator (FLD) principle has long been considered as the reference method to quantify solar-induced chlorophyll fluorescence (F) from passive remote sensing measurements. Recently, alternative retrieval algorithms based on the spectral fitting of hyperspectral radiance observations, Spectral Fitting Methods (SFMs), have been proposed. The aim of this manuscript is to investigate the performance of such algorithms and to provide relevant information regarding their use. FLD and SFMs were used to estimate F starting from Top Of Canopy (TOC) fluxes at very high spectral resolution (0.12 nm) and sampling interval (0.1 nm), exploiting the O2-B (687.0 nm) and O2-A (760.6 nm) atmospheric oxygen absorption bands overlapping the fluorescence emissions at the red and far-red spectral window. Specific parameters affecting FLD and SFM performances are investigated and the accuracy of F estimation of the two methods is compared. The problem related to the lack of independent measurements of F at canopy level, which prevents the direct assessment of F estimation accuracy with actual measurements, is overcome in this study by using a modeled database of TOC reflectance spectra. In order to compute accuracy figures valid for operative applications the simulated spectra were perturbed by the addition of radiometric noise. An investigation was conducted to determine the best FLD channel configuration; it showed that violation of FLD assumptions results in a positive bias in F estimation at both oxygen absorption bands that cannot be avoided even at the high spectral resolution considered. SFMs were shown to be more accurate than FLD under any noise configuration considered

KW - induced chlorophyll fluorescence

KW - in-vivo

KW - reflectance

KW - model

KW - photosynthesis

KW - spectroradiometer

KW - luminescence

KW - scattering

KW - airborne

KW - canopy

U2 - 10.1016/j.rse.2009.09.010

DO - 10.1016/j.rse.2009.09.010

M3 - Article

VL - 114

SP - 363

EP - 374

JO - Remote Sensing of Environment

JF - Remote Sensing of Environment

SN - 0034-4257

IS - 2

ER -