Détail de la notice
Titre du Document
Retrieval of maize canopy fluorescence and reflectance by spectral fitting in the O2―A absorption band
Auteur(s)
MAZZONI M. ; MERONI M. ; FORTUNATO C. ; ...
Résumé
Canopy level chlorophyll fluorescence and reflectance of maize were retrieved simultaneously by using spectral fitting (SF) techniques applied to canopy and reference upwelling radiances measured on the ground in the O2―A atmospheric absorption band by means of a ground-measurements-based (GMB) method, using a white reference panel. This method was inspired by the Fluorescence Experiment (FLEX) mission concept, which is expected to provide the user community with a top-of-canopy radiance product, as well as sufficient data on atmospheric conditions to enable the simulation of a white reference panel radiance, after which the ground-based method can also be applied by the users of FLEX data. For the retrieval, a coupled surface-atmosphere radiative transfer model was also used to simulate the canopy radiance in specific atmospheric conditions and to quantify fluorescence and reflectance variables by using a second method based on the canopy radiance simulation (CRS), which uses the canopy radiance measurements only. The CRS method does not require any cross calibration of reference measurements, and is extremely useful when a reliable reference cannot be found. Part of the mathematical functions that modeled reflectance and fluorescence were recently used by the authors to perform simulations of observations from space. Simulations of the retrievals for both methods were performed at two different spectral band widths of 9 nm and 20 nm to evaluate the accuracy limits f
Editeur
Elsevier
Identifiant
ISSN : 0034-4257 CODEN : RSEEA7
Source
Remote sensing of environment A. 2012, vol. 124, pp. 72-82 [11 pages] [bibl. : 1/4 p.]
Langue
Anglais
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