Contribution à la télédétection passive de la fluorescence chlorophyllienne des végétaux

Abstract : The work performed during this thesis focuses on the study and use of a passive measurement method for remote sensing of sun-induced chlorophyll fluorescence at canopy scale. This method is based on the measurement of the deformation of the oxygen absorption bands of the solar spectrum in the irradiance spectrum, after interaction with vegetation. A new algorithm for calculating the fluorescence was developed. It applies to measurements made in a few channels around the absorption bands of oxygen and takes into account variations in reflectance of vegetation interfering with the estimation of fluorescence. In the context of long-distance measurements, a modelisation using the radiative transfer code MODTRAN has allowed the study of atmospheric effects affecting the measurement of fluorescence. It was shown that in addition to knowledge of atmospheric conditions, the characterization of the environment of the target is essential: its contribution, highly variable spatially, may be greater than the fluorescence signal. An operational method of atmospheric effects correction has been proposed and applied to the measurements made during the airborne campaign ESA-CEFLES2. A field platform for continuous measurement of fluorescence at the canopy was set up and a new sensor developed. Several measurements campaigns were made showing that the fluorescence measured in the near infra-red could be used as an indicator of biomass, and that the ratio of red fluorescence / near infra-red fluorescence, carries information about the structure of vegetation.
Liste complète des métadonnées

https://pastel.archives-ouvertes.fr/pastel-00563244
Contributor : Fabrice Daumard <>
Submitted on : Friday, February 4, 2011 - 2:27:41 PM
Last modification on : Friday, April 5, 2019 - 8:03:42 PM

Identifiers

  • HAL Id : pastel-00563244, version 1

Citation

Fabrice Daumard. Contribution à la télédétection passive de la fluorescence chlorophyllienne des végétaux. Interfaces continentales, environnement. Ecole Polytechnique X, 2010. Français. ⟨pastel-00563244⟩

Share

Metrics

Record views

862

Files downloads

3569