Evaluation of fraction of absorbed photosynthetically active radiation products for different canopy radiation transfer regimes : Methodology and results using Joint Research Center products derived from SeaWiFS against ground-based estimations

Gobron Nadine, Pinty Bernard, Aussedat Ophélie, Chen Jing M., Cohen Warren B., Fensholt Rasmus, Gond Valéry, Huemmrich Karl Fred, Lavergne Thomas, Mélin Frédéric, Privette Jeffrey L., Sandholt Inge, Taberner Malcolm, Turner David P., Verstraete Michel M., Widlowski Jean-Luc. 2006. Evaluation of fraction of absorbed photosynthetically active radiation products for different canopy radiation transfer regimes : Methodology and results using Joint Research Center products derived from SeaWiFS against ground-based estimations. Journal of Geophysical Research. Atmospheres, 111 (D13) : 1-15.

Résumé : This paper discusses the quality and the accuracy of the Joint Research Center (JRC) fraction of absorbed photosynthetically active radiation (FAPAR) products generated from an analysis of Sea-viewing Wide Field-of-view Sensor (SeaWiFS) data. The FAPAR value acts as an indicator of the presence and state of the vegetation and it can be estimated from remote sensing measurements using a physically based approach. The quality of the SeaWiFS FAPAR products assessed in this paper capitalizes on the availability of a 6-year FAPAR time series over the full globe. This evaluation exercise is performed in two phases involving, first, an analysis of the verisimilitude of the FAPAR products under documented environmental conditions and, second, a direct comparison of the FAPAR values with ground-based estimations where and when the latter are available. This second phase is conducted following a careful analysis of problems arising for performing such a comparison. This results in the grouping of available field information into broad categories representing different radiative transfer regimes. This strategy greatly helps the interpretation of the results since it recognizes the various levels of difficulty and sources of uncertainty associated with the radiative sampling of different types of vegetation canopies.

Mots-clés Agrovoc : photosynthèse, radiation solaire, absorption, végétation, télédétection, méthode, Houppier

Classification Agris : U30 - Méthodes de recherche
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : Axe 6 (2005-2013) - Agriculture, environnement, nature et sociétés

Auteurs et affiliations

• Gobron Nadine, Institut des applications de la télédétection (ITA)
• Pinty Bernard, Institut des applications de la télédétection (ITA)
• Aussedat Ophélie, Institut des applications de la télédétection (ITA)
• Chen Jing M., Université de Toronto (CAN)
• Cohen Warren B., USDA (USA)
• Fensholt Rasmus, UCPH (DNK)
• Gond Valéry, CIRAD-FORET-UPR Ressources forestières (CAN) ORCID: 0000-0002-0080-3140
• Huemmrich Karl Fred, NASA (USA)
• Lavergne Thomas, Institut des applications de la télédétection (ITA)
• Mélin Frédéric, Institut des applications de la télédétection (ITA)
• Privette Jeffrey L., NASA (USA)
• Sandholt Inge, UCPH (DNK)
• Taberner Malcolm, Institut des applications de la télédétection (ITA)
• Turner David P., Oregon State University (USA)
• Verstraete Michel M., Institut des applications de la télédétection (ITA)
• Widlowski Jean-Luc, Institut des applications de la télédétection (ITA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/543567/)

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