Third Radiation Transfer Model Intercomparison (RAMI) exercise: Documenting progress in canopy reflectance models

Abstract : The Radiation Transfer Model Intercomparison (RAMI) initiative benchmarks canopy reflectance models under well-controlled experimental conditions. Launched for the first time in 1999, this triennial community exercise encourages the systematic evaluation of canopy reflectance models on a voluntary basis. The first phase of RAMI focused on documenting the spread among radiative transfer (RT) simulations over a small set of primarily 1-D canopies. The second phase expanded the scope to include structurally complex 3-D plant architectures with and without background topography. Here sometimes significant discrepancies were noted which effectively prevented the definition of a reliable ''surrogate truth,'' over heterogeneous vegetation canopies, against which other RT models could then be compared. The present paper documents the outcome of the third phase of RAMI, highlighting both the significant progress that has been made in terms of model agreement since RAMI-2 and the capability of/need for RT models to accurately reproduce local estimates of radiative quantities under conditions that are reminiscent of in situ measurements. Our assessment of the self-consistency and the relative and absolute performance of 3-D Monte Carlo models in RAMI-3 supports their usage in the generation of a ''surrogate truth'' for all RAMI test cases. This development then leads (1) to the presentation of the ''RAMI Online Model Checker'' (ROMC), an open-access web-based interface to evaluate RT models automatically, and (2) to a reassessment of the role, scope, and opportunities of the RAMI project in the future.
Type de document :
Article dans une revue
Journal of Geophysical Research, American Geophysical Union, 2007, 112 (D9), pp.D09111:1-28. <10.1029/2006JD007821>


http://hal.ird.fr/ird-00405091
Contributeur : Dominique Bruel <>
Soumis le : lundi 20 juillet 2009 - 10:29:56
Dernière modification le : vendredi 25 juillet 2014 - 23:16:54
Document(s) archivé(s) le : mardi 15 juin 2010 - 20:24:46

Fichier

JGR2007_RAMI3_manuscript.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

Citation

Jean-Luc Widlowski, Malcolm Taberner, Bernard Pinty, Véronique Bruniquel-Pinel, Mathias Disney, et al.. Third Radiation Transfer Model Intercomparison (RAMI) exercise: Documenting progress in canopy reflectance models. Journal of Geophysical Research, American Geophysical Union, 2007, 112 (D9), pp.D09111:1-28. <10.1029/2006JD007821>. <ird-00405091>

Exporter

Partager

Métriques

Consultations de
la notice

636

Téléchargements du document

495