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Active submission period:

Abstract canopies - February 2009 - June 2009

Actual canopies - February 2009 - January 2010

On-line results publication: June 2013 (abstract) - August 2015 (actual)

Scientific Publications:

• Abstract canopies

Widlowski J.-L., Pinty B., Lopatka M., Atzberger C., Buzica D., Chelle M., Disney M., Gastellu-Etchegorry J. P., Gerboles M., Gobron N., Grau E., Huang H., Kallel A., Kobayashi H., Lewis P., Qin W., Schlerf M., Stuckens J. and Xie D. (2013), 'The fourth Radiation Transfer Model Intercomparison (RAMI-IV): Proficiency Testing of Canopy Reflectance Models with ISO-13528.', Journal of Geophysical Research - Atmospheres, 118, D09111, 13. DOI: http://dx.doi.org/10.1002/jgrd.50497. Bibliography: LaTeX, Word



• Actual canopies

Widlowski J.-L., Mio C., Disney M., Adams J., Andredakis I., Atzberger C., Brennan J., Busetto L., Chelle M., Ceccherini G., Colombo R., Côté J-F., Eenmäe A., Essery R., Gastellu-Etchegorry J. P., Gobron N., Grau E., Haverd V., Homolová L., Huang H., Hunt L., Kobayashi H., Koetz B., Kuusk A., Kuusk J., Lang M., Lewis P., Lovell J. L., Malenovsky Z., Meroni M., Morsdorf F., Mõttus M., Ni-Meister W., Pinty B., Rautiainen M., Schlerf M., Somers B., Stuckens J., Verstraete M. M., Yang W., Zhao F. and Zenone T. (2015), 'The fourth phase of the radiative transfer model intercomparison (RAMI) exercise: Actual canopy scenarios and conformity testing.', Remote Sensing of Environment, 169:, 418-437. DOI: http://dx.doi.org/10.1016/j.rse.2015.08.016. Bibliography: LaTeX, Word

Overview:

The active submission period of the fourth phase of RAMI is now closed. Submitted simulation results are currently being analysed. RAMI-IV featured a completely new set of experiments that can be grouped into two separate categories:

• Abstract canopies contain both homogeneous (HOM) and heterogeneous (HET) leaf canopies that are both exclusively composed of disc-shaped finite-sized scatterers. These test cases are all based upon similar experiments from previous phases of RAMI. Note, however, that the number of the prescribed measurements differs between the HOM and HET canopy scenes.

Anisotropic background (HOM)	Two-layer canopy (HOM)	Adjacent canopies (HOM)
Anisotropic background (HET)	Two-layer canopy (HET)	Constant slope (HET)

• Actual canopies are reconstructed from detailed inventories of both the structural and spectral properties of existing plantations and forest stands. Canopy descriptions therefore contain a large amount of statistics that should allow different types of RT models to implement the stand architectures and to generate a variety of radiative quantities in multiple spectral bands in the solar domain (as well as under conservative scattering conditions). Note, that the number of prescribed measurements differs between the forest and plantation scenes.

Järvselja pine stand (summer), Estonia	Ofenpass pine stand (winter), Switzerland	Järvselja birch stand (summer), Estonia
Wellington citrus orchard, South Africa	Järvselja birch stand (winter), Estonia	Lombardy short rotation forest, Italy

Access to the various experiment description pages can be obtained by clicking on the corresponding images above. First time users, on the other hand, may want to explore the various test cases of this fourth RAMI phase by using the hierarchic link provided below. In addition, a synoptic overview table is also provided to give direct access to all experiments of RAMI-IV (left column) and their associated measurements (right column).

• SYNOPTIC OVERVIEW OF EXPERIMENTS AND MEASUREMENTS
• SYNOPTIC OVERVIEW OF RESULTS

First time users interested in participating in RAMI events, may want to read the FAQ section to get started, in particular, the How can I participate with my model(s) in a RAMI phase? question. Veteran users (and others) should inform themselves of the full list of (file formatting and other) new features in RAMI-IV. Note also that RAMI-IV offers participants the possibility to test the compliance of their model-generated results files with the RAMI file-naming and formatting convention, prior to their submission via ftp: To do so follow the pulsating on-line format checker link in the top navigation bar. Once your files are ready please follow the instructions given in the FAQ: How do I submit my results?