This is the official site of the radiation transfer model intercomparison (RAMI) initiative. RAMI proposes a mechanism to benchmark models designed to simulate the transfer of radiation at or near the Earth's terrestrial surface, i.e., in plant canopies and over soil surfaces. As an open-access, on-going activity, RAMI operates in successive phases each one aiming at re-assessing the capability, performance and agreement of the latest generation of radiation transfer (RT) models. This in turn, will lead to model enhancements and further developments that benefit the RT modelling community as a whole. Currently the fourth phase of RAMI is open:
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The fourth phase of RAMI aims at evaluating bi-directional canopy reflectance models, light transmission and absorption models, as well as models capable of simulating waveform Lidar signals and thresholded hemispherical photographs. RAMI-IV proposes two different types of test environments: 1) abstract canopies, that are generated only on the basis of disc-shaped scatterers, and 2) actual canopies,that are based on inventories of actual forest and plantation test sites. Submissions to RAMI-IV are welcome from both 1-D and 3-D models. 
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During the active submission period of a given phase of RAMI, participation is open to everyone willing to run a previously published model against an ensemble of prescribed test cases. Previous RAMI phases have not only led to improved computer codes and publications in the refereed scientific literature, but also to the development of the RAMI On-line Model Checker (ROMC). The ROMC is a web-based tool allowing users to compare their model simulations (in forward mode) against a reference solution derived from a series of 3D Monte Carlo models participating in the third phase of RAMI. For more information on RAMI, please consult the FAQs and our privacy and data-usage policy via this DISCLAIMER link.
| Phase | Active Period | Participants | First Presentation of Results | Scientific Publication |
| RAMI-1 | Mar - Aug 1999 | 1-D models: 3 3-D models: 5 |
Sep 1999: IWMMM-2, Ispra, Italy | JGR, Vol 106, D11, 11,937-11,956, 2001 Bibliography: LaTeX, Word, ASCII |
| RAMI-2 | Feb - Jun 2002 | 1-D models: 3 3-D models: 10 |
Jun 2002: IWMMM-3, Steamboat Springs, USA | JGR, Vol 109, No. D6210, 2004 Bibliography: LaTeX, Word, ASCII |
| RAMI-3 | Mar - Dec 2005 | 1-D models: 5 3-D models: 13 |
Oct 2005: ISPMSRS, Beijing, China (Homogeneous only) Mar 2006: IWMMM-4, Sydney, Australia (All results) |
JGR, vol 112, 2007 doi 10.1029/2006JD007821, Bibliography: LaTeX, Word, ASCII |
Related model intercomparison and quality assurance activities include:
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