In: Wagner W„ Szekely, B. (eds.): ISPRS TC VII Symposium - 100 Years ISPRS, Vienna, Austria, July 5-7, 2010, IAPRS, Vol. XXXVIII, Part 7B 
653 
surface BRDF retrieval: A sensitivity study, IEEE Transactions 
on Geoscience and Remote Sensing, 36, 724-738. 
Liang, S., and Strahler, A., 1992, An Explicit Canopy BRDF 
Model and Inversion, In: Proceedings of the IEEE 
International Geosciences and Remote Sensing Symposium, 
Vol. 2, pp. 1487 - 1489. 
Lintermann, B. and Deussen, O., 1999, Interactive Modelling of 
Plants, IEEE Computer Graphics and Applications, 19(1), pp. 
2-11. 
Martens, S. N., Ustin, S. L., Norman, J. M., 1991, 
Measurements of tree canopy architectures, International 
Journal of Remote Sensing, 12(7), pp. 1525-1545. 
Oreskes, N. K., 1994, Verification, validation and confirmation 
of numerical models in the earth sciences. Science, 263, 641- 
646. 
Pinty, B., and Verstraete, M. M., 1992, On the Design and 
Validation of Surface Bidirectional Reflectance and Albedo 
Models, Remote Sensing of Environment, 41, pp. 155-167. 
Pinty, B., Gobron, N., Widlowski, J. -L., Gerstl, S. A. W., 
Verstraete, M. M., Antunes, M., Bacour, C., Gascon, F., 
Gastellu, J-P., Goel, N., Jacquemoud, S., North, P. R. J., Qin, 
W., Thompson, R., 2001, Radiation Transfer Model 
Intercomparison (RAMI) exercise. Journal of Geophysical 
Research, 106, pp. 11,937-11,956. 
Pinty, B., Widlowski, J.-L., Tabemer, M., Gobron, N., 
Verstraete, M. M., Disney, M., Gascon, F., Gastellu, J.-P., 
Jiang, L., Kuusk, A., Lewis, P., Li, X., Ni-Meister, W., Nilson, 
T., North, P., Qin, W., Su, L., Tang, S., Thompson, R., Verhoef, 
W., Wang, H., Wang, J., Yan, G., and Zang, H., 2004a. 
Radiation Transfer Model Intercomparison (RAMI) Exercise: 
Results from the Second Phase. Journal of Geophysical 
Research, 109, D06210.l-D06210.19, doi: 10.1029/2003JD004 
252. 
Pinty, B., N. Gobron, J.-L. Widlowski, T. Lavergne, and M. M. 
Verstraete, 2004b, Synergy between 1-D and 3-D radiation 
transfer models to retrieve vegetation canopy properties from 
remote sensing data, Journal of Geophysical Research, 109, 
D21205, doi: 10.1029/2004JD005214. 
Qin, W. and Liang, S., 2000, Plane-parallel Canopy Radiation 
Transfer Modeling: Recent Advances and Future Directions, 
Remote Sensing Review, 18, 281 -305. 
Ross, J., 1981, The Radiation Regime and Architecture of Plant 
Stands. Kluwer Academic Publishers, Boston, pp. 391. 
Schaaf, C., Li, X., and Strahler, A., 1994, Validation of 
Canopy Bidirectional Reflectance Models with Asas Imagery of 
a Spruce Forest in Maine, In: Proceedings of the IEEE 
International Geosciences and Remote Sensing Symposium: 
Surface and Atmospheric Remote Sensing: Technologies, Data 
Analysis and Interpretation, Vol. 3, pp. 1832-1834, 
doi: 10.1109/IGARSS. 1994.399581. 
Scholes, R. J., Frost, P. G. H., and Tian, Y., 2004, Canopy 
structure in Savannas along a moisture gradient on Kalahari 
sands, Global Change Biology, 10, 292-302. 
Sellers, P. J., et al., 1997, BOREAS in 1997: Experiment 
overview, scientific results and future directions, Journal of 
Geophysical Research, 102, 28,731- 28,770. 
Soffer, R. J., Miller, J. R., Wanner, W., and Strahler, A., 1995, 
Winter boreal forest canopy BRF results: comparison between 
airborne data, laboratory simulations and geometric-optical 
model data, In: Proceedings of the IEEE International 
Geosciences and Remote Sensing Symposium:Quantitative 
Remote Sensing for Science and Applications, Vol. 1, pp. 800 - 
802, doi: 10.1109/IGARSS. 1995.520589. 
Strahler, A. and Liang, S., 1994. Comparison of Radiative 
Transfer Models of Vegetation Canopies with Laboratory 
Measurements, In: Proceedings of the IEEE International 
Geosciences and Remote Sensing Symposium: Surface and 
Atmospheric Remote Sensing: Technologies, Data Analysis and 
Interpretation, Vol. 4, doi:10.1109/IGARSS. 1994.399733, 
pp. 2345-2347,. 
Strahler, A., 1997, Vegetation canopy reflectance modeling - 
recent developments and remote sensing perspectives. Remote 
Sensing Reviews, 15:1, 179-194. 
Streit, C., 1992, Graphtal user manual. Berne, Switzerland: 
University of Berne, SIG Computer Graphics. 
Widlowski, J.-L., Pinty B., Gobron, N., Verstraete, M. M., 
Diner, D. J., Davis, A. B., (2004), Canopy Structure parameters 
derived from multi-angular remote sensing data for terrestrial 
carbon studies, Climatic Change, 67, 403-415. 
Widlowski J.-L., Tabemer M., Pinty B., Bruniquel-Pinel, V., 
Disney, M., Fernandes, R., Gastellu-Etchegorry, J-P., Gobron, 
N., Kuusk, A., Lavergne, T., Leblanc, S., Lewis, P. E., Martin, 
E., Mottuse, M., North, P. R. J., Qin, W., Robustelli, M., 
Rochdi, N., Ruiloba, R., Soler, C., Thompson, R., Verhoef, W., 
Verstraete, M. M., Xie, D., 2007. The Third Radiation Transfer 
Model Intercomparison (RAMI) Exercise: Documenting 
Progress in Canopy Reflectance Modelling. Journal of 
Geophysical Research., 112, doi:10.1029/2006JD007821. 
Widlowski J.-L., Robustelli, M., Disney, M., Gastellu- 
Etchegorry, J-P., Lavergne, T., Lewis, P., North, P. R. J., Pinty, 
B., Thompson, R., and Verstraete, M. M., 2008. The RAMI On 
line Model Checker (ROMC): A web-based benchmarking 
facility for canopy reflectance models. Remote Sensing of 
Environment, 112, doi:10.1016/j.rse.2007.07.016, pp. 1144- 
1150. 
ACKNOWLEDGEMENTS 
I would like to acknowledge the support of the various RAMI 
participants who through their efforts and contributions 
managed to advance not only the quality of canopy RT models 
but also keep RAMI alive and developing. Similarly, I want to 
acknowledge the support of Dr. Alan Belward and my 
colleagues in the SOLO action of the Global Environment 
Monitoring unit of the Institute for Environment and 
Sustainability of the Joint Research Centre of the European 
Commission in Ispra, Italy for their continuing support for the 
RAMI project.