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Direct Mode

RAMI1 phase

The purpose of RAMI experiments in direct mode is to assess whether different RT models can generate comparable spectral Bidirectional Reflectance Factors (BRF) given precisely defined environmental and observational conditions.
Two categories of such conditions were setup, for homogeneous and heterogeneous environments, respectively. Within each of these two categories of scenes, the scattering medium could contain non-dimensional scatterers (turbid case) or finite-sized scatterer (discrete case).
Graphical visualizations of these environments are available on their respective pages.

By following the above links instructions are obtained that allow for the implementation of the prescribed test cases.

Once a RT models has been set up to represent one of these environments, the spectral and directional reflectance fields can be generated (for precisely specified illumination and observation conditions), and further information can be derived, such as the albedo of the geophysical system, or, the fraction of absorbed radiation.

Prior to the performing of any RT model simulations, please refer to the 'definitions' pages for detailed instructions regarding the angular sign conventions for BRF simulations, as well as precise definitions of the required leaf normal distributions and other RT model technicalities. Also read the relevant file naming and formatting conventions that must be adhered to by all participants.