Within this section of the RAMI initiative homogeneous environments have to be simulated where scatterers possess the typical optical properties of vegetation in the red and near-infrared spectral domain. Two types of homogeneous environments are being considered:
Homogeneous environments are typically represented with 1-dimensional models, where the only spatial coordinate represented explicitly is along the vertical. However, for the case of finite-sized scatterers, the geophysical medium is intrinsically 3-dimensional, since the individual scatterers are oriented finite size objects, even though it may be simulated statistically without an explicit representation of horizontal variations.
In absence of any absolute reference truth RT model performance can be expressed in terms of the deviation between some model m and another model c from among the ensemble of models that performed a given set of spectral (lambda), structural (zeta), illumination (Omega_i) and viewing (Omega_v) conditions. Averaging over an appropriate set of such conditions will allow to compute a (delta_m<->c) model-to-model dispersion statistics [%]:
is the total number of all spectral (lambda), structural (zeta), illumination(Omega_i) and viewing (Omega_v) conditions used in the averageing.