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RAMI3 phase

These objects, in turn, contained a 'gas' (to be treated as a turbid medium) of dimension-less particles representing the leaves. These scattering particles were characterized by specified radiative properties (reflectance, transmittance), and the orientation of the normals to the scatterers followed exclusively a uniform distribution function. The radiative properties of the underlying soil were also specified (in this case a simple Lambertian scattering law). The particular values selected for these input variables represented classical plant canopy conditions.

The following figures exhibit a graphical representation of such a scene, from the side

Single collided BRF components
The figures exhibit a graphical representation of such a scene, from the side.
Single collided BRF components
The figures exhibit a graphical representation of such a scene, from the top.
Single collided BRF components
The zero azimuth line.

The architecture of this scene (HET02) is precisely characterized as follows:

Scene dimensions:

( X × Y × Z)100.0 × 100.0 × 30.0 [m × m × m]
(Xmin, Ymin, Zmin)−50.0, −50.0, 0.0 [m, m, m]
(Xmin, Ymax, Zmin)−50.0, +50.0, 0.0 [m, m, m]
(Xmax, Ymin, Zmin)+50.0, −50.0, 0.0 [m, m, m]
(Xmax, Ymax, Zmin)+50.0, +50.0, 0.0 [m, m, m]
(Xmin, Ymin, Zmax)−50.0, −50.0, 30.0 [m, m, m]
(Xmin, Ymax, Zmax)−50.0, +50.0, 30.0 [m, m, m]
(Xmax, Ymin, Zmax)+50.0, −50.0, 30.0 [m, m, m]
(Xmax, Ymax, Zmax)+50.0, +50.0, 30.0 [m, m, m]
Scatterer shapeDisc of negligible thickness
Scatterer radius0 or close to 0 [m]
LAI of individual sphere5.0
Scatterer normal distributionUniform
Number of spheres15
Fractional scene area coverage of spheres0.471
Sphere radius10.0 [m]
Minimum sphere center height11.0 [m]
Maximum sphere center height19.0 [m]

where the Leaf Area Index (LAI) is calculated as follows:

LAI = (# of leaves × one-sided area of single leaf) ⁄ (π × square of the radius of sphere)

An ASCII file with the radius (R), centre coordinates (Xc,Yc,Zc), and direction cosines (Dx,Dy,Dz) of every single leaf in a spherical volumes centered at 0,0,0 can be found here. This file (is ~ 2.2 Mbytes and) contains 49999 lines of format R Xc Yc Zc Dx Dy Dz and may serve as input to your scene creation process (provided that you are able to create multiple instances of its content, each one of which is then translated to the actual locations of the sphere centers in the scene. The coordinates (X, Y, Z) of the various sphere centers are as follows:

−24.8302; 11.6110; 15.6210−38.3380; −9.06342; 17.6094−31.3562; 32.5297; 14.3051
11.9126; 8.32062; 12.122039.4855; 37.1247; 16.3647−8.30999; −4.39422; 14.4241
12.2769; −25.1402; 12.449232.4756; −26.9023; 16.3684−7.46991; −32.2138; 12.6678
−27.4794; −32.0266; 15.914633.5709; −6.31039; 14.5332−5.24326; 39.8405; 16.8247
18.1699; 35.8223; 11.5683−5.26569; 18.9618; 17.253537.8226; 14.6769; 11.5936

The underlying soil is occupying the entire lower surface of the scene, i.e., the area enclosed between the following coordinates: (−50.0, −50.0, 0.0), (−50.0, +50.0, 0.0), (+50.0, −50.0, 0.0), and (+50.0, +50.0, 0.0), where all values are in meters.

The tables below provide the details required to execute each of the experiments in this category. Every table is preceeded by the corresponding experiment identifier tag that is needed in the naming of the various measurement results files (see file naming and formatting conventions).