BRF in the principal plane for multiple-scattered (two or more scattering events) radiation
Within RAMI the Bi-directional Reflectance Factor (BRF) at a specific wavelength is defined as the radiant flux exiting from a target area in a particular direction - passing through a planar reference surface of specified lateral dimension and elevation above the target, and oriented perpendicular to the underlying surface normal - normalized by the equivalent quantity leaving from an infinitely large Lambertian background via the same reference surface and for the same directions of illumination and reflectance.
For this particular measurement the component of the surface leaving radiation that has interacted twice or more with the scatterers in the scene is utilized to compute the BRFs. Measurements are required at 2 degree intervals of the view zenith angle covering the range -75 degree to 75 degree in the principal plane. Although singular directions are preferred, it is left to the RAMI participants to choose the solid angle over which to integrate the exiting radiation, as long as they are centered at the above view zenith angles and duely indicated in the report file. The height of the reference surface is that of the top of the simulated scene and covers the entire extend of that scene - unless specified otherwise.
| Header line content | # rows | # columns in file | Ratio of filtered rays ** | ||
|---|---|---|---|---|---|
| Header line format | integer | integer | real | ||
| Body lines content | SZA [rad] | VZA [rad]* | SAA - VAA [rad]* | BRF | Std. Dev. BRF ** |
| Body lines format | real | real | real | real | real |
*: if not defined (i.e. measurement #10: brf1) set to -1.000000.
**: if available, otherwise set to -1.000000.
where
76 5 1.000000
0.349066 1.30900 0.00000 0.0318550 -1.00000
0.349066 1.27409 0.00000 0.0331900 -1.00000
0.349066 1.23918 0.00000 0.0348060 -1.00000
0.349066 1.20428 0.00000 0.0363330 -1.00000
0.349066 1.16937 0.00000 0.0375620 -1.00000
0.349066 1.13446 0.00000 0.0385920 -1.00000
0.349066 1.09956 0.00000 0.0397190 -1.00000
0.349066 1.06465 0.00000 0.0410810 -1.00000
0.349066 1.02974 0.00000 0.0423890 -1.00000
0.349066 0.994838 0.00000 0.0435390 -1.00000
0.349066 0.959931 0.00000 0.0447860 -1.00000
0.349066 0.925025 0.00000 0.0462140 -1.00000
0.349066 0.890118 0.00000 0.0478770 -1.00000
0.349066 0.855211 0.00000 0.0495160 -1.00000
0.349066 0.820305 0.00000 0.0511630 -1.00000
0.349066 0.785398 0.00000 0.0529240 -1.00000
0.349066 0.750492 0.00000 0.0548090 -1.00000
0.349066 0.715585 0.00000 0.0567510 -1.00000
0.349066 0.680678 0.00000 0.0587880 -1.00000
0.349066 0.645772 0.00000 0.0609030 -1.00000
0.349066 0.610865 0.00000 0.0630250 -1.00000
0.349066 0.575959 0.00000 0.0651330 -1.00000
0.349066 0.541052 0.00000 0.0672560 -1.00000
0.349066 0.506145 0.00000 0.0693480 -1.00000
0.349066 0.471239 0.00000 0.0713570 -1.00000
0.349066 0.436332 0.00000 0.0733290 -1.00000
0.349066 0.401426 0.00000 0.0753520 -1.00000
0.349066 0.366519 0.00000 0.0780020 -1.00000
0.349066 0.331613 0.00000 0.0781930 -1.00000
0.349066 0.296706 0.00000 0.0760380 -1.00000
0.349066 0.261799 0.00000 0.0746460 -1.00000
0.349066 0.226893 0.00000 0.0733490 -1.00000
0.349066 0.191986 0.00000 0.0720180 -1.00000
0.349066 0.157080 0.00000 0.0705980 -1.00000
0.349066 0.122173 0.00000 0.0692120 -1.00000
0.349066 0.0872660 0.00000 0.0678060 -1.00000
0.349066 0.0523600 0.00000 0.0664120 -1.00000
0.349066 0.0174530 0.00000 0.0649570 -1.00000
0.349066 0.0174530 3.14159 0.0635900 -1.00000
0.349066 0.0523600 3.14159 0.0622220 -1.00000
0.349066 0.0872660 3.14159 0.0608960 -1.00000
0.349066 0.122173 3.14159 0.0595980 -1.00000
0.349066 0.157080 3.14159 0.0583490 -1.00000
0.349066 0.191986 3.14159 0.0570660 -1.00000
0.349066 0.226893 3.14159 0.0558280 -1.00000
0.349066 0.261799 3.14159 0.0546520 -1.00000
0.349066 0.296706 3.14159 0.0535960 -1.00000
0.349066 0.331613 3.14159 0.0525710 -1.00000
0.349066 0.366519 3.14159 0.0516000 -1.00000
0.349066 0.401426 3.14159 0.0507040 -1.00000
0.349066 0.436332 3.14159 0.0498600 -1.00000
0.349066 0.471239 3.14159 0.0490250 -1.00000
0.349066 0.506145 3.14159 0.0482400 -1.00000
0.349066 0.541052 3.14159 0.0475100 -1.00000
0.349066 0.575959 3.14159 0.0467890 -1.00000
0.349066 0.610865 3.14159 0.0460820 -1.00000
0.349066 0.645772 3.14159 0.0454600 -1.00000
0.349066 0.680678 3.14159 0.0448800 -1.00000
0.349066 0.715585 3.14159 0.0444000 -1.00000
0.349066 0.750492 3.14159 0.0439090 -1.00000
0.349066 0.785398 3.14159 0.0435120 -1.00000
0.349066 0.820305 3.14159 0.0429350 -1.00000
0.349066 0.855211 3.14159 0.0422260 -1.00000
0.349066 0.890118 3.14159 0.0414320 -1.00000
0.349066 0.925025 3.14159 0.0405360 -1.00000
0.349066 0.959931 3.14159 0.0395850 -1.00000
0.349066 0.994838 3.14159 0.0385190 -1.00000
0.349066 1.02974 3.14159 0.0371720 -1.00000
0.349066 1.06465 3.14159 0.0357990 -1.00000
0.349066 1.09956 3.14159 0.0343750 -1.00000
0.349066 1.13446 3.14159 0.0329370 -1.00000
0.349066 1.16937 3.14159 0.0313050 -1.00000
0.349066 1.20428 3.14159 0.0297510 -1.00000
0.349066 1.23918 3.14159 0.0283090 -1.00000
0.349066 1.27409 3.14159 0.0266780 -1.00000
0.349066 1.30900 3.14159 0.0255550 -1.00000
Prior to the performing of any RT model simulations, please refer to the
Radiative transfer simulation definitions page located under the ROMC Info
menu in the top navigation bar. Here you may find
detailed instructions regarding the angular sign conventions for BRF
simulations, as well as precise definitions of the required leaf
normal distributions, the location and extend of the reference plane
and other RT model technicalities. Also read the relevant
file naming and formatting conventions that must be adhered to in order to
avoid rejection of your results by the ROMC format checker.
Further information may also be found in the FAQs.