Define a MYSTIC 2D AMBRALS BRDF input file.  

mc_ambrals_file file

 
AMBRALS is the Algorithm for Modeling[MODIS] Bidirectional Reflectance Anisotropies of the Land Surface by wanner97. See also http://www-modis.bu.edu/brdf/models.html. The format of the albedo file is:  

Nx Ny dx dy ix iy iso vol geo ...

 
where Nx and Ny are the number of grid boxes in x- and y-direction, dx and dy are the size of the pixels in km. In the second and the following lines the indices in x- and y-direction (ix=1…Nx; iy=1…Ny) and the three parameters iso, vol, and geo.

Optionally, it is now possibly to mix AMBRALS with Cox and Munk (CaM). To this end, the format of the albedo file is:  

Nx Ny dx dy ix iy iso vol geo isCaM ...

 
where isCaM is 1 if CaM shall be used in the pixel, and 0 if AMBRALS shall be used. In case of CaM, the values of iso, vol, and geo are ignored. Note that this will only work if the CaM parameters are set (that is as minimal configuration u10).