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Workspace Method DoitAngularGridsSet
Description
Sets the angular grids for DOIT calculation.
In this method the angular grids for a DOIT calculation are
specified. For down-looking geometries it is sufficient to define
*N_za_grid* and *N_aa_grid*. From these numbers equally spaced
grids are created and stored in the WSVs scat_za_grid and
scat_aa_grid.
For limb simulations it is important to use an optimized zenith
angle grid with a very fine resolution about 90 degrees. Such a grid can be
generated using doit_za_grid_optCalc. The filename of an optimized
zenith angle grid can be given as a keyword (*za_grid_opt_file*).
If a filename is given, the equidistant grid is used for the
calculation of the scattering integrals and the optimized grid is
applied for integration of the radiative transfer equation.
For down-looking cases no filename should be specified (za_grid_opt_file = "" )
Using only the equidistant grid makes sense to speed up the calculation.
Authors: Claudia Emde
Synopsis
Variables
| OUT | doit_za_grid_size | (Index) | Number of equidistant grid points of the zenith angle grid, defined from 0 to 180 deg, for the scattering integral calculation. |
| OUT | scat_aa_grid | (Vector) | Azimuthal angle grid. |
| OUT | scat_za_grid | (Vector) | Zenith angle grid. |
| GIN | N_za_grid | (Index) | Number of grid points in zenith angle grid. Recommended value is 19. |
| GIN | N_aa_grid | (Index) | Number of grid points in azimuth angle grid. Recommended value is 37. |
| GIN | za_grid_opt_file | (String) | Name of special grid for RT part. |