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Workspace Method propmat_clearskyAddFromLookup
Description
Extract gas absorption coefficients from lookup table.
This extracts the absorption coefficient for all species from the
lookup table, and adds them to the propagation matrix. Extraction is
for one specific atmospheric condition, i.e., a set of pressure,
temperature, and VMR values.
Some special species are ignored, for example Zeeman species and free
electrons, since their absorption properties are not simple scalars
and cannot be handled by the lookup table.
The interpolation order in T and H2O is given by abs_t_interp_order
and abs_nls_interp_order, respectively.
Extraction is done for the frequencies in f_grid. Frequency
interpolation is controlled by abs_f_interp_order. If this is zero,
then f_grid must either be the same as the internal frequency grid of
the lookup table (for efficiency reasons, only the first and last
element of f_grid are checked), or must have only a single element.
If abs_f_interp_order is above zero, then frequency is interpolated
along with the other interpolation dimensions. This is useful for
calculations with Doppler shift.
For Doppler calculations, you should generate the table with a
somewhat larger frequency grid than the calculation itself has, since
the Doppler shift will push the frequency grid out of the table range
on one side. Alternatively, you can set the input
parameter *extpolfac* to a larger value, to allow extrapolation at the
edges.
See also: propmat_clearskyAddOnTheFly.
Authors: Stefan Buehler, Richard Larsson
Synopsis
| propmat_clearskyAddFromLookup( | propmat_clearsky, abs_lookup, abs_lookup_is_adapted, abs_p_interp_order, abs_t_interp_order, abs_nls_interp_order, abs_f_interp_order, f_grid, rtp_pressure, rtp_temperature, rtp_vmr, extpolfac ) |
Variables