RFM Flags: Calculate Absorption Coefficients for every Path Segment
CLC Flag



04SEP22
 Enabled
 Absorption coefficients for each gas in each path segment are
calculated according to local CurtisGodson parameters
 Separate raypath calculated for each distinct ray required for
FOV convolution
 Disabled
 Absorption coefficients for path segments with similar Curtis Godson
p,T parameters will be grouped together in a single calculation
 Rays for FOV convolutions may be approximated by other rays
with similar tangent altitude.
 Restrictions
 Incompatible with HOM,
NAD,
TAB and
ZEN Flags (see Note 3)
 Notes
 Enabling this flag will require significantly more CPU time and
memory.
 The main purpose of this section is to check that the normally
reasonable approximations made in the RFM by default do not significantly
affect the results.
 Restrictions: in the case of the
TAB and
HOM
Flags,
specific absorption coefficients for each path are calculated
by definition.
For a planeparallel atmosphere
(NAD and
ZEN Flags) the CurtisGodson parameters,
hence absorption coefficients per unit absorber,
are already mathematically identical for all viewing angles
 Bugs
 [none recently]