RFM Flags

GEO Flag: Use Geometric Paths

23AUG18

Enabled
Ignore refraction effects when ray-tracing

Disabled
Allow for refraction

Restrictions
Incompatible with HOM, NAD, TAB and ZEN Flags.

Notes
  1. This Flag effectively sets the refractive index (calculated in refrac_fnc.f90) to unity, although in practice there are switches in the ray-tracing code for the non-refractive case.
  2. Incompatible with viewing geometries that don't involve a spherical atmosphere (since these have no refraction effects)
  3. This Flag should not be confused with the *GEO alternative to the *TAN section which specifies tangent paths by their projected geometric tangent points, but for which refraction is still considered.

Bugs
[no recent bugs]