RFM Flags

GRA Flag: Horizontal Gradients

05AUG17

Enabled
Use 2D ray-tracing algorithm
*ATM section: each .atm file requires (optional from RFM v4.33 onwards) a horizontal angle (PSI) qualifier.
*NTE section: (RFM v4.33 onwards) each .nte file may also have a horizontal angle (PSI) qualifier.
*OBS section: Observer location requires a horizontal angle PSIOBS
.pth file: horizontal gradient information added to path diagnostics.

Disabled
Use 1D ray-tracing algorithm
*ATM section: ignore any horizontal angles
*NTE section: ignore any horizontal angles
*OBS section: ignore any horizontal angle

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

Notes
  1. Incompatible with viewing geometries that don't involve a spherical atmosphere.
  2. See *ATM section for further details.

Bugs
Bug#127 (Fixed v4.36)
Bug#21 (Fixed v4.11)
Bug#19 (Fixed v4.11)
Bug#13 (Fixed v4.11)