GLOBE Terrain Extraction Routines
High Frequency (HF) models (2–30 MHz)
Irregular Terrain Model (ITM) (Longley–Rice) (20 MHz – 20 GHz)
IF–77 Wave Propagation Model (Gierhart–Johnson) (Air–Ground)
Millimeter–wave Propagation Model (MPM) (1 GHz – 1 THz)
