HORIZON_DIST Name
HORIZON_DIST Purpose
Compute distance to horizon given observer height.
Category
Calling Sequence
d = horizon_dist(ht) Inputs
h = Observer height. in
Keyword Parameters
Keywords
/GEOM return geometric horizon, else refracted.
Perhaps better for large heights.
/FEET Observer height is in feet, else meters.
/NMILES Distance is in nautical miles, else km.
RADIUS=rad Enter Earth radius to use (km, def=6371).
REFCON=rc Refraction constant (def=7/6).
Outputs
d = Distance to horizon. out Common Blocks
Notes
Notes: Distance is from the observer to the horizon,
not along the surface. Refraction is approximated
by using an earth radius of 7/6 times the actual
earth radius. Refraction is variable but this is
a typical value and commonly used.
Ref: http://mintaka.sdsu.edu/GF/explain/atmos_refr/horizon.html
Modification History
R. Sterner, 2006 Apr 19
Copyright (C) 2006, Johns Hopkins University/Applied Physics Laboratory
This software may be used, copied, or redistributed as long as it is not
sold and this copyright notice is reproduced on each copy made. This
routine is provided as is without any express or implied warranties
whatsoever. Other limitations apply as described in the file disclaimer.txt.