Distance to the horizon
Empirical function to compute the distance to the horizon from a given altitude. The earth is assumed to be smooth, i.e. mountains and other obstacles are ignored.
horizon(h, r=6378137)
h |
altitude, numeric >= 0. Should have the same unit as r |
r |
radius of the earth; default value is 6378137 m |
Distance in units of h (default is meters)
Robert J. Hijmans
Bowditch, 1995. American Practical Navigator. Table 12.
horizon(1.80) # me horizon(324) # Eiffel tower
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