# horizon

0th

Percentile

##### 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.

Keywords
spatial
##### Usage
horizon(h, r=6378137)
##### Arguments
h
altitude, numeric >= 0. Should have the same unit as r
r
radius of the earth; default value is 6378137 m
##### Value

• Distance in units of h (default is meters)

##### References

http://williams.best.vwh.net/avform.htm#Horizon Bowditch, 1995. American Practical Navigator. Table 12.

• horizon
##### Examples
horizon(1.80) # me
horizon(324)  # Eiffel tower
Documentation reproduced from package geosphere, version 1.2-15, License: GPL

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