Calculate the loxodrome angle between two points on Earth.

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Description

This function calculates the loxodrome angle (i.e rhumb line or constant compass heading) between two points on a sphere.

Usage

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NCEP.loxodrome(lat1,lat2,lon1,lon2)

Arguments

lat1

A numeric value giving the starting latitude in decimal degrees.

lat2

A numeric value giving the ending latitude in decimal degrees.

lon1

A numeric value giving the starting longitude in decimal degrees.

lon2

A numeric value giving the ending longitude in decimal degrees.

Details

This function calculates the loxodrome angle (i.e. rhumb line or constant compass heading) between two points on a sphere. Output is given in degrees from north.

Value

A numeric value indicating the loxodrome angle between the two input points in degrees from north.

Author(s)

Michael U. Kemp mukemp+RNCEP@gmail.com

References

http://en.wikipedia.org/wiki/Rhumb_line

Examples

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library(RNCEP)
## Using NCEP.loxodrome ##
NCEP.loxodrome(lat1=45,lat2=40,lon1=4,lon2=5)