NCEP.loxodrome: Calculate the loxodrome angle between two points on Earth.

In RNCEP: Obtain, Organize, and Visualize NCEP Weather Data

Description

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

Usage

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 [e-mail]

References

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

Examples

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

Example output

Loading required package: maps
Warning message:
no DISPLAY variable so Tk is not available 
[1] 171.6189

RNCEP documentation built on July 1, 2020, 7:10 p.m.