R: Rhumbline direction

bearingRhumb {geosphere} | R Documentation

## Rhumbline direction

### Description

Bearing (direction of travel; true course) along a rhumb line (loxodrome) between two points.

### Usage

    bearingRhumb(p1, p2)

### Arguments

`p1` | longitude/latitude of point(s). Can be a vector of two numbers, a matrix of 2 columns (first one is longitude, second is latitude) or a SpatialPoints* object
`p2` | as above

### Value

A direction (bearing) in degrees

### Note

Unlike most great circles, a rhumb line is a line of constant bearing (direction), i.e. tracks of constant true course. The meridians and the equator are both rhumb lines and great circles. Rhumb lines approaching a pole become a tightly wound spiral.

### Author(s)

Chris Veness and Robert Hijmans, based on formulae by Ed Williams

### References

http://williams.best.vwh.net/avform.htm#Rhumb

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

### See Also

`bearing, distRhumb`

### Examples

    bearingRhumb(c(10,10),c(20,20))

[Package geosphere version 1.5-5 Index]