bearingRhumb: Rhumbline direction

In geosphere: Spherical Trigonometry

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://www.edwilliams.org/avform.htm#Rhumb

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

See Also

bearing, distRhumb

Examples

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

Example output

[1] 43.9654

geosphere documentation built on May 2, 2019, 5:16 p.m.