R: Final direction

finalBearing {geosphere} | R Documentation

## Final direction

### Description

Get the final direction (bearing) when arriving at `p2` after starting from `p1` and following the shortest path on an ellipsoid (following a geodetic) or on a sphere (following a great circle).

### Usage

    finalBearing(p1, p2, a=6378137, f=1/298.257223563, sphere=FALSE)

### Arguments

`p1` | longitude/latitude of point(s). Can be a vector of two numbers, a matrix of 2 columns (first column is longitude, second column is latitude) or a SpatialPoints* object
`p2` | as above
`a` | major (equatorial) radius of the ellipsoid. The default value is for WGS84
`f` | ellipsoid flattening. The default value is for WGS84
`sphere` | logical. If `TRUE`, the bearing is computed for a sphere, instead of for an ellipsoid

### Value

A vector of directions (bearings) in degrees

### Author(s)

This function calls GeographicLib code by C.F.F. Karney

### References

C.F.F. Karney, 2013. Algorithms for geodesics, J. Geodesy 87: 43-55. https://dx.doi.org/10.1007/s00190-012-0578-z. Addenda: http://geographiclib.sf.net/geod-addenda.html. Also see http://geographiclib.sourceforge.net/

### See Also

`bearing`

### Examples

    bearing(c(10,10),c(20,20))
    finalBearing(c(10,10),c(20,20))

[Package geosphere version 1.5-5 Index]