bearing

0th

Percentile

Direction of travel

Get the initial bearing (direction; azimuth) to go from point p1 to point p2 (in longitude/latitude) following the shortest path on an ellipsoid (geodetic). Note that the bearing of travel changes continuously while going along the path. A route with constant bearing is a rhumb line (see bearingRhumb).

Keywords
spatial
Usage
bearing(p1, p2, a=6378137, f=1/298.257223563)
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. Can also be missing, in which case the bearing is computed going from the first point to the next and continuing along the following points

a

major (equatorial) radius of the ellipsoid. The default value is for WGS84

f

ellipsoid flattening. The default value is for WGS84

Value

Bearing in degrees

Note

use f=0 to get a bearing on a sphere (great circle)

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

bearingRhumb

Aliases
  • bearing
Examples
# NOT RUN {
bearing(c(10,10),c(20,20))
# }
Documentation reproduced from package geosphere, version 1.5-10, License: GPL (>= 3)

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