bearing | R Documentation |

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`

).

bearing(p1, p2, a=6378137, f=1/298.257223563)

`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 |

Bearing in degrees

use `f=0`

to get a bearing on a sphere (great circle)

Robert Hijmans

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

` bearingRhumb `

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

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