Description Usage Arguments Value Note Author(s) References See Also Examples

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

1 | ```
bearingRhumb(p1, p2)
``` |

`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 |

A direction (bearing) in degrees

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.

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

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

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

1 | ```
bearingRhumb(c(10,10),c(20,20))
``` |

```
[1] 43.9654
```

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