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

View source: R/gcIntersectBearing.R

Get the two points where two great cricles cross each other. In this function, great circles are defined by a points and an initial bearing. In function ` gcIntersect`

they are defined by two sets of points.

1 | ```
gcIntersectBearing(p1, brng1, p2, brng2)
``` |

`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 |

`brng1` |
Bearing from p1 |

`p2` |
As above. Should have same length as p1, or a single point (or vice versa when p1 is a single point |

`brng2` |
Bearing from p2 |

a matrix with four columns (two points)

Chris Veness and Robert Hijmans based on code by Ed Williams

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

http://www.movable-type.co.uk/scripts/latlong.html

1 | ```
gcIntersectBearing(c(10,0), 10, c(-10,0), 10)
``` |

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