View source: R/onGreatCircle.R

onGreatCircle | R Documentation |

Test if a point is on a great circle defined by two other points.

onGreatCircle(p1, p2, p3, tol=0.0001)

`p1` |
Longitude/latitude of the first point defining a great circle, in degrees; 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 for the second point |

`p3` |
the point(s) to be tested if they are on the great circle or not |

`tol` |
numeric. maximum distance from the great circle (in degrees) that is tolerated to be considered on the circle |

logical

Robert Hijmans

onGreatCircle(c(0,0), c(30,30), rbind(c(-10 -11.33812), c(10,20)))

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