# onGreatCircle

From geosphere v1.2-15
by Robert Hijmans

##### Is a point on a given great circle?

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

- Keywords
- spatial

##### Usage

`onGreatCircle(p1, p2, p3)`

##### Arguments

- p1
- Longitude/latitude of the first point definging 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

##### Value

- logical

##### Examples

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

*Documentation reproduced from package geosphere, version 1.2-15, License: GPL*

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