# gcIntersect

From geosphere v1.2-15
by Robert Hijmans

##### Intersections of two great circles

Get the two points where two great cricles cross each other. Great circles are defined by two points on it.

- Keywords
- spatial

##### Usage

`gcIntersect(p1, p2, p3, p4)`

##### Arguments

- p1
- Longitude/latitude of a single point, 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
- p3
- As above
- p4
- As above

##### Value

- two points for each pair of great circles

##### References

##### See Also

##### Examples

```
p1 <- c(5,52); p2 <- c(-120,37); p3 <- c(-60,0); p4 <- c(0,70)
gcIntersect(p1,p2,p3,p4)
```

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

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