geosphere (version 1.2-15)

gcIntersect: Intersections of two great circles

Description

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

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

http://williams.best.vwh.net/intersect.htm

See Also

gcIntersectBearing

Examples

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

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