gcIntersect

0th

Percentile

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

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

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