Intersections of two great circles
Get the two points where two great cricles cross each other. In this function, great circles are defined by a points and an initial bearing. In function gcIntersect they are defined by two sets of points.
gcIntersectBearing(p1, brng1, p2, brng2)
p1 |
longitude/latitude of point(s). Can be a vector of two numbers, a matrix of 2 columns (first one is longitude, second is latitude) or a SpatialPoints* object |
brng1 |
Bearing from p1 |
p2 |
As above. Should have same length as p1, or a single point (or vice versa when p1 is a single point |
brng2 |
Bearing from p2 |
a matrix with four columns (two points)
Chris Veness and Robert Hijmans based on code by Ed Williams
gcIntersectBearing(c(10,0), 10, c(-10,0), 10)
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