gcIntersectBearing function

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. 1.1

gcIntersectBearing(p1, brng1, p2, brng2)

Arguments

• 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

Returns

a matrix with four columns (two points)

See Also

gcIntersect

References

https://www.edwilliams.org/avform147.htm#Intersection

https://www.movable-type.co.uk/scripts/latlong.html

Author(s)

Chris Veness and Robert Hijmans based on code by Ed Williams

Examples

gcIntersectBearing(c(10,0), 10, c(-10,0), 10)