geosphere (version 1.5-10)

gcIntersectBearing: Intersections of two great circles

Description

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.

Usage

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

Value

a matrix with four columns (two points)

References

http://www.edwilliams.org/avform.htm#Intersection

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

See Also

gcIntersect

Examples

Run this code
# NOT RUN {
gcIntersectBearing(c(10,0), 10, c(-10,0), 10)
# }

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