greatCircle function

Great circle

Get points on a great circle as defined by the shortest distance between two specified points 1.1

greatCircle(p1, p2, n=360, sp=FALSE)

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
• p2: as above
• n: The requested number of points on the Great Circle
• sp: Logical. Return a SpatialLines object?

Returns

A matrix of points, or a list of such matrices (e.g., if multiple bearings are supplied)

References

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

Author(s)

Robert Hijmans, based on a formula provided by Ed Williams

Examples

greatCircle(c(5,52), c(-120,37), n=36)