onGreatCircle function

Is a point on a given great circle?

Test if a point is on a great circle defined by two other points. 1.1

onGreatCircle(p1, p2, p3, tol=0.0001)

Arguments

• p1: Longitude/latitude of the first point defining a great circle, 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 for the second point
• p3: the point(s) to be tested if they are on the great circle or not
• tol: numeric. maximum distance from the great circle (in degrees) that is tolerated to be considered on the circle

Returns

logical

Author(s)

Robert Hijmans

Examples

onGreatCircle(c(0,0), c(30,30), rbind(c(-10 -11.33812), c(10,20)))