onGreatCircle: Is a point on a given great circle?

In geosphere: Spherical Trigonometry

Description

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

Usage

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

Value

logical

Author(s)

Robert Hijmans

Examples

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

Example output

[1] FALSE FALSE

geosphere documentation built on May 2, 2019, 5:16 p.m.