midPoint function

Mid-point

Find the point half-way between two points along an ellipsoid 1.1

midPoint(p1, p2, a=6378137, f = 1/298.257223563)

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
• a: major (equatorial) radius of the ellipsoid
• f: ellipsoid flattening. The default value is for WGS84

Returns

matrix with coordinate pairs

Author(s)

Elias Pipping and Robert Hijmans

Examples

midPoint(c(0,0),c(90,90))  
midPoint(c(0,0),c(90,90), f=0)