midPoint: Mid-point

In geosphere: Spherical Trigonometry

Description

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

Usage

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

Value

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)  

Example output

Loading required package: sp
     lon      lat
[1,]   0 45.14432
     lon lat
[1,]   0  45

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