mercator: Mercator projection

In geosphere: Spherical Trigonometry

Description

Transform longitude/latiude points to the Mercator projection. The main purpose of this function is to compute centroids, and to illustrate rhumb lines in the vignette.

Usage

mercator(p, inverse=FALSE, r=6378137) 

Arguments

p	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
inverse	Logical. If TRUE, do the inverse projection (from Mercator to longitude/latitude
r	Numeric. Radius of the earth; default = 6378137 m

Value

matrix

Author(s)

Robert Hijmans

Examples

a = mercator(c(5,52))
a
mercator(a, inverse=TRUE)

Example output

Loading required package: sp
            x       y
[1,] 556597.5 6800125
     lon lat
[1,]   5  52

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