R: Mercator projection

mercator {geosphere} | R Documentation

## Mercator projection

### 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)

[Package geosphere version 1.5-5 Index]