# mercator

From geosphere v1.2-15
by Robert Hijmans

##### Mercator projection

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.

- Keywords
- spatial

##### 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

##### Examples

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

*Documentation reproduced from package geosphere, version 1.2-15, License: GPL*

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