geosphere: mercator – R documentation

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mercator

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)

geosphere

Spherical Trigonometry

v1.5-10

GPL (>= 3)

Authors

Robert J. Hijmans [cre, aut], Ed Williams [ctb], Chris Vennes [ctb]

Initial release

2019-05-25