mercator function

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. 1.1

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

Returns

matrix

Author(s)

Robert Hijmans

Examples

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