mercator

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.

 spatial 

Spherical trigonometry for geographic applications. That is, compute distances and related measures for angular (longitude/latitude) locations.

Robert Hijmans

geosphere

Spherical Trigonometry

Robert J. Hijmans

Charles Karney

Ed Williams

Chris Vennes

mercator function

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

Arguments

Author

Mercator projection — mercator

<dl>

 <dt>p</dt>
<dd>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</dd>

 <dt>inverse</dt>
<dd>Logical. If <code>TRUE</code>, do the inverse projection (from Mercator to longitude/latitude</dd>
 
 <dt>r</dt>
<dd>Numeric. Radius of the earth; default = 6378137 m</dd>
 
</dl>

mercator: Mercator projection

Description

Usage

Value

Arguments

Author

Examples