coord_map {ggplot2}R Documentation

coord_map

Description

Map projections

Usage

coord_map(projection="mercator", orientation=NULL, fast=TRUE, ...)

Arguments

projection projection to use, see ?mapproject for complete list
orientation orientation, which defaults to c(90, 0, mean(range(x))). This is not optimal for many projections, so you will have to supply your own.
fast NULL
... other arguments passed on to mapproject

Details

This coordinate system provides the full range of map projections available in the mapproj package.

This is still experimental, and if you have any advice to offer regarding a better (or more correct) way to do this, please let me know

This page describes coord_map, see layer and qplot for how to create a complete plot from individual components.

Value

A layer

Author(s)

Hadley Wickham, http://had.co.nz/

See Also

Examples

## Not run: 
try_require("maps")
# Create a lat-long dataframe from the maps package
nz <- data.frame(map("nz", plot=FALSE)[c("x","y")])
(nzmap <- qplot(x, y, data=nz, geom="path"))

nzmap + coord_map()
nzmap + coord_map(project="cylindrical")
nzmap + coord_map(project='azequalarea',orientation=c(-36.92,174.6,0))

states <- data.frame(map("state", plot=FALSE)[c("x","y")])
(usamap <- qplot(x, y, data=states, geom="path"))
usamap + coord_map()
# See ?mapproject for coordinate systems and their parameters
usamap + coord_map(project="gilbert")
usamap + coord_map(project="lagrange")

# For most projections, you'll need to set the orientation yourself
# as the automatic selection done by mapproject is not available to
# ggplot
usamap + coord_map(project="orthographic")
usamap + coord_map(project="stereographic")
usamap + coord_map(project="conic", lat0 = 30)
usamap + coord_map(project="bonne", lat0 = 50)
## End(Not run)

[Package ggplot2 version 0.8.2 Index]