coord_map

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

Map projections

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.

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Parameters

Parameters control the appearance of the coord. In addition to the parameters listed below (if any), any aesthetic can be used as a parameter, in which case it will override any aesthetic mapping.

projection: projection to use, see ?mapproject for complete list
...: other arguments passed on to mapproject
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

Returns

This function returns a coordinate system object.

Examples

> 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)

What do you think of the documentation? Please let me know by filling out this short online survey.