[R] Map Antarctica

Michael Sumner mdsumner at gmail.com
Thu Jun 6 02:57:26 CEST 2013

You have mixed your x with your y, try this:


I tend not to use maps/mapdata if I can help it (there are problems as
you can see, though there is support for projections with mapproject,
see ?map), if you want to use an alternative try this.

## select out just the continent
antarctica <-  wrld_simpl[wrld_simpl$NAME == "Antarctica", ]

For a better display of this part of the world

## define a sensible projection
pr <- "+proj=laea +lat_0=-90 +ellps=WGS84 +datum=WGS84 +no_defs +towgs84=0,0,0"
antarctica.laea <- spTransform(antarctica, CRS(pr))


Removing the dud coordinates at -90 is a bit more difficult, but can
be done (the first plot by map() has a similar problem).

There is a mailing list R-Sig-Geo which is more topical for questions
like this if you want to explore further.

Cheers, Mike.

On Wed, Jun 5, 2013 at 11:00 PM, ejb <ejb274 at psu.edu> wrote:
> Hey, I'm new with R and I'm attempting to map and then plot points on a map
> of Antarctica with help from some code at the following link.  Link
> <http://www.molecularecologist.com/2012/09/making-maps-with-r/>
> After downloading the packages here is the code I used. I feel like the
> problem has to do with the coordinates since I get a very small image that
> appears to be only a small portion of the continent (I want the whole
> thing). Thanks in advance!
> library(maps)
> library(mapdata)
> map("worldHires","Antarctica",xlim=c(-90,-60),ylim=c(-180,180),col="gray90",fill=TRUE)
> --
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Michael Sumner
Hobart, Australia
e-mail: mdsumner at gmail.com

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