[R-sig-Geo] Polar mapping

[Roger Bivand]

On Wed, 22 Feb 2006, Anne Hertel wrote:

> Hi,
> 
> I have some geographical data for the Northern Hemisphere. It is a
> rectangular matrix with longitudes and latitudes. I would like to plot
> that so the resulting plot is a circle centered on the North Pole with
> contours, so you only see the Northern Hemisphere. Also I would like to
> overlay that with a map of the Northern Hemisphere continents. Does
> anybody know if it is possible to create plots like that in R?

If the image at the foot of the spproj section of this:

http://r-spatial.sourceforge.net/xtra/xtra.RHnw.html

is anything like what you need, you'll see some code there for projecting 
an image (by making the rectangular grid cells into polygons). Projecting 
contours should work too - create them as a SpatialLinesDataFrame first 
with for example sp function contourLines2SLDF().

Which platform are you using? The spproj functions will soon(ish) become 
available in the rgdal package, which may make things easier.

> 
> Thanks Anne Hertel
> 
> 
> ------------------------------------------------------------
> Anne M. K. Hertel
> Grad. Student & Research Assistant
> Department of Atmospheric Sciences
> University of Illinois at Urbana-Champaign
> Annex II, room 204
> Phone: (217) 333 6296
> 
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> 

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no