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? 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
Polar mapping
2 messages · Anne Hertel, 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