starting with Rmap
On Mon, 14 May 2007, Laurence Amilhat wrote:
thank you for your quick answer. By following your steps, I was able to plot the shapefile. But it didn't contain what I was expected: an european map.
Please do not drop list threads, please do include your code verbatim. I guess that you have a map of North Carolina (as distributed with the package). Your original question suggested that you have a shapefile of Europe already. If you do not have, do you need just a shoreline, or do you need country boundaries, and if so which boundaries, and from when? This thread may also be relevant: http://article.gmane.org/gmane.comp.lang.r.general/84644 Roger
Do you have any idea where I can found such a map? A map of europe that can be read in R, so I can plot more infos on it. thanks again, Laurence Amilhat. Roger Bivand a ?crit :
On Mon, 14 May 2007, Laurence Amilhat wrote:
Hello,
I am a beginner in R programming, so sorry for the low level of this post...
That's OK, everyone begins sometime ...
Perhaps you would find the information in the CRAN "Spatial" Task View
useful.
To read and plot a shapefile, I think that you may find the examples in
the help page of readShapePoly() in the maptools package helpful. This
package depends on the sp package, which provides classes for spatial
data. In your case:
list.files(pattern="shp$")
# will tell you if your shapefile is in the working directory
getinfo.shape("europe.shp")
# will tell you what kind of shapefile it is
europe <- readShapePoly("europe.shp", proj4string=CRS("+proj=longlat"))
# will read it
plot(europe)
# will plot it
Some of the work in the original Rmap package is now in the rgdal package,
so that if you need to project the data, you can go on to that package
later.
To plot information, simply overplot the outline map with you choice of
base graphics functions.
Roger
I would like to create a Europe map and plot some Informations on it, using lat/long coordinates. I've seen the Rmap project, which seems to do what I want. The thing is that I can't get started. I download the packages: maps, mapdata, spmaps, shapefiles I have a text file for the europe continent downloaded from the World data bank, but I don't know how to create a database that can be used by Rmap. So I tried with shapefiles, I have a shapefile for Europe, as is it noticed in the tutorial http://www.maths.lancs.ac.uk/Software/Rmap/ i tried:
>europe <- shapefile("europe.shp")
Erreur : impossible de trouver la fonction "shapefiles" = The function shapefile was not found. Do someone have an idea on what I am doing wrong, or know a good tutorial that can be helpfull for what I what to do. Many thanks, Laurence Amihat
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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