Hi Julia,

I use the 'maps' library.  Here I've simulated data and stored it in the
variables 'x' and 'y'.  You'll want to use your lat and long instead.

> library(maps)
> map("world")
> map("world", xlim=c(-10,40), ylim=c(20, 70))
> x <- runif(n=20, min=-10, max=40)
> y <- runif(n=20, min=20, max=70)
> points(x,y, pch=21, bg="blue")

Good luck!
Brian Knaus

On Wed, Jan 27, 2010 at 7:17 AM, Tammy Wilson <t.w@aggiemail.usu.edu> wrote:

> Hi Julia,
>
> I have found that the easiest way to display geographic data in R is
> to use a projected coordinate system (like Universal Transverse
> Mercator). You can then use plot (x,y) to display a scatterplot of
> your points.
> The resulting map isn't pretty, but it lets you visualize the data.
> The following packages have limited cartographic and map projection
> capabilities: maps, mapproj, maptools
>
> Also, the GIS program GRASS is free and quite functional.
> http://grass.osgeo.org/
>
> Tammy
>
> On Wed, Jan 27, 2010 at 2:28 AM, Julia Tchernova <tchernova@npolar.no>
> wrote:
> > Hello!
> > I have a dataset with the date and positions -  Lat and Long columns
> > How do I make a scatter  plot?
> > Do I have to cbind the Lat and Long columns?
> > Any suggestions will be much appreciated!
> > Thank you
> > Julia
> >
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> >
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> >
>
>
>
> --
> Tammy L. Wilson
> Doctoral Candidate
> Department of Wildland Resources
> Utah State University
> 5230 Old Main Hill
> Logan, UT 84322-5230
> t.w@aggiemail.usu.edu
> 435.797.3892
>
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> R-sig-ecology@r-project.org
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