Hi: A couple of things:
(1) It's coord_equal(), not coord-equal() in ggplot2. (2) For those who want to use Google Maps, I'll just mention that there is an RgoogleMaps package with a nice vignette on CRAN. HTH, Dennis On Tue, Aug 24, 2010 at 3:17 PM, Pierre Roudier <pierre.roud...@gmail.com>wrote: > Hello Thiago, > > First, I owe you and the list a reproducible example (my first example > does not run properly - my bad): > > dat <- data.frame(x=runif(50), y=runif(50), > category=sample(letters[1:3], size=50, replace=TRUE), > continuous=runif(50)) > # You may want to do some spatial analysis on that data.frame > library(sp) > coordinates(dat) <- ~x+y > # Some spatial analysis here > > # Now you want to plot it > library(ggplot2) > df <- as.data.frame(dat) # backtransforms dat into a data.frame object > (ggplot2 does not handle sp objects) > # Here I chose to plot the continuous variable with the size of the > bubbles, and the categorical variable with the colours > my.plot <- ggplot(data=df, aes(x=x, y=y)) + > geom_point(aes(size=continuous, colour=category)) + coord-equal() > print(my.plot) > > Second, about plotting a shape file: yes, it is possible. Consider > this blog entry for example: > > http://blog.revolutionanalytics.com/2009/11/choropleth-challenge-result.html > > Basically, you want to use either geom_path() for simple state > boundaries, or geom_polygon() for polygons (e.g. you want to map some > attribute by state). > > Sorry I haven't much experience with this. That could be a good > question on the ggplot2 mailing list > (http://groups.google.com/group/ggplot2). > > Pierre > > > 2010/8/25 Thiago Veloso <thi_vel...@yahoo.com.br>: > > Hello, Matthew. > > Just a superb complement of yours. > > I was about to ask the same question to Pierre and Paul, after thanking > them for the useful and functional tip. I managed to follow the ggplot > examples, but a next step would involve plotting my interest points over a > shape file (state contour). > > Is that possible? > > Best wishes, > > Thiago. > > > > --- On Tue, 24/8/10, Matthew Landis <lan...@isciences.com> wrote: > > > > From: Matthew Landis <lan...@isciences.com> > > Subject: Re: [R-sig-Geo] Mapping multiple attributes at once > > To: r-sig-geo@stat.math.ethz.ch > > Date: Tuesday, 24 August, 2010, 11:47 > > > > I've been following this topic with some interest, since this is > something I might like to do fairly often. I'm not that familiar with > ggplot2, but it looks really useful. Is there a way to overplot (or > underplot) a shapefile (e.g. of coastlines) with the approach suggested by > Paul? > > > > Matt > > > > On 8/24/2010 10:25 AM, Paul Hiemstra wrote: > >> In addition to the reply by Pierre Roudier, take a look at the ggplot2 > >> pacakge. An example: > >> > > > > > > -- ~~~~~~~~~~~~~~~~~~~~~~~~~~ > > Matthew Landis, Ph.D. > > Research Scientist > > ISciences, LLC > > 61 Main St. Suite 200 > > Burlington VT 05401 > > 802.864.2999 > > ~~~~~~~~~~~~~~~~~~~~~~~~~~ > > > > _______________________________________________ > > R-sig-Geo mailing list > > R-sig-Geo@stat.math.ethz.ch > > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > > > > > > > > > > [[alternative HTML version deleted]] > > > > > > _______________________________________________ > > R-sig-Geo mailing list > > R-sig-Geo@stat.math.ethz.ch > > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > > > > > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
