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    <p>The following code has served me well. Customize it a little and you are done. <a href="http://files.eduardoleoni.com/map.png">alt text http://files.eduardoleoni.com/map.png</a></p> <pre><code>library(maptools) substitute your shapefiles here state.map &lt;- readShapeSpatial("BRASIL.shp") counties.map &lt;- readShapeSpatial("55mu2500gsd.shp") ## this is the variable we will be plotting counties.map@data$noise &lt;- rnorm(nrow(counties.map@data)) </code></pre> <p>heatmap function</p> <pre><code>plot.heat &lt;- function(counties.map,state.map,z,title=NULL,breaks=NULL,reverse=FALSE,cex.legend=1,bw=.2,col.vec=NULL,plot.legend=TRUE) { ##Break down the value variable if (is.null(breaks)) { breaks= seq( floor(min(counties.map@data[,z],na.rm=TRUE)*10)/10 , ceiling(max(counties.map@data[,z],na.rm=TRUE)*10)/10 ,.1) } counties.map@data$zCat &lt;- cut(counties.map@data[,z],breaks,include.lowest=TRUE) cutpoints &lt;- levels(counties.map@data$zCat) if (is.null(col.vec)) col.vec &lt;- heat.colors(length(levels(counties.map@data$zCat))) if (reverse) { cutpointsColors &lt;- rev(col.vec) } else { cutpointsColors &lt;- col.vec } levels(counties.map@data$zCat) &lt;- cutpointsColors plot(counties.map,border=gray(.8), lwd=bw,axes = FALSE, las = 1,col=as.character(counties.map@data$zCat)) if (!is.null(state.map)) { plot(state.map,add=TRUE,lwd=1) } ##with(counties.map.c,text(x,y,name,cex=0.75)) if (plot.legend) legend("bottomleft", cutpoints, fill = cutpointsColors,bty="n",title=title,cex=cex.legend) ##title("Cartogram") } </code></pre> <p>plot it</p> <pre><code>plot.heat(counties.map,state.map,z="noise",breaks=c(-Inf,-2,-1,0,1,2,Inf)) </code></pre>
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    1. COoh that looks really great! I was hoping someone had a code example like this. Thanks!
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    2. COhot damn! now with pictures!
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    3. COWhere can you get the .shp files? I need one for the Netherlands, but can't find it
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