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POdiverging size scale ggplot2
 

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  1. POdiverging size scale ggplot2
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    <p>I am trying to map model/obs differences at locations in space. I have color mapped to the diff but I would also like to map size to diff. i'm currently mapping size to abs(diff) but it produces two different legends that I would like to combine. mapping size to diff creates small points for negative values and large points for positive values but I really only want the magnitude represented for over/under predictions. In case it makes a difference, I would also like the scales to be discrete. Thanks</p> <p>Some test data:</p> <pre><code>so.df=data.frame(lat=runif(50,33,43),long=runif(50,-112,-104),diff=runif(50,-2,2)) ggplot()+ geom_point(data=so.df,aes(x=long,y=lat,color=diff,size=abs(diff)),alpha=0.8)+ scale_color_gradient2(low='red',mid='white',high='blue',limits=c(-0.6,0.6),breaks=c(-0.6,-0.4,-0.2,-0.1,0,0.1,0.2,0.6))+ guides(color=guide_legend('SWE Differences (m)'),size=guide_legend('SWE Difference\nMagnitudes (m)'))+ coord_cartesian(xlim=c(-112.5,-104.25),ylim=c(33,44))+ theme_bw() </code></pre> <p>EDIT: to use a discrete color scale I'm using the following (open to suggestions)</p> <pre><code>so.df$cuts=cut_interval(so.df$diff,length=0.15) ggplot()+ geom_path(data=states,aes(x=long,y=lat,group=group),color='grey10')+ geom_point(data=so.df,aes(x=long,y=lat,color=cuts,size=abs(diff)),alpha=0.8)+ coord_cartesian(xlim=c(-112.5,-104.25),ylim=c(33,44))+ scale_colour_brewer(type='div',palette='RdYlBu')+ guides(color=guide_legend('SWE Differences (m)'),size=guide_legend('SWE Difference\nMagnitudes (m))+ theme_bw() </code></pre>
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