[R-sig-Geo] Standardise color bar for different automap plot

[hasnein]

Hi,

I am plotting interpolation result using autoPlot function of automap
package. As the interpolation values varies slightly from plot to plot, so
is the colorbar values as well. How can I make the colorbar with a standard
value so that all the plots are comparable with a single color bar?

I used the code as below:
******************************
cuts
<-seq(min(interpol.output$var1.pred),max(interpol.output$var1.pred),length.out=8)
cuts = round(cuts,digits=0)
col.regions = brewer.pal(length(cuts)+3-2, "YlOrRd")
a <- list("sp.points", pts, col= "red", pch = 16, cex = 1, lwd = 1)
automapPlot(interpol.output, "var1.pred", pretty=TRUE, sp.layout = list(a),
scales = list(draw=T),xlab = expression("Longitude"^o),            ylab =
expression("Latitude"^o), main = "Interpolated hydroperiods", spplot = NULL)
******************************



Any help would be very helpful, Thanks,

Hasnein



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