5.7.3 Mapping Based on the Semiovariogram (Kriging)

# Fig. 5.9.: Kriging of As_C with different resolution library(StatDA) data(chorizon) data(kola.background) data(bordersKola) # Packages for Krige results: X=chorizon[,"XCOO"] Y=chorizon[,"YCOO"] # true representation of x and y axis of map for plot xwid=diff(range(X))/12e4 ywid=diff(range(Y))/12e4 pdf("fig-5-9.pdf",width=2*xwid,height=1*ywid) par(mfrow=c(1,2),mar=c(1.5,1.5,1.5,1.5)) # As in C-horizon el=chorizon[,"As"] # Fit variogram for data with non-standardized distance: vario.b <- variog(coords=cbind(X,Y), data=el, lambda=0, max.dist=300000) #res.eyefit=eyefit(vario.b) #dump("res.eyefit","../Data/res.eyefit.As_C_m") data(res.eyefit.As_C_m) v5=variofit(vario.b,res.eyefit.As_C_m,cov.model="spherical",max.dist=300000) ###################################################################################### # NEW Krige map: percentile scale # generate plot plot(X,Y,frame.plot=FALSE,xaxt="n",yaxt="n",xlab="",ylab="",type="n") KrigeLegend(X,Y,el,resol=25,vario=v5,type="percentile",whichcol="gray", qutiles=c(0,0.05,0.25,0.50,0.75,0.90,0.95,1),border="bordersKola", leg.xpos.min=7.8e5,leg.xpos.max=8.0e5,leg.ypos.min=77.6e5,leg.ypos.max=78.7e5, leg.title="mg/kg", leg.title.cex=0.7, leg.numb.cex=0.7, leg.round=2, leg.numb.xshift=0.7e5,leg.perc.xshift=0.4e5,leg.perc.yshift=0.2e5,tit.xshift=0.35e5) # plot background plotbg(map.col=c("gray","gray","gray","gray"),map.lwd=c(1,1,1,1),add.plot=T) # Text text(min(X)+diff(range(X))*4/7,max(Y),"As",cex=1) text(min(X)+diff(range(X))*4/7,max(Y)-diff(range(Y))/28,"in C-horizon",cex=0.8) # scalebar scalebar(761309,7373050,861309,7363050,shifttext=-0.5,shiftkm=37e3,sizetext=0.8) # North arrow Northarrow(362602,7818750,362602,7878750,362602,7838750,Alength=0.15,Aangle=15,Alwd=1.3,Tcex=1.6) ###################################################################################### # NEW Krige map: percentile scale # generate plot plot(X,Y,frame.plot=FALSE,xaxt="n",yaxt="n",xlab="",ylab="",type="n") KrigeLegend(X,Y,el,resol=100,vario=v5,type="percentile",whichcol="gray", qutiles=c(0,0.05,0.25,0.50,0.75,0.90,0.95,1),border="bordersKola", leg.xpos.min=7.8e5,leg.xpos.max=8.0e5,leg.ypos.min=77.6e5,leg.ypos.max=78.7e5, leg.title="mg/kg", leg.title.cex=0.7, leg.numb.cex=0.7, leg.round=2, leg.numb.xshift=0.7e5,leg.perc.xshift=0.4e5,leg.perc.yshift=0.2e5,tit.xshift=0.35e5) # plot background plotbg(map.col=c("gray","gray","gray","gray"),map.lwd=c(1,1,1,1),add.plot=T) # Text text(min(X)+diff(range(X))*4/7,max(Y),"As",cex=1) text(min(X)+diff(range(X))*4/7,max(Y)-diff(range(Y))/28,"in C-horizon",cex=0.8) # scalebar scalebar(761309,7373050,861309,7363050,shifttext=-0.5,shiftkm=37e3,sizetext=0.8) # North arrow Northarrow(362602,7818750,362602,7878750,362602,7838750,Alength=0.15,Aangle=15,Alwd=1.3,Tcex=1.6) dev.off()