The gstat Package - NexTag Supports Open Source Initiatives

spplot.vcov 43Examplesdata(sic2004)# FIGURE 1. Locations of the 200 monitoring stations for the 11 data sets.# The values taken by the variable are known.plot(y~x,sic.train,pch=1,col="red", asp=1)# FIGURE 2. Locations of the 808 remaining monitoring stations at which# the values of the variable must be estimated.plot(y~x,sic.pred,pch="?", asp=1, cex=.8) # Figure 2# FIGURE 3. Locations of the 1008 monitoring stations (exhaustive data sets).# Red circles are used to estimate values located at the questions marksplot(y~x,sic.train,pch=1,col="red", asp=1)points(y~x, sic.pred, pch="?", cex=.8)spplot.vcovPlot map matrix of prediction error variances and covariancesDescriptionPlot map matrix of prediction error variances and covariancesUsagespplot.vcov(x, ...)ArgumentsxObject of class SpatialPixelsDataFrame or SpatialGridDataFrame, resulting froma krige call with multiple variables (cokriging... remaining arguments passed to spplotValueThe plotted object, of class trellis; see spplot in package sp.Author(s)Edzer J. Pebesma