One nice way to display observations that are indexed spatially is
small blocks of differing color, where the two axes represent two-dimensional
space. This uses the image.plot() function from the fields
package.
tmp=as.image(y,x=locns) # y is a vector of observations,
and x a two-column matrix of locations
image.plot(tmp$x,tmp$y,tmp$z,col=tim.colors(32),xlab="",ylab="")
Keywords: image.plot, R, plot, observations, spatial
Last modified 11/19/05.