generate & plot elevation contour lines
karl.sommer at dpi.vic.gov.au wrote:
my understanding is that adding the "contour = TRUE" will add the contour lines for kriged zinc concentration in the present example. However, what I am after is to superimpose contour lines of elevation in meters above sea level on top of an interpolated variable that is not elevation, eg zinc concentration or some other variable. I have an interpolated maps of an electromagnetic survey (EM38) of a field and I would like to overlay a plot of contour lines to visualize surface drainage patterns.
In that case you could pass them as a SpatialLinesDataFrame object in the sp.layout list. It will not automatically print the contour values, but you may be able to use colour; the corresponding legend will be the next issue, then. -- Edzer