I am currently doing the following to draw circles at the indicated distances from the center. The center is given by utm coordinates: utm.e, utm.n . It does work:
class(im2) # "SpatialGridDataFrame" image(im2, "ind", col = col$ct) library(plotrix) dd <- c(25, 50, 100, 150) for(i in 1:4) draw.circle(utm.e, utm.n, dd[i], border = "yellow") However, I would like to do this in a style better suited to sp and rgdal by defining a function whose contours are circles and plotting the indicated contours of it. Also I assume I will get labelled contours by doing that which I don't currently have. How do I do that? I would appreciate specific code, if possible, Thanks. _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo