[R] Overlaying maps

I'm having difficulty overlaying maps when writing to a file graphics device. My command sequence has the structure plot(map1) par(new = T) plot(map2) On the screen device, it works fine. When I attempt something like png(file = map.png) plot(map1) par(new = T) plot(map2) dev.off() only the

Re: [R] Overlaying maps

Using my mind-reading skills, plot.Map(), while deprecated, does provide an add= option. If this doesn't help, you'll need to read the posting guide and provide (a lot) more information. Ray Brownrigg On Thu, 19 May 2011, michael.laviole...@dhhs.state.nh.us wrote: I'm having difficulty