Thank you very much.. It seems that the points problem is fairly easy to solve, I just need to work on the mapping..
Thanks again... Shawn Way, PE Engineering Manager [EMAIL PROTECTED] -----Original Message----- From: Barry Rowlingson [mailto:[EMAIL PROTECTED] Sent: Thursday, October 14, 2004 5:42 AM To: Shawn Way Cc: [EMAIL PROTECTED] Subject: Re: [R] Maps and plotting Shawn Way wrote: > At our facility we have multiple sample points that are sampled on > any given day. What I would like to do is create a map of the > facility with the sample points (and point labels) and when we have > out of specification results, place a transparent dot over the area on the map. > As the number of OOS results builds up, I envision the dot getting > darker. > Over what timescale? This sounds like it could be an interactive, real-time on-line monitoring thing. Is it? In which case R's graphics devices might not be good enough, and you'd be better off using a TclTk graphics canvas. library(tcltk) and read the docs! Another idea, if all you are doing is updating a daily image, would be to use a language like Python, and the Python Imaging Library (PIL) to draw pretty graphs. I've done something similar that produces daily maps of disease incidence, but I used different size and colour circles and not transparency, so I just used base R graphics and produced a PNG file. If I wanted transparency I'd probably use Python/PIL, which can handle alpha channels. Baz ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
