Try the R-Sig-Geo mailing list for a better target community, but if these are shapefiles there is read support in rgdal (or maptools for a simpler alternative) and if these are in long-lat like the maps package then plot(x, add=TRUE) will be most of the way there.
If you need to transform either layer then see spTransform or project in rgdal. Cheers, Mike On Sunday, April 1, 2012, chuck.01 wrote: > Hi, > I want to use map("state") and have the ecoregion shape (please see link) > file projected onto this. > > ftp://ftp.epa.gov/wed/ecoregions/cec_na/NA_CEC_Eco_Level3.zip > ftp://ftp.epa.gov/wed/ecoregions/cec_na/NA_CEC_Eco_Level3.zip > > Could someone please show me how; I have never messed with this sort of > thing. > Thanks. > > -- > View this message in context: > http://r.789695.n4.nabble.com/map-and-shapefile-help-tp4522794p4522794.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org <javascript:;> mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Michael Sumner Institute for Marine and Antarctic Studies, University of Tasmania Hobart, Australia e-mail: mdsum...@gmail.com [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.