Hi all, Thanks for all your help, Roger you were right! The merge function looked like it had done it fine but when I came to plot it the shapefile clearly hadn't joined correctly. I think this is some kind of bodge, but I've managed to use the match() function to join the csv with the shapefile, then use an if function along with gunioncascade to join the internal polygons according to col_2.
Match code: frame@data=gc[match(shape@data[,"Col_1"], csv[,"Col_1"]),] Then for each higher level (Col_2): TERRITORY1 <- gUnionCascaded(frame[ which(frame$TERR=='1'), ]) plot(TERRITORY1) TERRITORY2 <- gUnionCascaded(frame[ which(frame$TERR=='2'), ]) plot(TERRITORY2) I'm hoping I can now use a concatenation of "TERRITORY1", "TERRITORY2" etc. to map all of it, or single ones if I want. Just hoping the rest of my data from the csv is all joined on correctly. Working on ggplot2 map now. Thanks for everyone's help, just thought I'd update this! -- View this message in context: http://r-sig-geo.2731867.n2.nabble.com/Merging-shapefiles-and-csv-tp7586839p7586852.html Sent from the R-sig-geo mailing list archive at Nabble.com. _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo
