Hello, I am having a spatial object by reading a shp-file by the readShapePoly command. I now want to add data into the SpatialPolygonsDataFrame from an external source (its a dataframe which has a common key SHN_N). I am using the merge command, which I thought works fine, unitl I realized that "map.kreise" now became just a data.frame. My greatest fear in working with spatial objects is that, if I don't have them in one object, I end up plotting a value for the wrong region. So is there a way to use merge or what is the most appropriate way to combine data?
map.kreise<-readShapePoly("vg250krs",IDvar="KRS_ID",verbos=TRUE) # reads the shape file map.kreise<-merge(map.kreise,INC,sort = FALSE,by.map.kreise="SHN_N", by.INC="SHN_N",all.map.kreise=T,all.INC=T) Thanks a lot in advance, Stefan _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo