I am plotting some data using sp package library (sp) library(maps) data.aggm # data # Define standard projection ll <- CRS("+proj=longlat +datum=WGS84") # convert to a SpatialPointsDataFrame xy <- cbind(data.aggm[,1], data.aggm[,2]) ch4.spPoints <- SpatialPointsDataFrame(coords=xy, data=data.frame(data.aggm[,3]), proj4string=ll) after running this I am getting error is Error in validityMethod ( as (object,superClass)): Geographical CRS given to non -comformant data does any body know how to fix this error ? Cheers -- View this message in context: http://r.789695.n4.nabble.com/projection-problem-in-sp-package-tp4439317p4439317.html Sent from the R help mailing list archive at Nabble.com.