Hi Erin, I tried that but ended up getting this error. Does the spTransform function requires the data to be as data.frame? Here is what i did to read the data
library(maptools) library(rgdal) nc.river<-readShapeSpatial("~/hydromaj/hydromaj_arc.shp") #reading the shape file nc1.wgs84 <- spTransform(nc.river,CRS("+proj=longlat +datum=WGS84")) Error in spTransform(xSP, CRSobj, ...) : No transformation possible from NA reference system Thanks again Migee On Mon, Feb 25, 2013 at 5:47 PM, Hodgess, Erin <hodge...@uhd.edu> wrote: > Hi! > > Suppose your data set is called nc1.df. > > Then you can do: > library(rgdal) > nc1.wgs84 <- spTransform(nc1.df,CRS("+proj=longlat +datum=WGS84")) > > > ________________________________________ > From: r-sig-geo-boun...@r-project.org [r-sig-geo-boun...@r-project.org] on > behalf of Migun Shakya [microbea...@gmail.com] > Sent: Monday, February 25, 2013 4:21 PM > To: r-sig-geo@r-project.org > Subject: [R-sig-Geo] converting from NAD83 datum to lat,lon > > Hi all, > > Is there a way/package/trick to convert the NAD83 formatted file to > lat lon format? > > I downloaded the "Major Hydrography" dataset from NC,USA to plot > rivers into a NC map. However, the dataset is in NAD83 or in state > plane projection, but i need it to be in lat/lon. > > > Any help would be great. > > > Thanks > Migee > > > dataset can be found in: > http://data.nconemap.com/geoportal/catalog/search/resource/details.page?uuid=%7B2515713B-2CA0-476F-863F-61441A9D6F70%7D > > > The downloaded dataset consist of > hydromaj_arc.dbf > hydromaj_arc.prj > hydromaj_arc.shp > hydromaj_arc.shx > hydromaj_arc.txt > hydromaj_poly.dbf > hydromaj_poly.prj > hydromaj_poly.shp > hydromaj_poly.shx > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@r-project.org > https://stat.ethz.ch/mailman/listinfo/r-sig-geo _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo