Rodrigo Aluizio
2010-Jun-09 19:50 UTC
[R] [R-sig-Geo] How to extract coordinates values from a shapefile?
I'm not sure if this is what you want. But the function coordinates() in sp package gives you the coordinates of SpatialObjects. Regards. Rodrigo. 2010/6/9 Nikhil Kaza <nikhil.list@gmail.com>> You need to execute gpclibPermit() to enable gpclib. > > library(maptools) should have issued a warning to that effect. > > > Nikhil Kaza > Asst. Professor, > City and Regional Planning > University of North Carolina > > nikhil.list@gmail.com > > On Jun 9, 2010, at 3:34 PM, Thiago Veloso wrote: > > > Dear Nikhil, > > > > Thank you for your input. I tried your suggestion and received the > > following error: > > > > > fortify(br) > > Using UF_05 to define regions. > > Error: isTRUE(gpclibPermitStatus()) is not TRUE > > > > > > > Do you know what else could be done? > > > > Best wishes, > > > > Thiago. > > > > --- On Wed, 9/6/10, Nikhil Kaza <nikhil.list@gmail.com> wrote: > > > > From: Nikhil Kaza <nikhil.list@gmail.com> > > Subject: Re: [R-sig-Geo] How to extract coordinates values from a > > shapefile? > > To: "Thiago Veloso" <thi_veloso@yahoo.com.br> > > Cc: r-sig-geo@stat.math.ethz.ch > > Date: Wednesday, 9 June, 2010, 16:00 > > > > Look at this. Not sure if this is indeed what you want or if you > > actually have to unproject them. > > > > http://www.mail-archive.com/r-sig-geo@stat.math.ethz.ch/msg04715.html > > > > require(ggplot2) > > fortify(br) > > > > > > Nikhil Kaza > > Asst. Professor, > > City and Regional Planning > > University of North Carolina > > > > nikhil.list@gmail.com > > > > On Jun 9, 2010, at 2:45 PM, Thiago Veloso wrote: > > > > > Dear R colleagues, > > > Does anyone know if it's possible to create a vector with > > coordinate values extracted from a shape loaded with readShapePoly > > command of "maptools" package? > > > For example, the following code loads the shapefile containing > > Brazilian states division: > > > library(maptools)br<-readShapePoly("BR-map/3.shp") > > > What I need to do is create a vector which contains all lat and > > lon values inside this shapefile... > > > Thanks in advance, > > > Thiago Veloso. > > > > > > > > > > > > [[alternative HTML version deleted]] > > > > > > _______________________________________________ > > > R-sig-Geo mailing list > > > R-sig-Geo@stat.math.ethz.ch > > > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > > > > > > > [[alternative HTML version deleted]] > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-geo >[[alternative HTML version deleted]]
Nikhil Kaza
2010-Jun-09 20:20 UTC
[R] [R-sig-Geo] How to extract coordinates values from a shapefile?
What does coordinates() give for a polygon? centeroid? I suppose I could look up the code, but it would be immensely helpful if the help page could specify it. regards Nikhil On Jun 9, 2010, at 3:50 PM, Rodrigo Aluizio wrote:> I'm not sure if this is what you want. But the function > coordinates() in sp package gives you the coordinates of > SpatialObjects. > > Regards. > > Rodrigo. > > 2010/6/9 Nikhil Kaza <nikhil.list@gmail.com> > You need to execute gpclibPermit() to enable gpclib. > > library(maptools) should have issued a warning to that effect. > > > Nikhil Kaza > Asst. Professor, > City and Regional Planning > University of North Carolina > > nikhil.list@gmail.com > > On Jun 9, 2010, at 3:34 PM, Thiago Veloso wrote: > > > Dear Nikhil, > > > > Thank you for your input. I tried your suggestion and received the > > following error: > > > > > fortify(br) > > Using UF_05 to define regions. > > Error: isTRUE(gpclibPermitStatus()) is not TRUE > > > > > > > Do you know what else could be done? > > > > Best wishes, > > > > Thiago. > > > > --- On Wed, 9/6/10, Nikhil Kaza <nikhil.list@gmail.com> wrote: > > > > From: Nikhil Kaza <nikhil.list@gmail.com> > > Subject: Re: [R-sig-Geo] How to extract coordinates values from a > > shapefile? > > To: "Thiago Veloso" <thi_veloso@yahoo.com.br> > > Cc: r-sig-geo@stat.math.ethz.ch > > Date: Wednesday, 9 June, 2010, 16:00 > > > > Look at this. Not sure if this is indeed what you want or if you > > actually have to unproject them. > > > > http://www.mail-archive.com/r-sig-geo@stat.math.ethz.ch/ > msg04715.html > > > > require(ggplot2) > > fortify(br) > > > > > > Nikhil Kaza > > Asst. Professor, > > City and Regional Planning > > University of North Carolina > > > > nikhil.list@gmail.com > > > > On Jun 9, 2010, at 2:45 PM, Thiago Veloso wrote: > > > > > Dear R colleagues, > > > Does anyone know if it's possible to create a vector with > > coordinate values extracted from a shape loaded with readShapePoly > > command of "maptools" package? > > > For example, the following code loads the shapefile containing > > Brazilian states division: > > > library(maptools)br<-readShapePoly("BR-map/3.shp") > > > What I need to do is create a vector which contains all lat and > > lon values inside this shapefile... > > > Thanks in advance, > > > Thiago Veloso. > > > > > > > > > > > > [[alternative HTML version deleted]] > > > > > > _______________________________________________ > > > R-sig-Geo mailing list > > > R-sig-Geo@stat.math.ethz.ch > > > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > > > > > > > [[alternative HTML version deleted]] > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-geo >[[alternative HTML version deleted]]