Subsequent to Roger's suggestion I will shortly be sending a link to a site where the shapefile in question and it's various extensions can be downloaded as a zip file. Any and all assistance with this problem are greatly appreciated.
Tyler On Sat, Mar 28, 2009 at 8:04 AM, Roger Bivand <roger.biv...@nhh.no> wrote: > On Fri, 27 Mar 2009, Tyler Dean Rudolph wrote: > > I have no trouble importing a subset of a road network for my study area as >> a shapefile into R, but when I try to import the complete network (area >> equivalent to approximately 30,000 km^2), I get the following error >> message >> (even when I split up the two class formats into two separate commands): >> >> fullroads<-as(as(readShapeLines(fn="D:\\GIS\\roadnet.shp"), >>> >> "SpatialLines"), "psp") >> *Error in function (classes, fdef, mtable) : >> unable to find an inherited method for function "coordinates", for >> signature "numeric"* >> ** >> Is this due to the memory limitations of R, or to those of my particular >> machine, or to something else I'm missing? >> > > It may be the file, it isn't memory (the error message would say so), and > it is unlikely to be your machine. Please provide sessionInfo() and > traceback() from immediately after the error. If the files in question can > be made available as a zip archive on a website, this may allow others to > try to debug the problem. We saw something like this with odd polygon > geometries recently, but not with lines. > > Roger > > The processes I am trying to >> model are happening at very "large" spatial scales and it would be a great >> deal more efficient if I could use the entire road network rather than >> dealing with multiple subsets of a greater image. Importing as an ascii >> grid is not an option due to subsequent operations using distmap() which >> are >> based on the psp format. >> >> Tyler >> >> [[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 >> >> > -- > Roger Bivand > Economic Geography Section, Department of Economics, Norwegian School of > Economics and Business Administration, Helleveien 30, N-5045 Bergen, > Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43 > e-mail: roger.biv...@nhh.no > > [[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
