On Wed, Jun 3, 2009 at 1:17 PM, Rodrigo Aluizio <r.alui...@gmail.com> wrote: > Hi list. > > I would like to know if someone had already successfully loaded and Arc/Info > Ungenerated (.dat – extracted from > http://rimmer.ngdc.noaa.gov/mgg/coast/getcoast.html) file on R. I’m able to > do so with shape files using maptools functions, but these ungenerated data > are making me crazy. > > I don’t have any of ArcGIS tools (one of them probably can do that), and I > can’t find any free tool that converts these .dat (lat, long coordinates) to > .shp.
If you look at the ungenerate format files you'll see that they are plain text: 1 -17.999932,27.647185 -18.000812,27.646891 -18.002572,27.648651 -18.003452,27.648651 -18.004332,27.647771 etc etc until END 2 [more coord pairs] END etc etc until END END So you could read these in with 'scan' or 'read.table', and then manipulate them in order to feed to the sp routines for constructing Spatial Line or Polygon objects. See Bivand,Pebesma and Gomez-Rubio's Applied Spatial Data Analysis in R book for details. Once you've written a nice function to do that, tell us and maybe it'll go into a package somewhere. [ An easy trick would be to open the file in a text editor, and replace any line that didn't have a comma with NA,NA: then you could read the whole thing using read.csv, and then use plot(...,type='l') to display the features. The NA,NA coords act as a break to produce separate polygons or line segments ] You might also like to ask on the R-sig-geo group. Probably more appropriate mailing list than this one. Barry ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
