On Thu, 13 Sep 2007, Takatsugu Kobayashi wrote: > Hi, > > I would like to know if there are packages to compute shortest network > path distances, something that can be down on TransCAD and ArcGIS > network analyst. I have cencus tract centroids and network line > shapefiles for 126 US urbanized areas. Basically, I would like to move > the census tract centroids a bit to see how much it changes the shortest > path distances.
There are a couple of pointers in this earlier thread: http://finzi.psych.upenn.edu/R/Rhelp02a/archive/96654.html to the e1071 package, and it seems as though isomap in the vegan package is another possibility. How well they scale is a different question, though. I would also think that there might be something on Bioconductor. Roger PS. Remember RSiteSearch() - it usually comes up with something! > > If not possible, I guess I should program on ArcGIS using Python. > > Thank you very much > > Taka > > _______________________________________________ > 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: [EMAIL PROTECTED] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
