Hi, I got cc'ed on this and can suggest to use GRASS 6 for this: It's a GIS and supports vector network analysis, linear reference system and more. I have put online a slide of our MITRIS traffic project, done in GRASS:
http://mpa.itc.it/markus/grass63/traffic/trafficmap_grass6.png (note that forward and backward travel direction are treated separately!) Vector maps you can export as SHAPE or KML. Regards, Markus PS: For flows on raster maps, see for an example http://grass.itc.it/grass63/screenshots/raster.php On Fri, Jun 01, 2007 at 03:30:58PM -0400, Thomas Adams wrote: > Markus, > > It's *possible* something like the Grid Analysis and Display System (GrADS) > (http://www.iges.org/grads/) could do the trick if you tweaked the data > right ? but that may be too much of a chore. Look at the image here > http://www.iges.org/grads/gadoc/tutorial.html down the page a bit. > > Regards, > Tom > > > Dear Markus and List, > > > > The most interesting project I have seen along these lines is Doantam > > Phan's flow map layout. It's in Java, however.... > > > > Link: > > http://graphics.stanford.edu/~dphan/code/flowmap/ > > > > regards, > > -Frank > > > > On 6/1/07, Frank Hardisty <[EMAIL PROTECTED]> wrote: > > > >> ---------- Forwarded message ---------- > >> From: Markus Loecher <[EMAIL PROTECTED]> > >> To: r-sig-geo@stat.math.ethz.ch > >> Date: Fri, 1 Jun 2007 14:56:27 -0400 (EDT) > >> Subject: [R-sig-Geo] flow visualization in lat/lon space > >> Dear list users, > >> has anyone experience in visualizing "flow" (e.g. with arrows or curvy > >> lines) on maps ? For example, I would like to draw/visualize the major > >> traffic flow patterns between counties in California. > >> There is a lot of flow visualziation software out there but none of them > >> seem to create the "pictures" on true geographic maps. > >> (It would be really, really cool to modify kmloverlay to do this) > >> > >> Thanks a lot, > >> > >> Markus > >> > >> _______________________________________________ > >> R-sig-Geo mailing list > >> R-sig-Geo@stat.math.ethz.ch > >> https://stat.ethz.ch/mailman/listinfo/r-sig-geo > > -- > Thomas E Adams > National Weather Service > Ohio River Forecast Center > 1901 South State Route 134 > Wilmington, OH 45177 > > EMAIL: [EMAIL PROTECTED] > > VOICE: 937-383-0528 > FAX: 937-383-0033 > ------------------ ITC -> dall'1 marzo 2007 Fondazione Bruno Kessler ITC -> since 1 March 2007 Fondazione Bruno Kessler _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
