[R-sig-Geo] flow visualization in lat/lon space

[Markus Neteler]

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 <HardistF at gwm.sc.edu> wrote:
> >   
> >> ---------- Forwarded message ----------
> >> From: Markus Loecher <loecher at eden.rutgers.edu>
> >> To: r-sig-geo at 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 at 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:	thomas.adams at noaa.gov
> 
>  VOICE:	937-383-0528
>  FAX:	937-383-0033
> 

------------------
ITC -> dall'1 marzo 2007 Fondazione Bruno Kessler
ITC -> since 1 March 2007 Fondazione Bruno Kessler