[R-sig-Geo] Shortest network path distances

[Roger Bivand]

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
>
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-- 
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.Bivand at nhh.no