Thank you very much, I will look into it. Best,
xing On 12/8/10, Mike Marchywka <marchy...@hotmail.com> wrote: > > > > > > > > > > > > > ---------------------------------------- >> From: ggrothendi...@gmail.com >> Date: Wed, 8 Dec 2010 10:50:40 -0500 >> To: lihaw...@gmail.com >> CC: r-help@r-project.org >> Subject: Re: [R] GIS Help: distance calculation based on ZIP Code >> >> On Wed, Dec 8, 2010 at 10:41 AM, XINLI LI wrote: >> > Dear R Group Users: >> > >> > If there is a resource or easy way to calculate the distance >> > between zipcodes, for example, if I have the zipcode for 200 patients, >> > and the zipcode of a hospital, how to calculate the travel distance of >> > these individual patient to the hospital based on the zipcode. Your >> > input will be greatly appreciated. >> > >> >> Try the R-Sig-Geo list. > > Data sources do come up here a bit so I will comment that you can > get line-oriented lists of post office locations and more from the > census. The TIGER files would let you find streets etc but are probably > too big for hosting yourself. IIRC, I had to cobble together the zipcode > locations but the data is available. Probably you need more resolution and > other things like traffic data to make a routing decision but I would > mention > the landmarks DB probably does have hospitals listed. Also, distances are > short > enough that "as the crow flies" you could probably linearize and use scaled > x*x+y*y instead of the spherical stuff. > > I may have put it up here along with other illustrations of things > you can do with public data, > > http://www.spottext.com/marchywka/distroform.cfm > > ( I would caution this site is not exactly professional but it > may be informative, I am using it for idea testing etc ) > >> >> -- >> Statistics & Software Consulting >> GKX Group, GKX Associates Inc. >> tel: 1-877-GKX-GROUP >> email: ggrothendieck at gmail.com >> >> ______________________________________________ >> 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. > ______________________________________________ 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.
