[R] GIS Help: distance calculation based on ZIP Code
lihawaii at gmail.com
Wed Dec 8 19:18:32 CET 2010
Thank you very much, I will look into it.
On 12/8/10, Mike Marchywka <marchywka at hotmail.com> wrote:
>> From: ggrothendieck at gmail.com
>> Date: Wed, 8 Dec 2010 10:50:40 -0500
>> To: lihawaii at gmail.com
>> CC: r-help at 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
> the landmarks DB probably does have hospitals listed. Also, distances are
> 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,
> ( 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
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