Date:         Fri, 10 Dec 1999 07:31:55 -0800
Reply-To:     dward <dwardNOdwSPAM@SASHELP.COM.INVALID>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         dward <dwardNOdwSPAM@SASHELP.COM.INVALID>
Organization: http://www.remarq.com: The World's Usenet/Discussions Start Here
Subject:      Re: Help: distance between zip codes

I had to solve a problem concerning this same issue a little while
back.  I had the zip codes for a population of about 700,000 doctors
and needed to define communities of doctors within x miles from various
hospitals.  Two things are needed:
1) The longitude and latitude of the zip codes.  We got this using
proprietary software built by our own company.  I don't know exactly
how you could get this, but you'll need the lat/long of the "zipcode
centroid"
2) Use the following code to compute the distance from two lat/long
pairs:
http://www.sashelp.com/CodeLibrary/getcode.asp?codeID=3
This shows how to use the haversine formula to get the distance in
miles from two points.

HTH,
David Ward


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