From: Dan Diebolt <dandiebolt@...>
Date: 2005-12-14T03:29:01+09:00
Subject: Re: US Zipcode API for Ruby?

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>The only thing remaining is an efficient algorithm for a search for all zipcodes within a given radius.
   
  http://www.4guysfromrolla.com/webtech/040100-1.shtml
   
          
' THIS VARIABLE SETS THE RADIUS IN MILES  iRadius = 150    LatRange = iradius / ((6076 / 5280) * 60)  LongRange = iRadius / (((cos(cdbl(iStartLat * _              3.141592653589 / 180)) * 6076.) / 5280.) * 60)    LowLatitude = istartlat - LatRange  HighLatitude = istartlat + LatRange  LowLongitude = istartlong - LongRange  HighLongitude = istartlong + LongRange  


			
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