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RE: st: spatial analysis - DISTANCE


From   Roy Wada <roywada@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: spatial analysis - DISTANCE
Date   Sun, 30 Aug 2009 11:04:46 -0700

Looks like it's getting cutoff again. There seems to be a 
limit on emails received by the Statalist server from Hotmail 
accounts. Just get it from ssc when it's up there.
 
Roy
 
 
... continued:

* Great Circle Distance Formulas
  foreach var in `dist' {
   replace ``dist'New'=3963 * acos(sin(``latitude'New'/57.2958) * sin(`latitude'/57.2958) + cos(``latitude'New'/57.2958) * cos(`latitude'/57.2958) * cos(``longitude'New'/57.2958-`longitude'/57.2958))
   replace ``dist'New'=. if ``dist'New'>`less'
   replace ``dist'New'=. if ``dist'New'
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