[postgis-users] Confusing Distance
    sub3 
    steve at subwest.com
       
    Wed Dec 17 12:34:43 PST 2008
    
    
  
Hi,
I was trying to calculate the distance (in NM) from two points.  I've found
a method using distance_spheroid, but I am curious why my original method
didn't work correctly:
select distance (
  transform( GeomFromText('Point(-76.29145663 -45.9229366415 )', 4269),
32661),
  transform( GeomFromText('Point(-76.42922377 -45.2098919078 )', 4269),
32661)
) / 1852
gives me 297 NM, but it is really a lot closer.  I thought distance() would
return the number of meters, then I divide by the number of meters in a NM.  
Thanks for any help.
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