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Back to article list Search Articles Add Comment Printer friendly Direct link Clarion in general: Calculate distance based on global position 2006-06-09 -- Len Lutz > Where did you find the formula to calculate distance? I have looked at
> the
> database from zipcodeworld, the data is there but we would need to be able
> to do that distance calculation.
For calculating distance, try this code. I have found it gives me pretty
accurate "DRIVING" distances (in miles) between two zipcodes
(Latitudes/Longitudes of zipcodes). If you want the actual, straight-line
distance between the centers of the zipcode areas, remove the " * 1.28" at
the end of the last line.
===================================
GetDist PROCEDURE (SREAL Lat1, SREAL Lon1, SREAL Lat2, SREAL
Lon2, *SREAL Distance)
rLat1 SREAL
rLon1 SREAL
rLat2 SREAL
rLon2 SREAL
Deg2Rad EQUATE(0.0174532925199e+000)
CODE
rLat1 = Deg2Rad * Lat1
rLon1 = Deg2Rad * Lon1
rLat2 = Deg2Rad * Lat2
rLon2 = Deg2Rad * Lon2
Distance = (3963.1 * (ACOS(SIN(rLat1) * SIN(rLat2) + COS(rLat1) *
COS(rLat2) * COS(rLon2 - rLon1))) * 1.28)
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