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Posted by NC on 05/05/06 00:22
robert wrote:
> | $distance = $r * acos(cos($lat1) * cos($lon1) * cos($lat2) * cos($lon2) +
> | cos($lat1) * sin($lon1) * cos($lat2) * sin($lon2) +
> | sin($lat1) * sin($lat2));
> |
> | where:
> |
> | $r -- radius of the Earth
> | $lat1 -- latitude of point 1 in radians
> | $lon1 -- longitude of point 1 in radians
> | $lat2 -- latitude of point 2 in radians
> | $lon2 -- longitude of point 2 in radians
>
> outta curiosity, what unit of measure is this distance in?
Same as the radius of the Earth.
Cheers,
NC
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