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Posted by Steve on 11/29/06 04:57
"Pupkin" <spamagnet@dorrk.com> wrote in message
news:MPG.1fd6204510852de598978a@news.giganews.com...
| Hey,
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| Anyone know of a good PHP-based store/dealer locator app that can handle
| international locations?
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| We have a hand-built app from a previous programmer, but the thing is
| always breaking (Javascript errors, stores not showing up inside their
| own zip code).
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| We'd like the user to be able to type in an address or zip code and be
| shown a list of dealers within a certain radius. Integration with Google
| maps would be ideal.
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| I've found a few on Hotscripts, but most are US-centric. If anyone knows
| of a tried and trusted app, links are welcome!
|
| Thanks.
btw, i had saved this calculation some time ago. NC posted it here. this
formula will take long/lat and give you distance between two points. (acos,
cos, and sin are supported functions in most db's...i'd do it in a query
where it uses your lat/long points as input and and the criteria is where
distance is <= your max desired distance from any given store.
hth...and thanks to NC for the math. ;^)
$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
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