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I have a PlaceID | PlaceName | Lat | Lon as my database structure.
Say I have my current latitude and longitude as
$lat = "37.331862";
$lon = "-122.029937";
I want to find places that are in a 100 feet radius. Might allow the user to choose.
You may be interested in checking out the following presentation:
The author describes how you can use the Haversine Formula in MySQL to order by proximity and limit your searches to a defined range. He also describes how to avoid a full table scan for such queries, using traditional indexes on the latitude and longitude columns.
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