Comments on: Geo Proximity Search: The Haversine Equation http://blog.fedecarg.com/2009/02/08/geo-proximity-search-the-haversine-equation/ Simple is better than complex. Complex is better than complicated. | @fedecarg Mon, 06 Feb 2012 14:38:53 +0000 hourly 1 http://wordpress.com/ By: tanner http://blog.fedecarg.com/2009/02/08/geo-proximity-search-the-haversine-equation/#comment-7389 Wed, 19 Oct 2011 11:30:21 +0000 http://phpimpact.wordpress.com/?p=1217#comment-7389 EXCELLENT! This is why god invented the blog, so people can get this type of excellent information. Thank you so much for the knowledge.

]]> By: Tandeson http://blog.fedecarg.com/2009/02/08/geo-proximity-search-the-haversine-equation/#comment-7292 Sun, 28 Aug 2011 03:42:57 +0000 http://phpimpact.wordpress.com/?p=1217#comment-7292 Using the python version of this code for a small personal project (looking at drive times from Real estate while house hunting). Thank you very much for posting this.

]]> By: Federico http://blog.fedecarg.com/2009/02/08/geo-proximity-search-the-haversine-equation/#comment-7287 Thu, 18 Aug 2011 14:24:19 +0000 http://phpimpact.wordpress.com/?p=1217#comment-7287 Yes, you can:

http://blog.fedecarg.com/2009/02/08/geo-proximity-search-the-haversine-equation/#comment-4528

]]> By: David C http://blog.fedecarg.com/2009/02/08/geo-proximity-search-the-haversine-equation/#comment-7284 Tue, 16 Aug 2011 15:27:46 +0000 http://phpimpact.wordpress.com/?p=1217#comment-7284 This looks very interesting and possibly what I am after. Can I utilise this to initiate some form of proximity detection? I have a google map that users can add a marker to (They don’t see any other markers). I need to stop a new marker being placed within 3 miles of a lat/long that already exists in my ms-sql 2008 database. I am coding in php.

Any help gratefully appreciated, as this has been wearing me down and i’m coming close to needing a toupee to cover the clusters of hair I have ripped out!

]]> By: dhiru http://blog.fedecarg.com/2009/02/08/geo-proximity-search-the-haversine-equation/#comment-7216 Wed, 22 Jun 2011 08:36:39 +0000 http://phpimpact.wordpress.com/?p=1217#comment-7216 1. nothing its just a parameter for calculating distance
2. no it is not necessary to covert km in miles. use
$radius = $radius_in_km * 0.621371192;

]]> By: V83 http://blog.fedecarg.com/2009/02/08/geo-proximity-search-the-haversine-equation/#comment-7182 Mon, 02 May 2011 15:44:54 +0000 http://phpimpact.wordpress.com/?p=1217#comment-7182 Thanks for posting this!
There are just a couple things I don’t get, though, and forgive me if my questions will be stupid:
1) what does that “69″ stand for?
2) is it necessary to convert km in miles?

Thank you so much

]]> By: Andrea http://blog.fedecarg.com/2009/02/08/geo-proximity-search-the-haversine-equation/#comment-6859 Wed, 27 Oct 2010 21:40:03 +0000 http://phpimpact.wordpress.com/?p=1217#comment-6859 Mitico!!!
Mi hai risparmiato un bel po’ di lavoro :-)

]]> By: Dave Marshall http://blog.fedecarg.com/2009/02/08/geo-proximity-search-the-haversine-equation/#comment-6845 Fri, 08 Oct 2010 11:18:03 +0000 http://phpimpact.wordpress.com/?p=1217#comment-6845 Cheers buddy, I’m familiar with Lucene/Solr but haven’t seen Sphinx before, I’ll check it out.

]]> By: Federico http://blog.fedecarg.com/2009/02/08/geo-proximity-search-the-haversine-equation/#comment-6842 Thu, 07 Oct 2010 15:48:16 +0000 http://phpimpact.wordpress.com/?p=1217#comment-6842 Hi Dave :)

Check out the following PDF, specially the part where it says “How to speed up the query”:

http://www.arubin.org/files/geo_search.pdf

MySQL is slow, I recommend using http://sphinxsearch.com to perform geo distance search.

]]> By: Dave Marshall http://blog.fedecarg.com/2009/02/08/geo-proximity-search-the-haversine-equation/#comment-6841 Wed, 06 Oct 2010 19:21:29 +0000 http://phpimpact.wordpress.com/?p=1217#comment-6841 Now then Fede!

Always nice to see a blog I’m familiar with showing up in google searches.

Which implementation do you prefer, handing over to the SQL or giving the sql the lat/long constraints?

]]>