Comments on: How to create a ZIP code distance lookup table with 1 line of SQL http://markmaunder.com/2007/how-to-create-a-zip-code-distance-lookup-table/ Mon, 08 Mar 2010 05:58:41 -0800 http://wordpress.org/?v=2.8.4 hourly 1 By: Open Source Seattle | Blog Archive | Free data for the taking http://markmaunder.com/2007/how-to-create-a-zip-code-distance-lookup-table/comment-page-1/#comment-75 Open Source Seattle | Blog Archive | Free data for the taking Tue, 14 Aug 2007 21:08:41 +0000 http://markmaunder.com/2007/how-to-create-a-zip-code-distance-lookup-table/#comment-75 [...] The free zip code database from CivicSpace (combine with Mark Maunder’s zip code distance lookup in SQL) [...] [...] The free zip code database from CivicSpace (combine with Mark Maunder’s zip code distance lookup in SQL) [...]

]]> By: mark http://markmaunder.com/2007/how-to-create-a-zip-code-distance-lookup-table/comment-page-1/#comment-22 mark Sat, 21 Jul 2007 05:10:38 +0000 http://markmaunder.com/2007/how-to-create-a-zip-code-distance-lookup-table/#comment-22 <p>It's not. I've tried it. MySQL's implementation of the trig functions is very fast and it's very good at fast disk access/caching. There may be a faster algorithm or some additional optimizations. One that occurs to me is using a bounding square before the haversine calculation which would take advantage of mysql's indexing.</p> It’s not. I’ve tried it. MySQL’s implementation of the trig functions is very fast and it’s very good at fast disk access/caching. There may be a faster algorithm or some additional optimizations. One that occurs to me is using a bounding square before the haversine calculation which would take advantage of mysql’s indexing.

]]> By: Brian H. http://markmaunder.com/2007/how-to-create-a-zip-code-distance-lookup-table/comment-page-1/#comment-21 Brian H. Sat, 21 Jul 2007 05:00:29 +0000 http://markmaunder.com/2007/how-to-create-a-zip-code-distance-lookup-table/#comment-21 This might be useful in terms of collecting the data: http://www.census.gov/geo/www/gazetteer/places2k.html Aside from that, SQL seems a bit inefficient for this job. I would probably do it in python or perl, then import. I'm guessing that would be a lot faster. This might be useful in terms of collecting the data: http://www.census.gov/geo/www/gazetteer/places2k.html

Aside from that, SQL seems a bit inefficient for this job. I would probably do it in python or perl, then import. I’m guessing that would be a lot faster.

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