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Re:MongoDB Interactive Geospatial Tutorial by Joakal on Tuesday April 05, 2011 @07:40AM (#2410511)
http://www.mongodb.org/display/DOCS/Geospatial+Indexing

I've been doing Geospatial queries lately. It's pretty fast when going through 280k+ city coordinates at ~1-20 ms (Can't go lower than ms though) to find cities near [0, 0], [100.752, 120.236], etc.

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