Geospacial js/erlang library options?

聂维中 supernev at
Mon Mar 28 04:04:50 EDT 2011

I'm doing a location-based app and need to implement geo functions like "all
users around me in 100 ft".
I noticed mongodb and couchdb have this kinda library, but I'm not gonna use
those ones.

Is there suggestion of such libraries suitable for map/reduce?

Thanks.       Orz
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