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I have a data-set comprising of 3 million records having latitude and longitude information associated with it, I want to condense it to form few thousands Geo-Circles, with radius and weight depending upon the records comprising in it.

Any suggestion regarding this kind of approximation algorithm or tool helping to build this ?

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Do you mean you wish to cluster points by spatial proximity? –  whuber Aug 19 '13 at 19:45
    
Yes, exactly I need to cluster these points by their spatial proximity, any existing solutions on this ? –  Gaurav Aug 19 '13 at 19:47
    
The link (in my previous comment) leads you to several dozen solutions :-). –  whuber Aug 19 '13 at 19:49
    
Thanks! I am going through each link, but wondering how I could scale these algorithms up-to 3 million records, as resulting circles will be each of dynamic radii. –  Gaurav Aug 19 '13 at 19:58
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