PS:max for the coordinates in both cases is 20000000

Just to confirm: you have two datasets of 20e6 items each. Where each item is a pair of coordinates; where each coordinate pair can range from '1,2 >tag' through '19999999,20000000 >tag' ?

In reply to Re: mapping coordinates- suggestion needed by BrowserUk
in thread mapping coordinates- suggestion needed by baxy77bax

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