I guess this is somehow related, world population by latitude and longitude, which you can use to of course derive center. http://blog.andersen.im/2013/05/inte

I guess this is somehow related, world population by latitude and longitude, which you can use to of course derive center. http://blog.andersen.im/2013/05/interactive-map-of-world-population-by-point-latitude-and-longitude/ http://blog.andersen.im/2013/05/interactive-map-of-world-pop...