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The centroids can be found [http://worldmap.harvard.edu/data/geonode:country_centroids_az8 here]. In order to be able to calculate distances by road through OpenStreetMap, we need identify the closest town to this centroid.
 
The centroids can be found [http://worldmap.harvard.edu/data/geonode:country_centroids_az8 here]. In order to be able to calculate distances by road through OpenStreetMap, we need identify the closest town to this centroid.
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In stead of the centroids we need a center based on the population distribution, so that we can take more into account where the goods will flow.
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Instead of the centroids we need a center based on the population distribution, so that we can take more into account where the goods will flow ([https://en.wikipedia.org/wiki/Center_of_population link]).
    
This approach does not work well for all countries:
 
This approach does not work well for all countries:
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