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91 bytes added ,  08:52, 9 February 2021
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For small countries, it is clear that the major city should be used as Centroid. Think of Andorra, Liechtenstein, Monaco and San Marino.
 
For small countries, it is clear that the major city should be used as Centroid. Think of Andorra, Liechtenstein, Monaco and San Marino.
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== Observations ==
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== Country Remarks ==
 
The city population centroids have been found a step by step process. This allows to see how the centroid changes after a city has been added. In general the largest city dominates the position of the centroid. And if that city is also close to the geographic centroid, it will be the centroid in the end (Belgium, Spain). If a large city is surrounded by other cities, then one of those can become the centroid (Norway, Switzerland). The layout of motorways can influence the selection between two cities (France).
 
The city population centroids have been found a step by step process. This allows to see how the centroid changes after a city has been added. In general the largest city dominates the position of the centroid. And if that city is also close to the geographic centroid, it will be the centroid in the end (Belgium, Spain). If a large city is surrounded by other cities, then one of those can become the centroid (Norway, Switzerland). The layout of motorways can influence the selection between two cities (France).
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* ''Switzerland'' - Olten is one of the smaller towns in the valleys around Zurich, which dominates the centroid. Note that for transport a route through Italy is sometimes more advantageous.
 
* ''Switzerland'' - Olten is one of the smaller towns in the valleys around Zurich, which dominates the centroid. Note that for transport a route through Italy is sometimes more advantageous.
 
* ''United Kingdom'' - Although the UK is dominated by London, there are a lot of large cities to the north. This is the reason Leicester is the centroid.
 
* ''United Kingdom'' - Although the UK is dominated by London, there are a lot of large cities to the north. This is the reason Leicester is the centroid.
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== Observations ==
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Can this approach also be used to get an indication of country size?
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