The process followed was the following:
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Download data containing the addresses of 1404 mini markets in athens.
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Use google API to query the latitude and longitude of the addresses, given the information of the location (area and address).
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Convert latitude and longitude to cartesian coordinates, assuming linearity with small error due to the restricted range.
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Use google maps api to keep a white simplified map of Athens.
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Create the voronoi diagram using the coordinates of the points.
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Superimpose the results of 4,5 on a single image.
Result
