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I use the Google fusion table to table to mark city on google map, but there are about 20~25% which quality is ambiguous. How to make the ambiguous data precise?
Here is my finished map (scroll down to see map)

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It depends on the quality of your data. You can geocode each city with the Google geocoder and see the comparison with your geodata.

https://maps.googleapis.com/maps/api/geocode/json?address=1600+Amphitheatre+Parkway,+Mountain+View,+CA&sensor=true_or_false&key=API_KEY

Or your can try to geocode with others providers as OSM.

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