Oscar Picasso wrote:

I guess I also need a database of the cities coordinates. Where could I find one?

You can download US data here:

  http://geonames.usgs.gov/domestic/download_data.htm

These are tables of geo entities with a number of columns, including lat/long. NGA (formerly NIMA) has similar data for non-US entities:

  http://earth-info.nga.mil/gns/html/cntry_files.html

Note that these data sets include =lots= of entities, not just cities - we've combined them into a DB with about 6 million items, and only about 2.5 million are population centers (by our scheme). Each of the data sets has feature type columns that you can filter on, though.

- John Burger
  MITRE


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