README.md

#Generate cities data

1. wget http://download.geonames.org/export/dump/cities15000.zip
2. unzip cities15000.zip
3. node geonames.js cities15000.txt

The result is json array of cities in the following format:

{
	_id: <ID>
	name: <Name>,
	alternate_names: [<alternatename1>,…],
	coordinates: [<Latitude>, <Longitude>]
}

#Import to MongoDB

mongoimport -d db_name -c cities cities.json --jsonArray

geonames.js

var fs = require('fs')
  , _ = require('underscore');

var filename = process.argv[2];
if (!filename) {
  console.log('File not found');
  process.exit(1);
}

var cities = fs.readFileSync(filename).toString().split("\n");
cities.pop(); // empty element
var processedCities = _.map(cities, function(city) {
  var data = city.split('\t');
  var names = data[3].split(',');
  return {
    _id: Number(data[0]),
    name: data[1],
    alternate_names: _.map(names, function(name) {
      return name.toLowerCase();
    }),
    coordinates: [Number(data[4]), Number(data[5])]
  }
});

fs.writeFileSync('cities.json', JSON.stringify(processedCities));