#字段说明
city The name of the city/town as a Unicode string (e.g. Goiânia).
city_ascii city as an ASCII string (e.g. Goiania). Left blank if ASCII representation is not possible.
lat The latitude of the city/town.
lng The longitude of the city/town.
country The name of the city/town's country.
iso2 The alpha-2 iso code of the country.
iso3 The alpha-3 iso code of the country.
admin_name The name of the highest level administration region of the city town (e.g. a US state or Canadian province). Possibly blank.
capital Blank string if not a capital, otherwise: country's capital (e.g. Washington D.C.)
population An estimate of the city's urban population. Only available for some (prominent) cities.
id A 10-digit unique id generated by SimpleMaps. We make every effort to keep it consistent across releases and databases (e.g. U.S Cities Database).