问题
I need to convert from iso-3166-1/iso-3166-2 codes to longitude/latitude
Examples:
- Input: "US", Output: (37.09024, -95.71289100000001).
- Input "VE-O", Output: (10.9970723, -63.91132959999999).
I have been searching around but failed to find a complete listing or, ideally, a Java library doing it.
This Github project is promising but is missing a lot of geolocation information for a lot of regions.
Note that, unlike the question Need a list of all countries in the world, with a longitude and latitude coordinate, this one refers to regional subdivisions (iso-3166-2).
回答1:
Since I didn't get any answers, I will explain how I solved it.
I found this csv listing for the iso-3166-1 country code centroids: http://dev.maxmind.com/geoip/legacy/codes/country_latlon/ (I had to make a few manual tweaks)
As for the iso-3166-2 region centroids, I ended up creating a shell script which uses the Google Maps API to print the region centroids in csv format (note that I didn't verify the full output but the cases I checked are correct). Here's a simplified version of the script using curl and jq to process the API's output:
#!/bin/bash
# Example list of regions (full list can be obtained from https://www.ip2location.com/free/iso3166-2 )
REGIONS="VE-O GB-BKM GB-CAM GB-CMA"
for REGION in $REGIONS; do
LATLON=$(curl -s "maps.googleapis.com/maps/api/geocode/json?sensor=false&address=$REGION" | jq -r '.results[0].geometry.location.lat,@text ",",.results[0].geometry.location.lng')
echo $REGION , $LATLON | tr -d ' '
done
Then I imported the csv listings in my java code using Apache Commons CSV
回答2:
These are the best resources I found when I had to tackle this problem:
Country coordinates: http://dev.maxmind.com/geoip/legacy/codes/country_latlon/
ISO 3166-2 coordinates: https://github.com/oodavid/iso-3166-2/blob/master/iso_3166_2.js
来源：https://stackoverflow.com/questions/28794252/country-region-codes-iso-3166-1-iso-3166-2-to-longitude-and-latitude