Geolocation API

http://code.google.com/intl/zh-TW/apis/gears/geolocation_network_protocol.html
http://donpark.org/blog/2009/08/29/geomena-org-open-access-point-geodatabase

Get geo-location by wifi mac address.

Request:
$ curl --data '{"version":"1.1.0","wifi_towers":[{"mac_address":"00-1c-df-66-ca-f6","ssid":"","signal_strength":-31}]}' https://www.google.com/loc/json

Response
{"latitude":45.5165989,"longitude":-122.6307207,"accuracy":150.0}, "access_token":"2:3PfDbpb1YDCFoGhs:zSUG3BG4LJvUgaHA"}