graphical visualisation of twitter data

what method can I use to get locations from tweet messages on twitter开发者_如何学JAVA

All of the Twitter API calls that return Tweets return the Geo lat and long as part of the tweet's data. But only a tiny percentage of tweets contain this data, because people don't turn on the option to have their cell phone add this data. Most sets of tweets I have collected had a geo code rate of about 0.5% or less. Every tweet delivered by the API also the user's complete profile, which includes whatever they have typed into the location field. This is usually some ironic joke, such as "here".