Thank you for the interest in NodeXL!
Twitter does provide location data on the tweets that users have allowed to display lat/long information.
You can find these columns in the "Edges" worksheet of NodeXL after a Twitter import has been performed.
However, in practice, we find that less than 3% of all tweets have their locations visible in the data that comes out of the public Twitter API. Most of the time, NodeXL has no information to populate the Lat and Long columns.
However, many users provide a text description of their location. While this information contains many possible sources of error, it may be useful to plot to get a basic sense of where users say the are located. This can be done relatively easily using the
Microsoft PowerMap feature found in many newer installations of Excel.
We used Microsoft PowerMap along with NodeXL to plat the locations of users of a hashtag ("#scicomm") as seen in the video linked to this tweet: