On Youtube, I saw a Hak5 interview with a person who uses balloons to map events using a high altitude balloon - interview starts around 2 minutes. http://www.youtube.com/watch?v=_jyOu5TetKw&feature=g-u-u He mentions how to use balloons to map, and what the restrictions are.
Referenced links in the article http://publiclaboratory.org/map/toorcamp-2012-makah-passage-neah-bay-washington/2012-08-09
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