Satellites, balloons, and math…

CNET News

Satellites, balloons, and math used to count inauguration crowd by Elinor Mills

Published: January 20, 2009 6:23 PM PST

“The accuracy of counting crowds for events like the presidential inauguration is improving thanks to cameras on satellites and aerostat balloons, but projections still vary.” – Mills

http://news.cnet.com/8301-11386_3-10146632-76.html

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