The FloVis project is supported by the Department of Homeland Security under Contract No. N66001-08-C-2032. We also wish to acknowledge the support of Ron McLeod of TARA, CA Labs, the Canadian Foundation on Innovation and NSERC in this research initiative. Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the Department of Homeland Security.