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Home » Eclipse Projects » Spatiotemporal Epidemiological Modeler (STEM) » Air transportation now operational
Air transportation now operational [message #560846] Thu, 23 April 2009 17:55
Stefan Edlund is currently offline Stefan EdlundFriend
Messages: 127
Registered: July 2009
Location: IBM
Senior Member
Hi all,

as of the latest build (0.5.0.I20090423 from, thanks Yossi), air
transportation is now working for the US model. More details on how air
transportation is modeled will be described in detail on the STEM wiki in
the near future. To summarize the method used here, a region that has one
ore more airports is connected using a Pipe Transportation Edge to a node
in the sky called an Air Transportation System. The pipe transportation
edge moves people up and down using actual data we collected from FAA data
sources on primary and non-primary US airports. For instance, California
counties having primary and non-primary airports are connected to a
California air transportation system. The population of this air
transportation system is the total number of passengers expected to travel
by air for a given time period (e.g. daily).

A state air transportation system is connected to a US air transportation
system using pipe transportation edges with a capacity representing the
total number of expected passengers expected to fly from the state to any
other US state (i.e. "inter-state" travelers versus "intra-state"
travelers). This number can be deduced from statistical analysis of US air
transportation data.

Within an air transportation system, the disease model is free to operate
using the same dynamics as for any other region node modeling the contacts
between people in airports and on airplanes.

To try it out, build a model for US level 2 (counties) and drag the "Air
transportation between USA Counties (2) and USA States (1)" into the
model. Also drag "Air transportation between USA States (1) and USA (0)"
into your model. You can view the air transportation edges from the Map
view under the Edges dropdown.

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