Rutgers University researchers have developed an algorithm to help find
open parking spaces, using ultrasonic sensors, global positioning system
(GPS) receivers, and cellular data networks. The goal is to create
Web-based maps or additions to navigation systems that make parking
availability data accessible to those looking for a parking space. The
researchers, led by Rutgers professors Marco Gruteser and Wade Trappe,
say that data could help alleviate traffic congestion and cut down on
energy use. To implement their system, the researchers mounted
ultrasonic distance sensors on the passenger-side doors of three cars,
which over two months collected parking data in a limited urban area.
They then created an algorithm that converted the ultrasonic data into
information on available parking spaces. Combining that data with GPS
data, the algorithm generated maps that were more than 90 percent
accurate. To distinguish parked cars from other objects, such as trees
or recycle bins, they measure the length and width of each object using
the ultrasonic sensor readings. Gruteser says the parking availability
information could be distributed over the Internet and used by drivers
to decide whether to park on the street or use a garage.
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