A Moving-Objects Datablade

Ouri WolfsonUniversity of Illinois, Chicago

wolfson@eecs.uic.edu

Sources of Location-information • GPS triangulation (satellites, indoors-sonar)

• Sensors – e.g. toll booth that detects card in windshield.

• Triangulation in cellular architecture

• Cell-id

• Bluetooth (proximity positioning)

• Car navigation system, calendar system

• Scene analysis (camera location + shape/size/direction of object ==> object location)

Location information varies in accuracy, reliability, precision, predictability.

Moving Objects Database Technology

Query/trigger examples:• During the past year, how many times was bus#5 late by more than 10 minutes

at station 20, or at some station (past query)• Send me message when helicopter in a given geographic area (trigger)

• Trucks that will reach destination within 20 minutes (future query)• Taxi cabs within 1 mile of here (present query)• Make my PalmPilot geographically “context aware”

GPS

GPS

GPS

Wireless link

Applications-- Summary• Resource discovery-- e.g. “Closest gas station”• Digital Battlefield• Transportation (taxi, courier, emergency response, municipal

transportation) • Supply Chain Management, logistics• Context-awareness, augmented-reality• Location- or Mobile-Ecommerce and Marketing• Air traffic control (www.faa.gov/freeflight)• Mobile workforce management

Currently built in an ad hoc fashion