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A Moving-Objects Datablade. Ouri Wolfson University of Illinois, Chicago [email protected]. 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 - PowerPoint PPT Presentation
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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
