Detection, Estimation, and Modulation Theory: Radar-Sonar Signal Processing and Gaussian Signals in Noise
IrisNet: an internet-scale architecture for multimedia sensors
Proceedings of the 13th annual ACM international conference on Multimedia
Are GSM Phones THE Solution for Localization?
WMCSA '06 Proceedings of the Seventh IEEE Workshop on Mobile Computing Systems & Applications
Surface street traffic estimation
Proceedings of the 5th international conference on Mobile systems, applications and services
Virtual trip lines for distributed privacy-preserving traffic monitoring
Proceedings of the 6th international conference on Mobile systems, applications, and services
The pothole patrol: using a mobile sensor network for road surface monitoring
Proceedings of the 6th international conference on Mobile systems, applications, and services
Nericell: rich monitoring of road and traffic conditions using mobile smartphones
Proceedings of the 6th ACM conference on Embedded network sensor systems
Assignment Problems
VTrack: accurate, energy-aware road traffic delay estimation using mobile phones
Proceedings of the 7th ACM Conference on Embedded Networked Sensor Systems
Finding available parking spaces made easy
Proceedings of the 6th International Workshop on Foundations of Mobile Computing
Short paper: PEPSI---privacy-enhanced participatory sensing infrastructure
Proceedings of the fourth ACM conference on Wireless network security
SignalGuru: leveraging mobile phones for collaborative traffic signal schedule advisory
MobiSys '11 Proceedings of the 9th international conference on Mobile systems, applications, and services
AccuLoc: practical localization of performance measurements in 3G networks
MobiSys '11 Proceedings of the 9th international conference on Mobile systems, applications, and services
Review: From wireless sensor networks towards cyber physical systems
Pervasive and Mobile Computing
Proceedings of the 19th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems
Opportunistically assisted parking service discovery: Now it helps, now it does not
Pervasive and Mobile Computing
Preserving query privacy in urban sensing systems
ICDCN'12 Proceedings of the 13th international conference on Distributed Computing and Networking
ScanTraffic: smart camera network for traffic information collection
EWSN'12 Proceedings of the 9th European conference on Wireless Sensor Networks
Advancing the state of mobile cloud computing
Proceedings of the third ACM workshop on Mobile cloud computing and services
Helping mobile apps bootstrap with fewer users
Proceedings of the 2012 ACM Conference on Ubiquitous Computing
Pricing of parking for congestion reduction
Proceedings of the 20th International Conference on Advances in Geographic Information Systems
Lowering the barriers to large-scale mobile crowdsensing
Proceedings of the 14th Workshop on Mobile Computing Systems and Applications
CrowdAtlas: self-updating maps for cloud and personal use
Proceeding of the 11th annual international conference on Mobile systems, applications, and services
Proceedings of the 2013 ACM conference on Pervasive and ubiquitous computing adjunct publication
ParkSense: a smartphone based sensing system for on-street parking
Proceedings of the 19th annual international conference on Mobile computing & networking
A mobile crowdsensing system enhanced by cloud-based social networking services
Proceedings of the First International Workshop on Middleware for Cloud-enabled Sensing
How to build vehicular ad-hoc networks on smartphones
Journal of Systems Architecture: the EUROMICRO Journal
Finding available parking spaces made easy
Ad Hoc Networks
An intelligent driver location system for smart parking
Expert Systems with Applications: An International Journal
Sharing with caution: Managing parking spaces in vehicular networks
Mobile Information Systems
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Urban street-parking availability statistics are challenging to obtain in real-time but would greatly benefit society by reducing traffic congestion. In this paper we present the design, implementation and evaluation of ParkNet, a mobile system comprising vehicles that collect parking space occupancy information while driving by. Each ParkNet vehicle is equipped with a GPS receiver and a passenger-side-facing ultrasonic range-finder to determine parking spot occupancy. The data is aggregated at a central server, which builds a real-time map of parking availability and could provide this information to clients that query the system in search of parking. Creating a spot-accurate map of parking availability challenges GPS location accuracy limits. To address this need, we have devised an environmental fingerprinting approach to achieve improved location accuracy. Based on 500 miles of road-side parking data collected over 2 months, we found that parking spot counts are 95% accurate and occupancy maps can achieve over 90% accuracy. Finally, we quantify the amount of sensors needed to provide adequate coverage in a city. Using extensive GPS traces from over 500 San Francisco taxicabs, we show that if ParkNet were deployed in city taxicabs, the resulting mobile sensors would provide adequate coverage and be more cost-effective by an estimated factor of roughly 10-15 when compared to a sensor network with a dedicated sensor at every parking space, as is currently being tested in San Francisco.