The Cricket location-support system
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
Accuracy characterization for metropolitan-scale Wi-Fi localization
Proceedings of the 3rd international conference on Mobile systems, applications, and services
Self-management in chaotic wireless deployments
Proceedings of the 11th annual international conference on Mobile computing and networking
Place lab: device positioning using radio beacons in the wild
PERVASIVE'05 Proceedings of the Third international conference on Pervasive Computing
Integrating intra and extra gestures into a mobile and multimodal shopping assistant
PERVASIVE'05 Proceedings of the Third international conference on Pervasive Computing
Position estimation of wireless access point using directional antennas
LoCA'05 Proceedings of the First international conference on Location- and Context-Awareness
Self-mapping in 802.11 location systems
UbiComp'05 Proceedings of the 7th international conference on Ubiquitous Computing
Access Point Localization Using Local Signal Strength Gradient
PAM '09 Proceedings of the 10th International Conference on Passive and Active Network Measurement
Virtual WiFi network database construction for positioning services
CFI '09 Proceedings of the 4th International Conference on Future Internet Technologies
Bootstrapping a location service through geocoded postal addresses
LoCA'07 Proceedings of the 3rd international conference on Location-and context-awareness
Signal dragging: effects of terminal movement on war-driving in CDMA/WCDMA networks
LoCA'07 Proceedings of the 3rd international conference on Location-and context-awareness
Site-specific RSS signature modeling for WiFi localization
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Accuracy characterization of cell tower localization
Proceedings of the 12th ACM international conference on Ubiquitous computing
Mobile location tracking in metro areas: malnets and others
Proceedings of the 17th ACM conference on Computer and communications security
Proceedings of the 8th International Conference on Advances in Mobile Computing and Multimedia
A study on the security, the performance and the penetration of Wi-Fi networks in a Greek urban area
WISTP'11 Proceedings of the 5th IFIP WG 11.2 international conference on Information security theory and practice: security and privacy of mobile devices in wireless communication
Autonomous construction of a WiFi access point map using multidimensional scaling
Pervasive'11 Proceedings of the 9th international conference on Pervasive computing
Smart Routers for Cross-Layer Integrated Mobility and Service Management in Mobile IPv6 Systems
Wireless Personal Communications: An International Journal
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Many pervasive-computing applications depend on knowledge of user location. Because most current location-sensing techniques work only either indoors or outdoors, researchers have started using 802.11 beacon frames from access points (APs) to provide broader coverage. To use 802.11 beacons, they need to know AP locations. Because the actual locations are often unavailable, they use estimated locations from war driving. But these estimated locations may be different from actual locations. In this paper, we analyzed the errors in these estimates and the effect of these errors on other applications that depend on them. We found that the estimated AP locations have a median error of 32 meters. We considered the error in tracking user positions both indoors and outdoors. Using actual AP locations, we could improve the accuracy as much as 70% for indoors and 59% for outdoors. We also analyzed the effect of using estimated AP locations in computing AP coverage range and estimating interference among APs. The coverage range appeared to be shorter and the interference appeared to be more severe than in reality.