The stick-e note architecture: extending the interface beyond the user
Proceedings of the 2nd international conference on Intelligent user interfaces
Cyberguide: a mobile context-aware tour guide
Wireless Networks - Special issue: mobile computing and networking: selected papers from MobiCom '96
Calibration-Free Augmented Reality
IEEE Transactions on Visualization and Computer Graphics
comMotion: a context-aware communication system
CHI '99 Extended Abstracts on Human Factors in Computing Systems
ISWC '97 Proceedings of the 1st IEEE International Symposium on Wearable Computers
A natural wayfinding exploiting photos in pedestrian navigation systems
Proceedings of the 8th conference on Human-computer interaction with mobile devices and services
Exploiting real world knowledge in ubiquitous applications
Personal and Ubiquitous Computing
A critical evaluation of location based services and their potential
Journal of Location Based Services
Daily Routine Classification from Mobile Phone Data
MLMI '08 Proceedings of the 5th international workshop on Machine Learning for Multimodal Interaction
SerPens: a tool for semantically enriched location information on personal devices
BodyNets '08 Proceedings of the ICST 3rd international conference on Body area networks
Identifying Meaningful Places: The Non-parametric Way
Pervasive '08 Proceedings of the 6th International Conference on Pervasive Computing
Location-based activity recognition using relational Markov networks
IJCAI'05 Proceedings of the 19th international joint conference on Artificial intelligence
Inference attacks on location tracks
PERVASIVE'07 Proceedings of the 5th international conference on Pervasive computing
A user's perspective of design for context-awareness
Proceedings of the 13th international conference on Ubiquitous computing
Mobility detection using everyday GSM traces
UbiComp'06 Proceedings of the 8th international conference on Ubiquitous Computing
Web-based enrichment of bike sensor data for automatic geo-annotation
Proceedings of the Second ACM SIGSPATIAL International Workshop on Crowdsourced and Volunteered Geographic Information
Automatic GEO-MASHUP generation of outdoor activities
Proceedings of International Conference on Advances in Mobile Computing & Multimedia
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Location-based services like reminders, electronic graffiti, and tourist guides normally require a custom, location-sensitive database that must be custom-tailored for the application at hand. This deployment cost reduces the initial appeal of such services. However, there is much location-tagged data already available on the Web which can be easily used to create compelling location-aware applications with almost no deployment cost. Such tagged data can be used directly in applications as well as to provide evidence in models of activity. We describe three applications that take advantage of existing Web data combined with location measurements from a GPS receiver. The first application, “Pinpoint Search”, finds web pages of nearby places based on GPS coordinates, queries from a Web mapping service, and general Web searches. The second application, “XRay”, uses the mapping service to find businesses in a building by pointing a GPS-equipped electronic compass at the building. The third application is called “Travelogue”, and it builds a map and clickable points of interest to help automatically annotate a trip based on GPS coordinates. Finally, we discuss the use of Web-based data as rich sources of evidence for probabilistic models of a user's activity, including a means for interpreting the explanation for the loss of Web signals as users enter structures.