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Web-Enhanced GPS
February 1, 2005
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Authors
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Ramaswamy Hariharan
John Krumm
Eric Horvitz
Publication Type
TechReport
Pages
10
Number
MSR-TR-2005-16
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Abstract
Related Info
Abstract
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 locationtagged data already available on the Web which can be easily used to create compelling locationaware applications with almost no deployment cost. Such tagged data can be used directly in
applications as well as to provide evidence in models of ac-tivity. We describe three applications
that take advantage of existing Web data combined with location measurements from a GPS
receiver. The first applica-tion, “Pinpoint Search―, finds web pages of nearby places based
on GPS coor-dinates, 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 coordi-nates. 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.
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