Date Added: Apr 2010
As the mobile devices with positioning function, such as GPS phones, become more and more popular, people now are able to know their locations easily. Based on these location data, various location-based services are provided on the Web and shown to be quite attractive to the users. For example, a bunch of outdoor sports forums have emerged to provide various geo-related Web services. By using these services, the forum users can upload and share their outdoor sports (such as bicycle riding) trajectories with other users. In this way, they can conveniently manage their own outdoor sports trajectories and also share them with other outdoor sports fans.