| 摘要 |
Many mobile devices such as smart phones can generate content ranging from text and audio, to images and videos that are taken with their cameras. These devices are also equipped with wireless radios and magnetometers that can be used to obtain position and orientation information. It is possible to allow the user of the mobile phone to add the position and orientation information of the mobile and date/time to the content that the mobile generates. Thus, emails, Short Message Service (SMS) messages, blog entries, audio recordings, and pictures/video that are generated with the mobile can be geotagged with the mobile's position and orientation, as well as the date and time. This information can then be used by a location-based contextual advertising server to provide more relevant on-line ads.
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