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geofence
A geo-fence is a virtual perimeter for a real-world geographic area. A geo-fence could be dynamically generated—as in a radius around a store or point location, or a geo-fence can be a predefined set of boundaries, like school attendance zones or neighborhood boundaries.
The process of using a geo-fence is called geo-fencing, and one example of usage involves a location-aware device of a location-based service (LBS) user entering or exiting a geo-fence. This activity could trigger an alert to the device's user as well as messaging to the geo-fence operator. This info, which could contain the location of the device, could be sent to a mobile telephone or an email account.
==History==
Custom-digitized geofences have been in use since at least 2002 for multiple online mapping applications since their first appearance in research literature by Munson and Gupta. The term geofence itself is even older.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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