Geofence是什么

1）Geofence是什么

According to wikipedia, Geofence（也称地理围栏）, “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. Custom-digitized geofences are also in use.

 

2） Geofence可以用来做什么呢？

Geofencing, used with child location services, can notify parents when a child leaves a designated area.

当小孩离开预设的范围时，可以触发某个事件，比如发短信或者邮件告警。

These geo-fences when crossed by an equipped vehicle or person can trigger a warning to the user or operator via SMS or Email.

 

3）如何实现

A)

一种方式是采用别个写好的sdk，比如location-labs的sdk，包括android和iOS版本：

http://geofence.locationlabs.com/code.html

 

B)

一种方式就是自己实现相应的功能。

iOS5已经内置对Geofencinig的支持，

比如调用 startMonitoringForRegion:desiredAccuracy: method of your CLLocationManager object.

android通过调用 LocationManager里面的 requestLocationUpdates 等函数。

 

自己实现，也不复杂。

 

4）参考资料

 还有些Geolocation相关的API，参见： 5 Geolocation APIs You May Not Have Heard Of