QGeoPositionInfoSource：系统默认的“位置数据源”是什么以及在哪里？
以下引用来自此链接： http://apidocs.meego.com /1.2-preview/qtmobility/qgeopositioninfosource.html#createDefaultSource
创建并返回位置源 与给定的父 读取 系统默认的来源 位置数据，或带有 最高可用优先级。
系统默认的“位置数据源”是什么以及在哪里？有什么例子吗？ 我需要阅读什么才能理解这些概念？
The following quote is from this link: http://apidocs.meego.com/1.2-preview/qtmobility/qgeopositioninfosource.html#createDefaultSource
Creates and returns a position source
with the given parent that reads from
the system's default sources of
location data, or the plugin with the
highest available priority.
What and where are the system's default "sources of location data"? Any examples?
And what do I need to read to understand these concepts?
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默认来源取决于设备。
至于关于来源可能是什么的问题，这里是来自forum.nokia有关symbian手机的文档的摘录，尽管这在参考其他设备和平台以及
基于GPS的情况下大多是正确的：它可以提供精确度为 10 至 30 米的位置估计。根据实际技术和 GPS 模块的状态，首次定位时间从几秒到几分钟不等。到下一次修复的时间通常为 1 秒。它可能无法在室内工作。进行位置估计的GPS模块可以驻留在终端的内部（例如集成GPS）或外部（例如蓝牙GPS）。
辅助 GPS：辅助 GPS 技术通过从辅助服务器获取辅助数据来提高性能（即首次定位时间和灵敏度）。手机从无线网络接收辅助数据。根据运营商和订阅的不同，最终用户可能需要付费才能接收辅助数据。
基于网络：它可以提供精确度从百米到几千米的位置估计。首次定位时间和下次定位时间通常在 10 秒之内。它也适用于室内。通常需要运营商的支持。
The default source depends on the Device.
As to the question regarding what the sources might be , here is an extract from forum.nokia documentation regarding symbian phones , although this is mostly true in reference to other devices and platforms as well
GPS based: It can provide location estimation with accuracy from 10 to 30 meters. Depending on the actual technology and the state of GPS module, time to first fix varies from several seconds to minutes. Time to next fix is normally 1 second. It may not work indoor. The GPS module, which makes location estimation, may reside internally (e.g. integrated GPS) or externally (e.g. Bluetooth GPS) of the terminal.
Assisted GPS: Assisted GPS technology improves performance (i.e. time to first fix and sensitivity) by acquiring assistant data from an assistance server. The mobile phone receives the assistant data from wireless network. Depends on the operator and subscription, end user may have to pay for receiving assistant data.
Network based: It can provide location estimation with accuracy from a hundred meter to several kilometers. Time to first fix and time to next fix is normally within 10 seconds. It works also indoor. It normally requires support from operator.