iPhone定位方法
我一直想知道iPhone如何根据wifi确定位置,因为我想将此功能集成到我的java应用程序中。
当我对我的 IP 进行位置检查时,它会将我一路带到其他邻居...但是当我使用 iPhone 的位置功能时,它也指向我。 (且 GPS 已关闭)
iPhone 如何确定位置?因为我知道它没有使用 IP 位置。
I have been wondering how the iPhone determines location based on wifi, because I want to integrate this functionality into a java app of mine.
When I run a location check on my ip, it throws me all the way into some other neighborhood... But when I use my iPhone's location feature, it points right too me. (and GPS is turned off)
How does the iPhone determine location? Because I know it's not using an ip location.
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它使用 wifi 接入点数据库。请参阅:http://skyhookwireless.com/,特别是http://www.skyhookwireless.com/press/skyhookapple.php。
It uses a wifi access point database. See: http://skyhookwireless.com/ and specifically http://www.skyhookwireless.com/press/skyhookapple.php.
它使用基于已知 WiFi 接入点的三角测量方案。当它第一次宣布时,我听到了 Skyhook Wireless 这个名字,所以 iPhone 可能正在使用他们的位置数据库。
It's using a triangulation scheme based off of known wifi access points. When this was first announced, I heard the name Skyhook Wireless thrown around, so it's possible that the iPhone is using their databases for location.
蜂窝塔三角测量?它可以看到邻近的 GSM 天线并了解相对信号强度。这可以提供一个很好的估计
Cell tower triangulation? It can see the neighbouring GSM antennas and knows the relative signal strengths. This allows a pretty good estimate