iPhone CLLocation 实践中的典型时间和水平精度
我想知道是否有人对 iPhone 查找位置的能力进行了彻底的实证测试。显然，性能和准确性将取决于所在区域的类型（城市、郊区、偏远）。
刚刚从模拟器中进行测试，我得到的水平精度为 <<几秒钟内 100 米（98 米）。我相信这是因为它使用的是 WiFi。
但是，出于用户体验的目的，使用 EDGE 或 GPS（假设两者都可用）获得这种精度的速度有多快？人口密集的城市地区与郊区的时间安排是否有所不同？
如果能就此发布一些实证结果，那就太好了，这样应用程序就可以相应地修改其用户体验。
I'm wondering if anybody has done thorough empirical testing of the iPhone's ability to find its location. Obviously the performance and accuracy will depend on the type of area one is in (urban vs suburban vs remote).
Just testing from the Simulator, I get a horizontalAccuracy of < 100 meters (98 meters) in a few seconds. I believe it is because it's using WiFi.
But, for user experience purposes, how fast would it be to get this kind of accuracy using EDGE or GPS (assuming both are available)? Does the timing vary in very dense urban areas vs suburban?
It would be great it there were some empirical results published on this so that apps could modify their user experience accordingly.
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模拟器在延迟几分钟后才发送一个带有 Apple 总部坐标的事件。
The simulator just sends one event with the coordinates of Apple's headquarters after a few minutes delay.
iPhone 型号之间存在精度差异，无论是使用“真正的”GPS、Wi-Fi 三角测量还是手机信号塔定位，以及天空覆盖范围和使用 GPS 时看到的特定卫星的问题，例如以及您等待多长时间。
实际上，我所看到的范围是从我在电梯（法拉第笼）中时的无限（或者可能是地球的直径）到当我从汽车的前部走到后部时告诉我的范围。
There is a difference in accuracy between models of iPhone, in whether "real" GPS, or wifi triangulation, or cell tower location are being used, as well as issues from sky coverage and the particular satellites in view when GPS is being used, as well as how long you wait.
In practice, the range I've seen is from infinite (or maybe the diameter of the planet) when I'm in an elevator (Faraday cage), to telling me when I walk from the front to the back of my car.