iPhone 和数据地理定位精度
我想开发一个 iPhone 应用程序，必须将用户定位在博物馆中，然后弹出一些有关他正在查看的雕塑的有用信息。
因此，我想到了这些问题：
经度和纬度值的准确度如何？因为我想为博物馆中的每个地方提供这两个值，以便对它们进行定位。
如何在知道经度和纬度的情况下设置以米为单位（20 米的人造丝）的“误差范围”距离，以便我能够检测到用户的存在？
谢谢您，
问候。
I'd like to develop an iPhone app that must that locate the user in a museum then popups some useful information about the sculpture he is looking at.
Thus, these questions came to my mind:
How accurate are the longitude and the latitude values ? Because I want to give to each place in the museum this couple of values so that they will be located.
How can set an "error marge" distance in meters (rayon of 20 meters) knowing the longitude and latitude so that I can detect a users's presence?
Thank you,
Regards.
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评论（3）
干脆忘记它吧。即使在室外条件下，GPS 精度也不可靠。即使 iPhone GPS 声称它达到了“米”所需的精度，但事实上，大多数时候，它的精度比这要差得多。此外，您向设备请求的精度越高，所需的电池和 CPU 就越多。换句话说，除非一种新的地理定位技术取代当前基于卫星的地理定位技术，否则“博物馆”GPS应用不可能成为现实。
另一方面，您可以探索基于摄像头的更准确的替代方案，例如 QR-Code、图像识别（即 Google Google）等。这些肯定会给您在建筑物内提供更高水平的准确度，考虑到您想要做的就是检测您面前的东西。
我的2分钱。
Simply forget it. Even in outdoors conditions, GPS accuracy is not reliable. Even when the iPhone GPS says it is reaching "meter" desired accuracy, in fact, most of the time, it is way worse than that. Also, the highest accuracy you request from the device, the more battery and CPU it will take. In other words, a "museum" GPS application is impossible to become true until a new geo location technology replaces the current one based on satellites.
On the other hand, you could explore more accurate alternatives based on the camera, like QR-Code, image recognition (i.e. Google Googles) and so on. These will certainly give you a much higher level of accuracy inside a building, consider that all you want to do is to detect what is in front of you.
My 2 cents.
许多博物馆都有屋顶或较高楼层，良好的 GPS 信号无法穿透这些楼层，因此您可能无法获得比它们位于建筑物或附近的事实更高的准确度。
如果你在户外博物馆，可以清楚地看到广阔的天空（以及 GPS 卫星），那么你的运气可能会更好
Many museums will have a roof or upper floors that a good GPS signal will not penetrate, so you might not get any more accuracy than the fact they are in the building or neighborhood.
You may have better luck in an outdoor museum with a clear view of a lot of open sky (and thus GPS satellites)
在普通建筑物内，您不会收到 GPS 信号（除非您靠近窗户）。
如果您所在的建筑物有玻璃天花板，则可能可以获得 GPS 定位。
从单元格三角测量中，您也不会获得有用的位置信息。
在室外，这些值非常准确，最多有 1-2 米的误差。
Inside a normal building you will not get a GPS signal(unless you are close to a window).
If you have a building with glass ceiling it might be possible to get a GPS fix.
From cell triangulation you will not get useful positional information either.
outside, these values are pretty accurate 1-2 meters error at most.