本文深入探讨了如何通过计算位置的精度来评估定位系统的准确性，采用68%置信圈的概念进行解释，并强调了实际应用中精度评估的复杂性。文中还特别指出，该精度仅涉及水平方向，不涵盖方向、速度或高度等其他因素。
Get the estimated accuracy of this location, in meters.
We define accuracy as the radius of 68% confidence. In other words, if you draw a circle centered at this location's latitude and longitude, and with a radius equal to the accuracy, then there is a 68% probability that the true location is inside the circle.
In statistical terms, it is assumed that location errors are random with a normal distribution, so the 68% confidence circle represents one standard deviation. Note that in practice, location errors do not always follow such a simple distribution.
This accuracy estimation is only concerned with horizontal accuracy, and does not indicate the accuracy of bearing, velocity or altitude if those are included in this Location.
If this location does not have an accuracy, then 0.0 is returned. All locations generated by the LocationManager include an accuracy.
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