该博客介绍了如何估计地理位置的精度，以68%的置信度定义为误差的半径，即在一个以该位置为中心，半径等于精度值的圆内，真实位置有68%的概率位于其中。它假设位置误差符合正态分布，并指出实际上误差并不总是如此简单。此外，说明了这个精度估计仅关注水平精度，不涉及方向、速度或海拔的准确性。
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.
原文：http://www.cnblogs.com/yeahgis/p/4838364.html
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